Earnings release
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Nexa Resources S.A. Condensed consolidated interim financial statements (Unaudited) at and for the three and nine-month periods ended on September 30, 2026
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Contents Condensed consolidated interim financial statements Condensed consolidated interim income statement 3 Condensed consolidated interim statement of comprehensive income 4 Condensed consolidated interim balance sheet 5 Condensed consolidated interim statement of cash flows 6 Condensed consolidated interim statement of changes in shareholders’ equity 7 Notes to the condensed consolidated interim financial statements 1 General information 9 2 Information by business segment 12 3 Basis of preparation of the condensed consolidated interim financial statements 15 4 Net revenues 16 5 Expenses by nature 17 6 Other income and expenses, net 18 7 Net financial results 19 8 Current and deferred income tax 20 9 Financial instruments 23 10 Other financial instruments 24 11 Inventory 26 12 Other assets and other liabilities 27 13 Property, plant and equipment 28 14 Intangible assets 29 15 Right-of-use assets and lease liabilities 29 16 Loans and financings 30 17 Asset retirement, restoration and environmental obligations 32 18 Impairment of long-lived assets 32 19 Long-term commitments 34 20 Events after the reporting period 35
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Nexa Resources S.A. Condensed consolidated interim income statement Unaudited Periods ended on September 30 All amounts in thousands of US Dollars Bookmark Income statement Three-month period ended Nine-month period ended Note 2026 2025 2026 2025 Net revenues 4 937,131 763,515 2,733,387 2,099,052 Cost of sales 5 (692,605) (609,555) (1,959,552) (1,685,991) Gross profit 244,526 153,960 773,835 413,061 Operating expenses Selling, general and administrative 5 (44,658) (37,488) (128,231) (105,256) Mineral exploration and project evaluation 5 (21,918) (22,072) (55,845) (55,135) Impairment (loss) reversal of long-lived assets 18 (123,966) 106,495 (123,146) 104,216 Other income and expenses, net 6 (34,276) (22,981) (63,382) (65,081) (224,818) 23,954 (370,604) (121,256) Operating income 19,708 177,914 403,231 291,805 Results from associates’ equity Share in the results of associates 6,627 5,760 18,904 15,063 6,627 5,760 18,904 15,063 Net financial results 7 Financial income 6,094 7,028 16,105 17,060 Financial expenses (65,358) (62,119) (174,137) (186,173) Other financial items, net 4,222 9,555 84,872 95,116 (55,042) (45,536) (73,160) (73,997) Income (loss) before tax (28,707) 138,138 348,975 232,871 Income tax (expense) benefit 8 (a) (18,608) (37,990) (180,367) (90,706) Net income (loss) for the period (47,315) 100,148 168,608 142,165 Attributable to NEXA's shareholders (62,743) 69,340 95,168 82,272 Attributable to non-controlling interests 15,428 30,808 73,440 59,893 Net income (loss) for the period (47,315) 100,148 168,608 142,165 Weighted average number of outstanding shares – in thousands 132,439 132,439 132,439 132,439 Basic and diluted (losses) earnings per share – USD (0.47) 0.52 0.72 0.62 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 3 of 35
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Nexa Resources S.A. Condensed consolidated interim statement of comprehensive income Unaudited Periods ended on September 30 All amounts in thousands of US Dollars bookmark Statement of comprehensive income Three-month period ended Nine-month period ended Note 2026 2025 2026 2025 Net income (loss) for the period (47,315) 100,148 168,608 142,165 Other comprehensive income (loss), net of income tax - items that can be reclassified to the incomestatement Cash flow hedge accounting 10 (c) (1,623) (293) 5,747 1,775 Deferred income tax 8 (b) 531 316 (1,633) (825) Translation adjustment of foreign subsidiaries (212) 18,167 59,532 101,598 (1,304) 18,190 63,646 102,548 Other comprehensive income (loss), net of income tax - items that cannot be reclassified to theincome statement Changes in fair value of financial liabilities related to changes in the Company’s own credit risk 16 (c) 536 (483) (406) (322) Deferred income tax 8 (b) (182) 164 137 108 Changes in fair value of investments in equity instruments 626 1,981 94 (430) 980 1,662 (175) (644) Other comprehensive income (loss) for the period, net of income tax (324) 19,852 63,471 101,904 Total comprehensive income (loss) for the period (47,639) 120,000 232,079 244,069 Attributable to NEXA’s shareholders (63,069) 87,852 155,212 176,181 Attributable to non-controlling interests 15,430 32,148 76,867 67,888 Total comprehensive income (loss) for the period (47,639) 120,000 232,079 244,069 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 4 of 35
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Nexa Resources S.A. Condensed consolidated interim balance sheet All amounts in thousands of US Dollars Bookmark Balance ookm September 30, December 31, Note 2026 2025 Assets Current assets Cash and cash equivalents 404,501 515,871 Financial investments 10,602 5,687 Other financial instruments 10 (a) 17,561 18,643 Trade accounts receivables 213,197 228,588 Inventory 11 564,101 414,395 Recoverable income tax 4,955 11,812 Other assets 12 (a) 120,986 77,225 1,335,903 1,272,221 Non-current assets Investments in equity instruments 5,313 5,219 Other financial instruments 10 (a) 16,152 18,124 Deferred income tax 8 (b) 355,555 307,293 Recoverable income tax 7,209 6,592 Other assets 12 (a) 318,775 211,427 Investments in associates 34,223 32,274 Property, plant and equipment 13 (a) 2,501,784 2,433,672 Intangible assets 14 (a) 842,400 877,928 Right-of-use assets 15 (a) 121,749 110,167 4,203,160 4,002,696 Total assets 5,539,063 5,274,917 Liabilities and shareholders’ equity Current liabilities Loans and financings 16 (a) 130,356 55,415 Lease liabilities 15 (b) 46,821 45,516 Other financial instruments 10 (a) 34,576 32,233 Trade payables 523,866 500,025 Confirming payables 380,708 415,388 Dividends payable 24,336 26,918 Asset retirement, restoration and environmental obligations 17 (a) 72,753 39,326 Provisions 26,596 23,558 Contractual obligations 12,965 18,166 Salaries and payroll charges 113,454 83,597 Tax liabilities 109,486 83,368 Other liabilities 12 (b) 148,526 143,834 1,624,443 1,467,344 Non-current liabilities Loans and financings 16 (a) 1,622,124 1,650,569 Lease liabilities 15 (b) 92,429 75,618 Other financial instruments 10 (a) 69,906 71,660 Asset retirement, restoration and environmental obligations 17 (a) 264,134 281,107 Tax liabilities 46,045 96,333 Provisions 34,187 29,913 Deferred income tax 8 (b) 165,724 177,945 Contractual obligations 106,970 72,596 Other liabilities 12 (b) 59,483 62,269 2,461,002 2,518,010 Total liabilities 4,085,445 3,985,354 Shareholders’ equity Attributable to NEXA’s shareholders 1,140,646 1,002,934 Attributable to non-controlling interests 312,972 286,629 1,453,618 1,289,563 Total liabilities and shareholders’ equity 5,539,063 5,274,917 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 5 of 35
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Nexa Resources S.A. Condensed consolidated interim statement of cash flows Unaudited Periods ended on September 30 All amounts in thousands of US Dollars Cash Flow Three-month period ended Nine-month period ended Note 2026 2025 2026 2025 Cash flows from operating activities Income (loss) before tax (28,707) 138,138 348,975 232,871 Depreciation and amortization 5 89,780 81,538 253,466 223,914 Impairment loss (reversal) of long-lived assets 18 123,966 (106,495) 123,146 (104,216) Share in the results of associates (6,627) (5,760) (18,904) (15,063) Interest, foreign exchange and other financial effects 60,797 68,049 117,522 153,605 Loss on sale and write-off of property, plant and equipment 6 1,833 998 4,504 683 Changes in provisions and other assets impairments 3,277 6,057 9,311 25,752 Changes in fair value of loans and financings 16 (c) (213) (427) (960) (1,828) Debt modification gain 16 (c) - - (203) - Loss on bonds repurchase 16 (c) - - - 1,905 Changes in fair value of derivative financial instruments 10 (c) 511 (2,410) (9,138) (7,437) Changes in fair value of energy forward contracts 10 (d) 825 (4,465) (574) (7,569) Changes in fair value of offtake agreement 10 (e) 18,265 5,806 40,380 20,125 Contractual obligations 50,852 24,637 50,852 24,637 Price cap realized in offtake agreement 10 (e) (8,329) (1,278) (17,858) (2,780) Decrease (increase) in assets Trade accounts receivables (41,637) (29,912) (7,940) (51,257) Inventory (84,586) (29,645) (145,929) (70,616) Other financial instruments (3,485) 2,015 (3,425) 5,370 Other assets (57,725) (3,982) (137,946) (90,810) Increase (decrease) in liabilities Trade payables 47,464 31,575 3,984 (34,492) Confirming payables 55,059 57,870 (52,502) 35,946 Other liabilities 27,243 (16,369) (79,149) (53,063) Cash provided by operating activities 248,563 215,940 477,612 285,677 Interest paid on loans and financings 16 (c) (19,429) (23,773) (85,691) (93,526) Interest paid on lease liabilities 15 (b) (2,744) (2,536) (7,895) (7,154) Premium paid on bonds repurchase - - - (15,046) Income tax paid (41,243) (22,098) (143,548) (85,816) Net cash provided by operating activities 185,147 167,533 240,478 84,135 Cash flows from investing activities Additions of property, plant and equipment 13 (a) (111,896) (89,963) (272,341) (226,955) Additions of intangible assets 14 (a) (5) (672) (3,220) (1,606) Net (purchases) sales of financial investments (1,654) 2,606 1,034 24,236 Payment for acquisition of subsidiary, net of cash acquired - - - 997 Proceeds from (payments for) the sale of property, plant and equipment (378) 311 (135) 1,325 Dividends received 1.1 (a) 7,630 6,061 18,852 16,160 Net cash used in investing activities (106,303) (81,657) (255,810) (185,843) Cash flows from financing activities New loans and financings 16 (c) - - 40,000 540,000 Debt issue costs - (31) - (4,902) Payments of loans and financings 16 (c) (9,755) (7,188) (27,304) (525,506) Payments of lease liabilities 15 (b) (13,445) (11,690) (40,011) (31,602) Dividends paid 1.1 (a) (13,537) (15,585) (54,305) (28,773) Effects of transactions with non-controlling interest in subsidiary - - - (11) Purchase of non-controlling interest shares - (502) - (502) Payments of share premium 1.1 (a) (17,500) - (17,500) (13,400) Capital contribution of non-controlling interest to subsidiary - - - 1,864 Net cash used in financing activities (54,237) (34,996) (99,120) (62,832) Foreign exchange effects on cash and cash equivalents 154 1,511 3,082 8,702 (Decrease) increase in cash and cash equivalents 24,761 52,391 (111,370) (155,838) Cash and cash equivalents at the beginning of the period 379,740 412,308 515,871 620,537 Cash and cash equivalents at the end of the period 404,501 464,699 404,501 464,699 Non-cash investing and financing transactions Additions to right-of-use assets 15 (a) (19,775) (13,914) (61,368) (45,164) Write-offs of property, plant and equipment 13 (a) 1,302 1,309 5,215 2,008 Write-offs of intangible assets 14 (a) 1,738 - 1,738 - Write-offs of right-of-use 15 (a) 1,067 - 2,930 - Derecognition of right-of-use 15 (a) - - 11,422 - Write-offs of asset retirement obligations 17 (a) - - 2,584 - Consolidation effect on subsidiary acquisition - - - 210 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 6 of 35
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Nexa Resources S.A. Condensed consolidated interim statement of changes in shareholders' equity Unaudited For the three-month periods ended on September 30 All amounts in thousands of US Dollars bookmark Changes in shareholder’s equity Capital Sharepremium Additionalpaid incapital Retainedearnings(cumulativedeficit) Accumulatedothercomprehensiveloss Total NEXA’sshareholders Non-controllinginterests Totalshareholders’equity At June 30, 2026 132,438 981,729 1,245,418 (949,940) (205,930) 1,203,715 305,831 1,509,546 Net income (loss) for the period - - - (62,743) - (62,743) 15,428 (47,315) Other comprehensive income (loss) for the period - - - - (326) (326) 2 (324) Total comprehensive income (loss) for the period - - - (62,743) (326) (63,069) 15,430 (47,639) Dividends distribution to non-controlling interests – note 1.1 (a) - - - - - - (8,289) (8,289) Total contributions by and distributions to shareholders - - - - - - (8,289) (8,289) At September 30, 2026 132,438 981,729 1,245,418 (1,012,683) (206,256) 1,140,646 312,972 1,453,618 Capital Sharepremium Additionalpaid incapital Retainedearnings(cumulativedeficit) Accumulatedothercomprehensiveloss Total NEXA’sshareholders Non-controllinginterests Totalshareholders’equity At June 30, 2025 132,438 999,229 1,245,418 (1,227,053) (260,168) 889,864 255,745 1,145,609 Net income for the period - - - 69,340 - 69,340 30,808 100,148 Other comprehensive income for the period - - - - 18,512 18,512 1,340 19,852 Total comprehensive income for the period - - - 69,340 18,512 87,852 32,148 120,000 Dividends distribution to non-controlling interests - - - - - - (9,702) (9,702) Purchase of non-controlling shares - - - (492) - (492) (10) (502) Total contributions by and distributions to shareholders - - - (492) - (492) (9,712) (10,204) At September 30, 2025 132,438 999,229 1,245,418 (1,158,205) (241,656) 977,224 278,181 1,255,405 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 7 of 35
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Nexa Resources S.A. Condensed consolidated interim statement of changes in shareholders' equity Unaudited For the nine-month periods ended on September 30 All amounts in thousands of US Dollars Capital Sharepremium Additionalpaid incapital Retainedearnings(cumulativedeficit) Accumulatedothercomprehensiveloss Total NEXA’sshareholders Non-controllinginterests Totalshareholders’equity At January 1, 2026 132,438 999,229 1,245,418 (1,107,851) (266,300) 1,002,934 286,629 1,289,563 Net income for the period - - - 95,168 - 95,168 73,440 168,608 Other comprehensive income for the period - - - - 60,044 60,044 3,427 63,471 Total comprehensive income for the period - - - 95,168 60,044 155,212 76,867 232,079 Dividends distribution to non-controlling interests – note 1.1 (a) - - - - - - (50,524) (50,524) Share premium distribution to NEXA’s shareholders – USD 0.13per share - note 1.1 (a) - (17,500) - - - (17,500) - (17,500) Total contributions by and distributions to shareholders - (17,500) - - - (17,500) (50,524) (68,024) At September 30, 2026 132,438 981,729 1,245,418 (1,012,683) (206,256) 1,140,646 312,972 1,453,618 Capital Sharepremium Additionalpaid incapital Retainedearnings(cumulativedeficit) Accumulatedothercomprehensiveloss Total NEXA’sshareholders Non-controllinginterests Totalshareholders’equity At January 1, 2025 132,438 1,012,629 1,245,418 (1,240,990) (335,565) 813,930 246,363 1,060,293 Net income for the period - - - 82,272 - 82,272 59,893 142,165 Other comprehensive income for the period - - - - 93,909 93,909 7,995 101,904 Total comprehensive income for the period - - - 82,272 93,909 176,181 67,888 244,069 Dividends distribution to non-controlling interests - - - - - - (36,908) (36,908) Capital contribution of non-controlling interest to subsidiary - - - - - - 1,864 1,864 Effects of transactions with non-controlling interest in subsidiary - - - 1,005 - 1,005 (1,016) (11) Share premium distribution to NEXA’s shareholders – USD0.10 per share - (13,400) - - - (13,400) - (13,400) Purchase of non-controlling shares - - - (492) - (492) (10) (502) Total contributions by and distributions to shareholders - (13,400) - 513 - (12,887) (36,070) (48,957) At September 30, 2025 132,438 999,229 1,245,418 (1,158,205) (241,656) 977,224 278,181 1,255,405 The accompanying notes are an integral part of these condensed consolidated interim financial statements. 8 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 1 General information Nexa Resources S.A. (“NEXA” or “Parent Company”) is a public limited liability company (société anonyme) incorporated and domiciled in the Grand Duchy of Luxembourg. Its shares are publicly traded on the New York Stock Exchange (“NYSE”). The Company’s registered office is located at 37A, Avenue J. F. Kennedy in the city of Luxembourg in the Grand Duchy of Luxembourg. NEXA and its subsidiaries (the “Company”) operate large-scale, mechanized underground and open pit mines, as well as smelters. The Company owns and operates three polymetallic mines in Peru and two polymetallic mines in Brazil. Additionally, the Company owns and operates a zinc smelter in Peru and two zinc smelters in Brazil. NEXA’s majority shareholder is Votorantim S.A. (“VSA”), which holds 64.68% of its equity. VSA is a Brazilian privately-owned industrialconglomerate that holds ownership interests in metal, steel, cement, and energy companies, among others. 1.1 Main events for the nine-month period ended on September 30, 2026 (a) Dividends distribution and share premium reimbursement NEXA On June 25, 2026, the Company's Annual General Meeting approved the reimbursement of share premium to shareholders in an aggregate amount of approximately USD 17,500, equivalent to USD 0.132136 per common share, in accordance with the dividend policy. The reimbursement was paid on August 7, 2026. In June 2025, the Company reimbursed share premium in the amount of USD 13,400. Nexa Peru On May 15, 2026, Nexa Peru approved dividends related to the prior year, totaling USD 100,000, payable in two installments of USD 50,000each, based on each shareholder’s ownership percentage as of the payment date. Nexa Cajamarquilla (Nexa CJM) is entitled to receive USD 82,432 based on its ownership interest, NEXA USD 179, and the non-controlling interests USD 17,389. The first installment was paid on June 16, 2026, resulting in payments of USD 41,216 to Nexa CJM, USD 85 to NEXA and USD 8,724 to the non-controlling interests, net of taxes. During the third quarter of 2026, Nexa Peru paid USD 54 of dividends related to prior periods to non-controlling interests. The amounts of USD 41,216 to Nexa CJM, USD 85 to NEXA and USD 8,026 to non-controlling interests, net of taxes, were paid on October 26, 2026, in accordance with the approved payment schedule (subsequent event). The outstanding balances of USD 496 to non-controlling interests are expected to be settled in the coming months. Pollarix During the first half of 2026, Pollarix approved dividend distributions related to prior periods totaling USD 31,281 (BRL 161,004), of which USD24,846 (BRL 127,883) was attributable to non-controlling interests and USD 6,435 (BRL 33,121) to Nexa BR. During the same period, dividend payments totaled USD 40,343 (BRL 210,614), of which USD 32,044 (BRL 167,288) was paid to non-controlling interests and USD 8,299 (BRL 43,326) to Nexa BR. On July 31, 2026, Pollarix paid previously approved dividends totaling USD 16,980 (BRL 87,198), of which USD 13,483 (BRL 69,260) was paid to non-controlling interests and USD 3,497 (BRL 17,938) to Nexa BR. The difference in the USD amounts reflects exchange rate fluctuationsbetween the approval and payment dates. 9 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated During the third quarter of 2026, Pollarix approved dividend distributions totaling USD 10,435 (BRL 53,610), of which USD 8,289 (BRL 42,582) was attributable to non-controlling interests and USD 2,146 (BRL 11,028) to Nexa BR. These dividends were paid on October 14, 2026 (subsequent event). As of September 30, 2026, dividends payable totaling USD 5,998 (BRL 31,072), comprising USD 4,764 (BRL 24,680) payables to non- controlling interests and USD 1,234 (BRL 6,392) payables to Nexa BR, remained outstanding in connection with dividends previously declared and approved. Enercan During the nine-month period ended September 30, 2026, Pollarix received USD 18,852 (BRL 94,262) in cash related to the additional dividends approved by Enercan’s Board of Directors on April 28, 2026. The remaining balance of USD 651 (BRL 3,374) is expected to be received by December 31, 2026. (b) Tax claim payments During the previous quarters of 2026, the Company made payments totaling USD 142,787 in connection with uncertain income tax positions in Peru, as described in note 8 (c). Of this amount USD 87,328 was recognized as “Tax claim payments” within “Other assets.” In the three-month period ended on September 30, 2026, the Company made an additional payment of USD 16,654 in connection with uncertain income tax positions in Peru related to the 2016-2017 tax periods, also recognized as “Tax claim payments” within “Other assets”, as explained in note 8 (c). (c) New loans and prepaid operations On March 4, 2026, the Company entered into an Export Prepayment Loan agreement (ACC”) for a principal amount of USD 40,000, at an annual interest rate of 4.69%. The loan originally had a six-month tenor, maturing on August 31, 2026, and was subsequently extended for an additional three months at an annual interest rate of 4.75%, therefore maturing on November 27, 2026. The loan is repayable in a single installment upon submission of the supporting export documentation. During the nine-month period ended September 30, 2026, the Company received customer advances totaling USD 62,353 under commercialagreements, comprising USD 11,193 from Nexa BR, USD 16,160 from Nexa CJM, and USD 35,000 under an addendum to an existing agreement for the sale of concentrates produced by Nexa Perú’s Cerro Lindo unit, all of which were received in September 2026. These amounts were recognized as “Other liabilities,” and the related revenue will be recognized as the corresponding performance obligations are satisfied upon delivery of the products, which is expected to occur within three months. For further details, refer to Note 12 (b). (d) Silver streaming agreement During the second quarter of 2026, Nexa UK achieved the cumulative delivery commitment of 19.5 million ounces established under the silverstreaming arrangement. Consequently, the percentage of silver contained in the concentrates produced by the Cerro Lindo mining unit subject to the streaming arrangement was reduced from 65% to 25%, in accordance with the contractual terms, effective from May 2026. Upon reaching the contractual threshold, the Company began accounting for the streaming arrangement based on the revised silver delivery percentage. The deferred revenue balance will continue to be recognized prospectively over the remaining term of the agreement. 10 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated Additionally, in September 2026, Nexa recognized a USD 50,852 reduction in revenue (September 30, 2025: USD 24,637) related to the annual remeasurement of the silver streaming agreement, reflecting higher long-term silver prices and updates to the Cerro Lindo life-of-mine plan, as well as USD 8,205 of interest accretion. Under the Company’s silver streaming accounting policy, changes in prices and the life of mine (“LOM”)resulting from updated mining plans are treated as variable consideration. Accordingly, previously recognized revenue was adjusted to reflect these updated assumptions, with a corresponding increase in deferred revenue. (e) Iran conflict impacts on the Company´s financial statements and operations Ongoing geopolitical tensions involving the United States, Israel, and Iran have significantly heightened security concerns and increased global economic uncertainty. In June 2026, the United States and Iran announced a Memorandum of Understanding intended to cease hostilities and support negotiations toward a broader resolution of the conflict. However, subsequent developments, including incidents affecting maritime navigation and regional security, resulted in renewed tensions and continued geopolitical uncertainty. As of the date of this report, the situation in the Middle East remains volatile, with ongoing risks to global trade routes, including the Strait of Hormuz and the Bab al-Mandab Strait, as wellas potential impacts on energy markets and broader macroeconomic conditions. Consequently, the geopolitical landscape remains uncertain. In this context, Nexa conducted an initial cross-functional assessment, incorporating inputs from Supply Chain, Market Intelligence, Commercial, and Strategic Planning, to monitor potential impacts on energy supply, logistics, and macroeconomic conditions, and to evaluate contingency measures for implementation, if necessary. As of the date of this report, the Company has not identified any material impacts on its operations, financial condition, or cash flows. However, the Company cannot predict the potential future impact of the conflict on its business and operation and continues to closely monitor the situation. (f) “El Niño” Climate Phenomenon impacts Management has been monitoring the evolution of weather conditions and their potential effects on the Company's operations and supply chain, including the supply of raw materials and other inputs, production, logistics, energy costs and availability, and the sale of concentrates and metalproducts, in connection with the potential effects of the El Niño climate phenomenon. Potential adverse effects associated with this phenomenon may include above-average rainfall, flooding, landslides and logistics disruptions in Peru, as well as below-average rainfall, water scarcity, wildfires and heat exposure in Brazil, which could affect mining, smelting and logistics activities and result in increased operating costs. As of September 30, 2026, Management had not identified any material impacts arising from these conditions on the Company's operations, supply chain, financial position, or results of operations. As a precautionary measure, and considering the possibility of adverse weather conditions affecting operations and logistics during the fourth quarter of 2026 and the first quarter of 2027, the Company has implemented actions to mitigate potential risks, including the acquisition of additional concentrate volumes to increase inventory levels and support operational continuity. Any potential impact resulting from significant changes in the conditions currently observed, including those affecting energy markets, operating costs, the integrity of critical infrastructure, and the continuity of logistics and operational activities, will continue to be monitored and, whenapplicable, reflected in the financial statements. 11 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (g) Agreement for the transfer of control of NEXA On August 27, 2026, Votorantim S.A. (“Votorantim”), the Company's controlling shareholder, entered into a definitive agreement with Boliden AB (“Boliden”) for the sale of its controlling stake in the Company. Under the terms of the agreement, Votorantim will transfer all of its shares in the Company to Boliden through a share-for-share exchange, receiving 0.250 newly issued Boliden common shares for each Nexa common share. Upon completion of the transaction, Boliden is expected to hold approximately 64.68% of the Company's total shares and voting rights andbecome the Company's controlling shareholder. Votorantim is expected to hold approximately 7% of Boliden's total shares and voting rights. As the transaction is being effected between shareholders, the Company will not receive any proceeds from the transaction. The transaction is subject to the satisfaction of customary conditions precedent, including shareholder and regulatory approvals, and is expected to be completed during the first quarter of 2027. In connection with the transaction, Boliden has agreed, subject to closing, to commence a voluntary cash tender offer to purchase all remainingoutstanding shares of the Company held by minority shareholders. Following completion of the transaction, Boliden will also commence mandatory tender offers for the remaining outstanding shares of certain of the Company's subsidiaries listed in Peru, as required under applicable Peruvian regulations. The offer price in such mandatory tender offers will be determined in accordance with applicable regulations, and the offers are expected to commence within six months following closing. Following completion, the Company is expected to remain a separate legal entity incorporated in Luxembourg, organized under the laws of Luxembourg, continue to be listed on the New York Stock Exchange (NYSE), and continue to report under the U.S. Securities Exchange Act of 1934. As of September 30, 2026, the transaction had not been completed, Votorantim remained the Company's controlling shareholder, and no accounting impacts related to the transaction had been recognized in these interim condensed consolidated financial statements. 2 Information by business segment Segment performance is assessed based on Adjusted EBITDA, since net financial results, comprising financial income and expenses and other financial items, and income tax are managed at the corporate level and are not allocated to operating segments. The Company defines Adjusted EBITDA as follows: net income (loss) for the year/period, adjusted by (i) share in the results of associates, depreciation and amortization, net financial results and income tax; (ii) addition of cash dividends received from associates; (iii) non-cash events and non-cash gains or losses that do not specifically reflect its operational performance for the specific period, such as: gain (loss) on sale ofinvestments; impairment and impairment reversals; gain (loss) on sale of long-lived assets; write-offs of long-lived assets; remeasurement in estimates of asset retirement obligations; and other restoration obligations; and (iv) pre-operating and ramp-up expenses incurred during the commissioning and ramp-up phases of greenfield projects. In addition, management may adjust the effect of certain types of transactions that in its judgments are (i) events that are non-recurring, unusual or infrequent, and (ii) other specific events that, by their nature and scope, do not reflect NEXA’s operational performance for the year/period. 12 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated The Adjusted EBITDA is derived from internal information prepared in accordance with the International Financial Reporting Standards (“IFRS Accounting Standards”) and based on accounting measurements and management reclassifications between income statement lines items, which are reconciled to the consolidated financial statements in the column “Adjustments”, as shown in the tables below. These adjustments include reclassifications of certain overhead costs and revenues from “Other income and expenses, net” to “Net Revenues, Cost of sales and/or Selling”, “General and administrative expenses”. The Company uses customary market terms for intersegment sales. The Company’s corporate headquarters expenses are allocated to theoperating segments to the extent they are included in the measures of performance used by the Chief operating decision maker (CODM). The presentation of segment results and reconciliation to income before income tax in the consolidated income statement is as follows: Three-month period ended September 30, 2026 Mining Smelting Intersegmentsales Adjustments Consolidated Net revenues 453,584 696,196 (217,837) 5,188 937,131 Cost of sales (271,155) (637,594) 217,837 (1,693) (692,605) Gross profit 182,429 58,602 - 3,495 244,526 Selling, general and administrative (21,627) (21,718) - (1,313) (44,658) Mineral exploration and project evaluation (20,338) (1,618) - 38 (21,918) Impairment loss of long-lived assets (31,061) (92,907) - 2 (123,966) Other income and expenses, net (28,144) (4,062) - (2,070) (34,276) Operating (loss) income 81,259 (61,703) - 152 19,708 Depreciation and amortization 63,207 26,446 - 127 89,780 Miscellaneous adjustments 91,123 100,216 - - 191,339 Adjusted EBITDA 235,589 64,959 - 279 300,827 Changes in fair value of offtake agreement – note 10 (e) / (i) (9,936) Impairment loss of long-lived assets – note 18 (123,966) Loss on sale and write-off of property, plant and equipment (1,833) Asset retirement obligations remeasurement estimate – 17 3,703 Changes in fair value of energy forward contracts – note 10 (d) / (ii) (824) Dividends received in cash – note 1.1 (a) (7,631) Remeasurement adjustment of streaming agreement – note 4 (ii) (50,852) Miscellaneous adjustments (191,339) Depreciation and amortization (89,780) Share in result of associate 6,627 Net financial results (55,042) Loss before income tax (28,707) 13 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated Three-month period ended September 30, 2025 Mining Smelting Intersegmentsales Adjustments Consolidated Net revenues 371,588 540,768 (169,556) 20,715 763,515 Cost of sales (236,293) (522,801) 169,556 (20,017) (609,555) Gross profit 135,295 17,967 - 698 153,960 Selling, general and administrative (17,902) (18,499) - (1,087) (37,488) Mineral exploration and project evaluation (20,059) (2,023) - 10 (22,072) Impairment loss of long-lived assets 106,495 - - - 106,495 Other income and expenses, net (21,522) (497) - (962) (22,981) Operating (loss) income 182,307 (3,052) - (1,341) 177,914 Depreciation and amortization 56,282 24,446 - 810 81,538 Miscellaneous adjustments (74,597) 1,225 - - (73,372) Adjusted EBITDA 163,992 22,619 - (531) 186,080 Changes in fair value of offtake agreement (4,528) Impairment reversal of long-lived assets 106,495 Loss on sale and write-off of property, plant and equipment (998) Asset retirement obligations remeasurement estimate (1,348) Changes in fair value of energy forward contracts 4,465 Other restoration obligations (16) Dividends received in cash (6,061) Remeasurement adjustment of streaming agreement (24,637) Miscellaneous adjustments 73,372 Depreciation and amortization (81,538) Share in result of associate 5,760 Net financial results (45,536) Income before income tax 138,138 Nine-month period ended September 30, 2026 Mining Smelting Intersegmentsales Adjustments Consolidated Net revenues 1,438,071 1,888,837 (602,517) 8,996 2,733,387 Cost of sales (820,658) (1,737,580) 602,517 (3,831) (1,959,552) Gross profit 617,413 151,257 - 5,165 773,835 Selling, general and administrative (63,268) (63,719) - (1,244) (128,231) Mineral exploration and project evaluation (52,409) (3,545) - 109 (55,845) Impairment loss of long-lived assets (30,239) (92,907) - - (123,146) Other income and expenses, net (57,528) (2,037) - (3,817) (63,382) Operating (loss) income 413,969 (10,951) - 213 403,231 Depreciation and amortization 167,571 85,708 - 187 253,466 Miscellaneous adjustments 105,050 107,632 - - 212,682 Adjusted EBITDA 686,590 182,389 - 400 869,379 Changes in fair value of offtake agreement - note 10 (e) / (i) (22,522) Impairment loss of long-lived assets - note 18 (123,146) Loss on sale and write-off of property, plant and equipment (4,504) Asset retirement obligations remeasurement estimate - notes 13 and 17 (a) 6,620 Changes in fair value of energy forward contracts - note 10 (d) / (ii) 574 Dividends received in cash – note 1.1 (a) (18,852) Remeasurement adjustment of streaming agreement – note 4 (ii) (50,852) Miscellaneous adjustments (212,682) Depreciation and amortization (253,466) Share in result of associate 18,904 Net financial results (73,160) Income before income tax 348,975 14 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated Nine-month period ended September 30, 2025 Mining Smelting Intersegmentsales Adjustments Consolidated Net revenues 1,038,146 1,483,823 (463,009) 40,092 2,099,052 Cost of sales (682,560) (1,424,019) 463,009 (42,421) (1,685,991) Gross profit 355,586 59,804 - (2,329) 413,061 Selling, general and administrative (51,915) (52,346) - (995) (105,256) Mineral exploration and project evaluation (51,511) (3,596) - (28) (55,135) Impairment loss of long-lived assets 104,216 - - - 104,216 Other income and expenses, net (60,994) (2,791) - (1,296) (65,081) Operating (loss) income 295,382 1,071 - (4,648) 291,805 Depreciation and amortization 147,689 71,433 - 4,792 223,914 Miscellaneous adjustments (50,556) 6,748 - - (43,808) Adjusted EBITDA 392,515 79,252 - 144 471,911 Changes in fair value of offtake agreement (17,345) Impairment reversal of long-lived assets 104,216 Loss on sale and write-off of property, plant and equipment (683) Asset retirement obligations remeasurement estimate (9,032) Changes in fair value of energy forward contracts 7,569 Other restoration obligations (120) Dividends received in cash (16,160) Remeasurement adjustment of streaming agreement (24,637) Miscellaneous adjustments 43,808 Depreciation and amortization (223,914) Share in result of associate 15,063 Net financial results (73,997) Income before income tax 232,871 bookmark (i) This amount represents the change in the fair value of the offtake agreement disclosed in note 10 (e), which is being measured at fair value through profit or loss (“FVTPL”). This change in fair value is a non-cash item and has not been considered in the Company’s Adjusted EBITDA calculation. (ii) This amount corresponds to the change in fair value and any adjustment of the energy surplus arising from electric energy purchase contracts of NEXA’s subsidiary, Pollarix and Nexa Energy Comercializadora de Energia Ltda, as disclosed in note 10 (d). This change in fair value is a non-cash item and has been excluded from the Company’s Adjusted EBITDA calculation. 3 Basis of preparation of the condensed consolidated interim financial statements These condensed consolidated interim financial statements as at and for the three and nine-month periods ended on September 30, 2026, have been prepared in accordance with the International Accounting Standard 34 Interim Financial Reporting (“IAS 34”) using the accountingprinciples consistent with the IFRS Accounting Standards, as issued by the International Accounting Standards Board (“IASB”). The Company made a voluntary election to present, as supplementary information, the condensed consolidated interim statement of cash flows for the three-month periods ended on September 30, 2026, and 2025. The Company is also presenting a condensed consolidated interim statement of changes in shareholders’ equity for the three-month periods ended on September 30, 2026, and 2025 in accordance with SEC Final Rule Release No. 33-10532, Disclosure Update and Simplification. These condensed consolidated interim financial statements do not include all disclosures required by the IFRS Accounting Standards for annual consolidated financial statements and accordingly, should be read in conjunction with the Company’s audited consolidated financial statements for the year ended on December 31, 2025, prepared in accordance with the IFRS Accounting Standards as issued by the IASB. 15 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated These condensed consolidated interim financial statements have been prepared on the basis of, and using the accounting policies, methods of computation and presentation consistent with those applied and disclosed in the Company’s audited consolidated financial statements for the year ended on December 31, 2025. The Company has not early adopted any new standards, interpretations or amendments that have been issued but are not yet effective. The preparation of these condensed consolidated interim financial statements in accordance with IAS 34 requires the use of certain critical accounting estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, and expenses for the end period. Such estimates and assumptions mainly affect the carrying amounts of the Company’s goodwill, contractual obligations, non-current assets, indefinite- lived intangible assets, inventory, deferred income taxes, and the allowance for doubtful accounts. These critical accounting estimates andassumptions represent approximations that are uncertain and changes in those estimates and assumptions could materially impact on the Company’s condensed consolidated interim financial statements. The critical judgments, estimates and assumptions in the application of accounting principles during the three and nine-month periods ended on September 30, 2026, are the same as those disclosed in the Company’s audited consolidated financial statements for the year ended on December 31, 2025. These condensed consolidated interim financial statements for the three and nine-month periods ended on September 30, 2026, were approved on October 29, 2026, to be issued in accordance with a resolution of the Board of Directors. 4 Net revenues Three-month period ended Nine-month period ended 2026 2025 2026 2025 Gross billing (i) 1,027,388 839,878 3,011,853 2,300,453 Billing from products (ii) 1,001,077 814,893 2,940,367 2,231,558 Billing from freight, contracting insurance services and others 26,311 24,985 71,486 68,895 Taxes on sales (89,885) (75,692) (276,364) (199,930) Return of products sales (372) (671) (2,102) (1,471) Net revenues 937,131 763,515 2,733,387 2,099,052 (i) Gross billing increased in the three-month period ended September 30, 2026, compared to the corresponding period in 2025, primarily due to higher zinc, copper and silver prices, partially offset by lower sales volumes in both the mining and smelting segments. For the nine-month period ended September 30, 2026, gross billing also increased compared to the same period in 2025, mainly driven by higher zinc, copper andsilver prices and higher zinc and lead sales volumes in the mining segment, partially offset by lower copper volumes, while sales volumes in the smelting segment remained relatively stable, as higher sales volumes in the first quarter offset the lower volumes sales in the second and third quarters. (ii) Includes a reduction adjustment of USD 50,852 (September 30, 2025: USD 24,637) related to the annual remeasurement of silver streaming revenue, as described in Note 1.1(d). 16 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 5 Expenses by nature Three-month period ended September 30, 2026 Cost of sales(i) Selling,general andadministrative Mineralexplorationand projectevaluation Total Raw materials and consumables used (ii) (410,303) - - (410,303) Third-party services (115,768) (7,961) (17,577) (141,306) Depreciation and amortization (88,843) (855) (82) (89,780) Employee benefit expenses (69,293) (21,534) (2,828) (93,655) Other expenses (8,398) (14,308) (1,431) (24,137) (692,605) (44,658) (21,918) (759,181) Three-month period ended September 30, 2025 Cost of sales(i) Selling,general andadministrative Mineralexplorationand projectevaluation Total Raw materials and consumables used (ii) (341,278) - - (341,278) Third-party services (123,158) (15,082) (16,711) (154,951) Depreciation and amortization (79,495) (1,795) (248) (81,538) Employee benefit expenses (56,892) (17,502) (3,808) (78,202) Other expenses (8,732) (3,109) (1,305) (13,146) (609,555) (37,488) (22,072) (669,115) Nine-month period ended September 30, 2026 Cost of sales(i) Selling,general andadministrative Mineralexplorationand projectevaluation Total Raw materials and consumables used (ii) (1,117,527) - - (1,117,527) Third-party services (362,206) (35,887) (41,134) (439,227) Depreciation and amortization (249,561) (3,649) (256) (253,466) Employee benefit expenses (203,624) (66,664) (9,613) (279,901) Other expenses (26,634) (22,031) (4,842) (53,507) (1,959,552) (128,231) (55,845) (2,143,628) Nine-month period ended September 30, 2025 Cost of sales(i) Selling,general andadministrative Mineralexplorationand projectevaluation Total Raw materials and consumables used (ii) (940,787) - - (940,787) Third-party services (348,892) (40,563) (39,701) (429,156) Depreciation and amortization (220,342) (2,893) (679) (223,914) Employee benefit expenses (154,419) (49,088) (9,539) (213,046) Other expenses (21,551) (12,712) (5,216) (39,479) (1,685,991) (105,256) (55,135) (1,846,382) (i) In the nine-month period ended September 30, 2026, the Company recognized USD 25,779 in cost of sales related to idle capacity resulting from operational disruptions that temporarily reduced production levels at certain operations. Of this amount, USD 7,995 was attributable to ElPorvenir, primarily due to a mechanical incident and seismic events; USD 1,585 related to Atacocha, reflecting a 23-day production suspension at the San Gerardo open pit caused by disruptions from local communities, which have since been resolved; USD 13,081 related to Nexa CJM, following an operational incident at the smelter reported on May 13, 2026, which has since been resolved; and USD 3,118 related to Cerro Lindo, recognized in August 2026, following a temporary production disruption caused by damage to the mine’s support infrastructure after aseismic event, which have since been resolved. 17 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (ii) Raw materials and consumables increased in the three-month period ended September 30, 2026, compared to the corresponding period in 2025, primarily due to higher unit costs of key raw materials, reflecting increased zinc and copper prices, which more than offset the lower sales volumes in both the mining and smelting segments. For the nine-month period ended September 30, 2026, raw materials and consumables also increased compared to the corresponding period in 2025, mainly due to higher unit costs of raw materials, particularly zinc concentrates used inthe Company’s operations, reflecting increased zinc and copper prices. 6 Other income and expenses, net Three-month period ended Nine-month period ended 2026 2025 2026 2025 Update on income tax provision (i) (451) (6,718) 5,340 (9,565) Insurance premium income (ii) 1,500 - 4,472 - Changes in fair value of energy forward contracts – note 10 (d) (825) 4,465 574 7,569 Changes in fair value of derivative financial instruments – note 10 (c) 2,083 16 2,371 (5) Changes in asset retirement and environmental obligations – note 17 2,661 (997) 1,947 (9,052) Loss on sale and write-off of property, plant and equipment (1,833) (998) (4,504) (683) Contribution to communities (2,176) (2,716) (5,054) (8,194) Slow moving and obsolete inventory (6,411) (4,757) (12,400) (10,072) Provision for legal claims (4,529) (5,982) (11,501) (12,023) Changes in fair value of offtake agreement – note 10 (e) (18,265) (5,806) (40,380) (20,125) Others (6,030) 512 (4,247) (2,931) (34,276) (22,981) (63,382) (65,081) (i) During the first quarter of 2026, the Company received USD 7,594, following a favorable decision by SUNAT regarding the Nexa CJM 2014 income tax dispute related to transfer pricing adjustments. This amount was recognized as follows: USD 1,689, related to the refund of fines and penalties, was recognized in “Other income and expenses”; USD 4,750 was recognized as “Interest related to uncertain tax positions, net” within “Others financial items, net”; and USD 1,155 was recognized as a gain within “Income tax”. During the nine-month period ended September 30, 2026, the Company recognized additional reversals of income tax penalties totalingUSD 3,651. Accordingly, the total benefit related to income tax penalties recognized during the nine-month period ended September 30, 2026, amounted to USD 5,340, comprising USD 1,689 recognized in the first quarter in connection with the favorable SUNAT decision and USD 3,651 related to additional reversals recognized during the second and third quarters of 2026. (ii) During the second quarter of 2026, the Company recognized income of USD 2,972 related to insurance proceeds received by Nexa BR as indemnification for business interruption losses resulting from the 2024 incident at Juiz de Fora. The proceeds were received in 2026 followingthe insurer's claim settlement process. Additionally, during the third quarter of 2026, 2019 received USD 1,500 in insurance proceeds related to a claim settlement, which was recognized as income during the period. 18 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 7 Net financial results Three-month period ended Nine-month period ended 2026 2025 2026 2025 Financial income Interest on income on financial investments and cash equivalents 1,912 2,705 5,658 8,489 Monetary adjustments 2,995 3,184 6,683 5,892 Interest on tax credits 159 511 727 897 Other financial income 1,028 628 3,037 1,782 6,094 7,028 16,105 17,060 Financial expenses Interest in loans and financings (31,506) (33,527) (98,087) (100,500) Interest on asset retirement and environmental obligations – note 17 (7,488) (7,371) (21,409) (20,347) Interest on factoring operations and confirming payables (5,910) (5,064) (14,701) (12,414) Interest on other liabilities (3,273) (4,015) (8,764) (8,108) Interest on lease liabilities – note 15 (b) (2,845) (2,550) (8,087) (7,309) Interest on contractual obligations (i) (8,747) (4,268) (10,077) (5,890) Interest on VAT discussions (239) - (802) - Bonds repurchase premium - - - (15,046) Transaction costs related to bond repurchase - - - (2,814) Other financial expenses (5,350) (5,324) (12,210) (13,745) (65,358) (62,119) (174,137) (186,173) Other financial items, net Interest related to uncertain tax positions, net (ii) 2,135 (17,209) 34,351 (16,705) Changes in fair value of derivative financial instruments –note 10 (c) 6,418 5,584 22,769 13,136 Changes in fair value of loans and financings – note 16 (c) 213 427 960 1,828 Debt modification gain – note 16 (c) - - 203 - Foreign exchange gains (losses) (iii) (4,544) 20,753 26,589 96,857 4,222 9,555 84,872 95,116 Net financial results (55,042) (45,536) (73,160) (73,997) (i) During the three and nine-month periods ended September 30, 2026, interest on contractual obligations included USD 8,205 (September 30, 2025: USD 3,559) of interest accretion related to the annual remeasurement of the silver streaming agreement, resulting from higher long-term silver prices and updates to the Cerro Lindo life-of-mine plan. For further details, see note 1.1 (d). (ii) During the nine-month period ended on September 30, 2026, the Company reversed USD 34,351 of interest previously accrued on uncertaintax positions related to the Nexa Peru Cerro Lindo ‘Tax Stability Agreement’ for the 2016 and 2017 tax years. For further details, see note 8 (c). (iii) The amounts for the nine-month period ended on September 30, 2026, are mainly related to exchange-rate variations on USD-denominated accounts receivable and payable between Nexa BR and NEXA, as well as to intercompany loans between Nexa BR and its related parties, for which the exchange variation is not eliminated in consolidation, and to foreign-currency-denominated loans. These transactions were affected by the volatility of the Brazilian Real (“BRL”), which appreciated against the USD during 2026. 19 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 8 Current and deferred income tax (a) Reconciliation of income tax (expense) benefit Three-month period ended Nine-month period ended 2026 2025 2026 2025 Income (loss) before income tax (28,707) 138,138 348,975 232,871 Luxembourg statutory income tax rate 23.87% 23.87% 23.87% 23.87% Expected income tax benefit (expense) at statutory rate 6,852 (32,974) (83,300) (55,586) Estimated annual income tax effective rate effect 13,804 14,150 21,185 7,791 Changes in provisions of uncertain income tax treatment (5,099) (10,377) 7,628 (7,238) Tax effects of translation of non-monetary assets/liabilities to functional currency (4,190) 10,851 (10,262) 28,300 Special mining levy and special mining tax (5,960) (7,989) (33,858) (13,088) Difference in tax rate of subsidiaries outside Luxembourg 4,914 (8,081) (21,981) (19,403) Unrecognized deferred tax on net operating losses (31,430) (13,975) (57,062) (37,883) Other tax differences 2,501 10,405 (2,717) 6,401 Income tax (expense) benefit (18,608) (37,990) (180,367) (90,706) Current (66,011) (35,648) (227,659) (80,534) Deferred 47,403 (2,342) 47,292 (10,172) Income tax (expense) benefit (18,608) (37,990) (180,367) (90,706) (b) Deferred income tax The changes in deferred income tax, net, are presented as follows: September 30, September 30, 2026 2025 Balance at the beginning of the period 129,348 104,352 Effect on income (loss) for the period 47,292 (10,172) Effect on other comprehensive income – fair value adjustment 137 108 Effect on other comprehensive (loss) income – hedge accounting (1,633) (825) Effects of consolidation of acquired subsidiary - 1,997 Effect on other comprehensive income – translation effect included in cumulative translation adjustment 14,696 31,961 Others (9) 7 Balance at the end of period 189,831 127,428 (c) Summary of uncertain tax positions on income tax As of September 30, 2026, the Company’s main uncertain tax positions were related to: (i) the interpretation of the application of the Cerro Lindo tax stability agreement; (ii) transfer pricing litigation related to transactions with related parties, (iii) the deductibility of certain costs and expenses and (iv) the interpretation regarding the exclusion of ICMS tax incentives from the calculation of IRPJ and CSLL. The estimated amount of uncertain tax positions that have neither been paid nor recognized in the balance sheet amounted to USD 228,836 (USD 291,535, as of December 31, 2025). The decrease compared with December 31, 2025, was primarily attributable to lower uncertain tax positions already paid related to the Cerro Lindo stability agreement, partially offset by a new uncertain tax position arising from the tax authorities interpretation regarding the exclusion of ICMS tax incentives from the calculation of IRPJ and CSLL at Nexa Brasil. Further details are provided below. 20 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated Cerro Lindo stability agreement claims The decrease in uncertain tax positions that have neither been paid nor recognized in the balance sheet compared with December 31, 2025, was primarily driven by the final administrative resolutions issued by SUNAT in May 2026 in respect of the 2016 and 2017 fiscal years. Consistent with its approach for the 2018 and 2019 fiscal years, SUNAT determined that taxable income should be allocated between the portionof the Company’s income subject to the tax stability regime (stabilized) and the portion not subject to such regime (non-stabilized). Accordingly, SUNAT reassessed the 2016 and 2017 fiscal years by applying an income tax rate of 20% to the stabilized income and the applicable general income tax rates of 28% and 29.5% to the non-stabilized income for 2016 and 2017, respectively. As a result of these resolutions, the Company reassessed its uncertain tax positions that have neither been paid nor recognized in the balance sheet, including related interest and penalties, resulting in a reduction in the estimated exposures from USD 146,718 to USD 19,889. On the other hand, SUNAT determined that the total assessed amount related to the 2014–2017 proceedings amounted to USD 225,544. Although the Company disagrees with certain portions of the assessments, it made and continues to make the required payments to continue challenging them before the ultimate competent judicial authority and to obtain a reduction in penalties and interest. During 2026, the Company paid USD 147,231, consisting of an upfront payment of USD 130,577 made during the second quarter and an additional payment of USD 16,654made during the third quarter. The remaining balance is payable in monthly installments over a period of up to 69 months. Of the amount paid, USD 51,568 related to tax treatments for which management concluded that it was not more likely than not that the ultimate competent judicial authority would accept the Company’s position and, accordingly, had previously recognized as a tax liability. This amount was therefore applied against the related tax liability. With respect to the remaining USD 95,663, management supported by the opinion of external legal counsel, concluded that it was more likely than not that the Company's tax treatment would be accepted by the ultimate competent judicialauthority and that the amounts would be recovered. Consequently, no liability or expense was recognized for these amounts, which were recorded as “Tax claim payments” within “Other assets”. As a result of the resolutions and related payments described above, the liabilities recognized for uncertain tax positions associated with the Cerro Lindo tax stability agreement and other matters, recorded within "Tax liabilities", decreased to USD 38,271 as of September 30, 2026, compared with USD 130,709 as of December 31, 2025. The decrease was mainly attributable to (i) the payment of USD 51,568 of previouslyrecognized tax liabilities, (ii) the reversal of USD 2,649 of penalties, recognized within "Other income and expenses, net", (iii) the reversal of USD 31,688 of interest, recognized within "Financial income”, and (iv) the reversal of USD 7,260 of tax liabilities related to the Cerro Lindo tax stability agreement for the 2020 and 2021 fiscal years, following a revised profit segmentation favorable to the Company. As of the date of these consolidated financial statements, SUNAT is auditing the Company’s income tax returns for the 2020 and 2021 fiscal years. Tax claim payments recognized within “Other assets” As of September 30, 2026, the tax amounts paid under claim or disputes in connection with tax assessments issued by SUNAT that remain subject to administrative and judicial proceedings totaled USD 234,911 (USD 125,670 as of December 31, 2025), mainly related to the Cerro Lindo stability agreement disputes, non-resident withholding tax assessments, and transfer pricing disputes. These amounts are recognized as “Tax claim payments” within “Other assets” and classified as non-current. 21 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated In addition, as of September 30, 2026, in connection with the Cerro Lindo proceedings, the Company had committed to future installment payments through 2032, comprising: (i) USD 1,647, recorded as "Tax liabilities" as the Company concluded that it is not more likely than not that the ultimate competent judicial authority will accept the Company's tax treatment; and (ii) USD 70,990, for which no liability was recognizedbecause management concluded that it is more likely than not that the ultimate competent judicial authority will accept the Company's tax treatment. As the installments related to amounts not recognized as tax liabilities are paid, they will be recognized as “Tax claim payments” within “Other assets”. The composition of the tax amounts paid under claim or disputes, and the outstanding installments are as follows: Tax claimpayments Future installmentCommitments Company Years September 30,2026 December 31,2025 September 30,2026 Cerro Lindo Stability agreement and other expenses 2014 and 2015 11,617 - 72,637 2016 and 2017 84,002 - - 2018 18,525 20,533 - 2019 8,409 - - Withholding tax on non – residents and Transfer Pricing discussions 2014 61,975 54,740 25,629 2017 24,954 25,327 - 2018 22,281 22,481 - Other deductions 2013-2014 2,210 2,247 - 2020-2021 336 342 - 2022-2024 602 - - Total 234,911 125,670 98,266 The increase in tax claim payments was primarily attributable to payments related to the Cerro Lindo tax stability agreement disputes. Suchpayments are required to pursue the Company’s challenges and do not constitute an acknowledgment of the underlying tax liabilities, acceptance of SUNAT’s position, or settlement of the related disputes. Based on management’s assessment, supported by external legal counsel, amounts related to tax treatments that are considered more likely than not to be accepted by the ultimate competent judicial authority are recognized as “Tax claim payments” within “Other assets” until the disputes are finally resolved. Depending on the final outcome, these amounts may be recovered in cash, offset against future tax obligations, orapplied against tax liabilities recognized if management’s assessment changes. Exclusion of ICMS tax incentives from the calculation of IRPJ and CSLL The Company is involved in an administrative tax proceeding concerning the exclusion of certain ICMS tax incentives from the calculation basis of Brazilian corporate income taxes, comprising corporate income tax (IRPJ) and social contribution on net income (CSLL), by its subsidiary, Nexa BR, for the 2020 through 2022 tax years. As of September 30, 2026, the gross amount under dispute was USD 64,064 (BRL 331,907),including penalties and interest. The proceeding arises from a tax assessment issued by the Brazilian Federal Revenue Service (“RFB”), challenging Nexa BR's exclusion of certain ICMS tax incentives from the IRPJ and CSLL tax bases and alleging that such exclusion was improper. The tax assessment was upheld at the first administrative level and is currently pending a final decision before the Administrative Council of Tax Appeals (“CARF”). In August 2026, the appeal was first heard by CARF and, despite a favorable opinion recommending the cancellation of thetax assessment, the proceeding remains pending following a request for review. 22 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated Based on the opinion of external legal counsel and management’s assessment of the facts and circumstances available as of September 30, 2026, the Company concluded that it is more likely than not that the tax treatment adopted by Nexa BR will ultimately prevail. Accordingly, no liability was recognized as of September 30, 2026. Except for the movements described above, there were no other significant changes to the nature or status of the Company’s uncertain tax position compared with those disclosed in the annual consolidated financial statements for the year ended December 31, 2025, to which reference is made for further details. 9 Financial instruments (a) Breakdown by category The Company’s financial assets and liabilities are classified as follows: September 30, 2026 Note Amortizedcost Fairvaluethroughprofit orloss Fair valuethrough Othercomprehensiveincome Total Assets per balance sheet Cash and cash equivalents 404,501 - - 404,501 Financial investments 10,602 - - 10,602 Other financial instruments 10 (a) - 33,713 - 33,713 Trade accounts receivables (i) 47,053 166,144 - 213,197 Investments in equity instruments - - 5,313 5,313 Related parties (ii) 651 - - 651 462,807 199,857 5,313 667,977 Liabilities per balance sheet Loans and financings 16 (a) 1,660,794 91,686 - 1,752,480 Lease liabilities 15 (b) 139,250 - - 139,250 Other financial instruments 10 (a) - 104,482 - 104,482 Trade payables 523,866 - - 523,866 Confirming payables 380,708 - - 380,708 Dividends payable 24,336 - - 24,336 Use of public assets (iii) 19,716 - - 19,716 Related parties (iii) 7,103 - - 7,103 2,755,773 196,168 - 2,951,941 December 31, 2025 Note Amortizedcost Fairvaluethroughprofit orloss Fair valuethrough Othercomprehensiveincome Total Assets per balance sheet Cash and cash equivalents 515,871 - - 515,871 Financial investments 5,687 - - 5,687 Other financial instruments 10 (a) - 36,767 - 36,767 Trade accounts receivables (i) 35,973 192,615 - 228,588 Investments in equity instruments - - 5,219 5,219 557,531 229,382 5,219 792,132 Liabilities per balance sheet Loans and financings 16 (a) 1,614,386 91,598 - 1,705,984 Lease liabilities 15 (b) 121,134 - - 121,134 Other financial instruments 10 (a) - 103,893 - 103,893 Trade payables 500,025 - - 500,025 Confirming payables 415,388 - - 415,388 Dividends payable 26,918 - - 26,918 Use of public assets (iii) 18,808 - - 18,808 Related parties (iii) 4,695 - - 4,695 2,701,354 195,491 - 2,896,845 23 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (i) Composed of receivables included in the forfaiting program and receivables from sales that are subsequently adjusted based on changes in LME prices. (ii) Classified as “Other assets” in the consolidated balance sheet. (iii) Classified as “Other liabilities” in the consolidated balance sheet. (b) Fair value by hierarchy September30, 2026 Note Level 1 Level 2 Total Assets Other financial instruments 10 (a) - 33,713 33,713 Trade accounts receivables - 166,144 166,144 Investments in equity instruments (i) 5,313 - 5,313 5,313 199,857 205,170 Liabilities Loans and financings designated at fair value (ii) - 91,686 91,686 Other financial instruments 10 (a) - 104,482 104,482 - 196,168 196,168 December 31, 2025 Note Level 1 Level 2 Total Assets Other financial instruments 10 (a) - 36,767 36,767 Trade accounts receivables - 192,615 192,615 Investments in equity instruments (i) 5,219 - 5,219 5,219 229,382 234,601 Liabilities Loans and financings designated at fair value (ii) - 91,598 91,598 Other financial instruments 10 (a) - 103,893 103,893 - 195,491 195,491 (i) To determine the fair value of the investments in equity instruments, the Company uses the shares’ quotation as of the last day of the reporting period. (ii) Loans and financings are measured at amortized cost, except for certain contracts for which the Company has chosen the fair value option. 10 Other financial instruments (a) Composition September 30,2026 Derivatives financialinstruments Offtake agreementmeasured at FVTPL Energy forwardcontracts at FVTPL Total Current assets 15,996 - 1,565 17,561 Non-current assets 16,117 - 35 16,152 32,113 - 1,600 33,713 Current liabilities (3,456) (30,235) (885) (34,576) Non-current liabilities (7,682) (56,196) (6,028) (69,906) (11,138) (86,431) (6,913) (104,482) Other financial instruments, net 20,975 (86,431) (5,313) (70,769) December 31,2025 Derivatives financialinstruments Offtake agreementmeasured at FVTPL Energy forwardcontracts at FVTPL Total Current assets 16,554 - 2,089 18,643 Non-current assets 18,124 - - 18,124 34,678 - 2,089 36,767 Current liabilities (11,646) (20,587) - (32,233) Non-current liabilities (20,691) (43,322) (7,647) (71,660) (32,337) (63,909) (7,647) (103,893) Other financial instruments, net 2,341 (63,909) (5,558) (67,126) 24 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (b) Fair value by strategy September 30, December 31, 2026 2025 Strategy Per Unit Notional Fair value Notional Fair value Concentrate Sales (i) Silver Zero Cost Collar Oz 429,124 116 1,651,819 (6,478) Gold Zero Cost Collar Oz 227 11 2,067 (3) 127 (6,481) Mismatches of quotational periods Zinc forward ton 200,320 1,578 239,304 1,053 1,578 1,053 Metal sales Zinc forward ton 10,384 1,005 3,249 548 1,005 548 Interest rate risk IPCA vs. CDI BRL 100,000 (136) 100,000 (421) CDI vs. USD (ii) BRL 650,000 18,401 650,000 7,642 18,265 7,221 20,975 2,341 (i) On December 16, 2025, the Company entered into gold and silver Zero Cost Collar (“ZCC”) derivative contracts to hedge forecasted revenues, with the objective of mitigating commodity price risk related to its Peruvian operations during 2026. The instruments have monthly maturities through December 2026 and limit downside price risk while capping upside potential. (ii) On March 28, 2025, the Company entered into a cross-currency swap with a notional amount of USD 112,652 (BRL 650,000 at thetransaction date) to hedge the BRL exposure related to Nexa BR debentures maturing in 2030. The instrument mirrors the debentures’ cash flows, is measured at FVTPL, and its effects are recognized in net financial results. (c) Changes in fair value in the nine months ended on September 30 September 30,2026 Strategy Cost ofsales Netrevenues Otherincome andexpenses,net - note 6 Netfinancialresults - note7 Othercomprehensiveincome Realizedloss (gain) Concentrate sales - (1,972) (51) - 6,608 2,023 Mismatches of quotational periods (40,065) 24,424 2,422 - (861) 14,656 Non-standard metal sales - 1,611 - - - (1,165) Interest rate risk – IPCA vs. CDI - - - 142 - 164 Interest rate risk – CDI vs. USD - - - 22,627 - (12,253) (40,065) 24,063 2,371 22,769 5,747 3,425 September 30,2025 Strategy Cost ofsales Netrevenues Otherincome andexpenses,net - note 6 Netfinancialresults - note7 Othercomprehensiveincome Realizedloss (gain) Mismatches of quotational periods (6,599) 76 (5) - 1,775 551 Non-standard metal sales - 829 - - - 35 Interest rate risk – IPCA vs. CDI - - - (496) - 152 Interest rate risk – CDI vs. USD - - - 13,632 - (6,108) (6,599) 905 (5) 13,136 1,775 (5,370) 25 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (d) Energy forward contracts Notional Notional September30, September30, September30, September30, 2026 2025 2026 2025 Balance at the beginning of the period (5,558) (13,670) 652,184 747,498 Changes in fair value 574 7,569 - - Foreign exchange effects (329) (1,717) - - Energy forward contracts (Megawatts) - - (143,831) (38,043) Balance at the end of period (5,313) (7,818) 508,353 709,455 Bookmark (e) Offtake agreement measured at FVTPL: Changes in fair value bookmark Notional(tons) Notional(tons) September30, September30, September30, September30, 2026 2025 2026 2025 Balance at the beginning of the period (63,909) (19,666) 18,662 22,288 Changes in fair value (i) (40,380) (20,125) - - Deliveries of copper concentrates (i) - - (2,998) (2,668) Price cap realized (i) 17,858 2,780 - - Balance at the end of period (86,431) (37,011) 15,664 19,620 (i) Under the Aripuanã offtake agreement, the selling price of copper concentrate is subject to a contractual price cap. When copper market prices exceed this cap, the Company receives less than it would based on prevailing market prices. This obligation is measured at fair value as a financial instrument liability, based on the volumes remaining to be delivered and long-term forward copper prices. In the nine-month periods ended September 30, 2026 and 2025, this liability increased mainly due to increases in long-term forward copper prices, which widened the expected difference between market prices and the contractual price cap applicable to future deliveries (Changes in fair value). This increase was partially offset by deliveries made during the respective periods. As copper concentrate was delivered at the capped price, the portion of the liability associated with the delivered volumes was realized, reducing the financial instrument liability, with the corresponding effect recognized in revenue (Price cap realized). 11 Inventory (a) Composition (b) bookmark September 30, December 31, 2026 2025 Finished products (i) 183,077 139,488 Semi-finished products (ii) 181,895 120,155 Raw materials 112,578 80,434 Auxiliary materials and consumables 150,469 128,503 Inventory provisions (iii) (63,918) (54,185) 564,101 414,395 (i) Finished products increased during the nine-month period ended September 30, 2026, mainly due to higher zinc inventories at Nexa Resources US (“Nexa US”), reflecting higher sales volumes expected in the following period, as well as higher concentrate inventories at Nexa Perú, primarily zinc, partly reflecting the build-up of strategic concentrate inventories as part of the Company’s preparedness measures for the2026-27 “El Niño” event. (ii) Semi-finished products increased during the nine-month period ended September 30, 2026, mainly due to higher calcine and zinc sheetsvolume at the Nexa CJM, driven by higher concentrate processing volumes. (iii) Inventory provisions increased during the nine-month period ended September 30, 2026, mainly due to higher provisions for obsolete maintenance materials at Nexa BR, partially offset by the reversals of provisions for net realizable value adjustments at Nexa CJM due to higher refined zinc prices. 26 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 12 Other assets and other liabilities (a) Other assets September 30, December 31, 2026 2025 Tax claim payments (i) 234,911 125,670 Other recoverable taxes (ii) 134,013 102,187 Prepaid expenses 15,548 9,364 Judicial deposits 10,757 9,221 Advances to third parties 7,923 3,624 Sublease receivable 7,447 - Other assets 29,162 38,586 439,761 288,652 Current assets 120,986 77,225 Non-current assets 318,775 211,427 (i) This amount is mainly related to income tax payments made in connection with tax assessments arising from SUNAT’s interpretation of theCerro Lindo Tax Stability Agreement for the 2014 through 2019 tax years and transfer pricing disputes involving transactions with related parties. These payments are required to preserve the Company’s right to continue challenging the assessments through the judicial process and may be recovered, together with applicable interest, if the Company ultimately prevails in the related proceedings. The payments were made in Peruvian soles and are therefore subject to foreign currency fluctuations against the U.S. dollar. For further information, see Notes 1.1 (b) and 8 (c). (ii) Other recoverable taxes are composed primarily of tax credits related to ICMS (Tax on Circulation of Goods and Services), mainly generatedfrom purchases. In addition, the balances include PIS (Social Integration Program) and COFINS (Contribution to Social Security Financing) tax credits, primarily arising from the acquisition of fixed assets. (b) Other liabilities September 30, December 31, 2026 2025 Advances from customers (i) 70,976 61,006 Other tax liabilities (ii) 50,040 70,292 Use of public assets 19,716 18,808 Other trade payables 48,250 36,919 Other liabilities 19,027 19,078 208,009 206,103 Current liabilities 148,526 143,834 Non-current liabilities 59,483 62,269 (i) As of September 30, 2026, this balance was primarily composed of: (a) the remaining balance of an advance payment received by El Porvenirin December 2025; (b) advance payments received in 2026 by the subsidiaries Nexa CJM and Nexa BR; and (c) the outstanding balance of an advance payment received by Cerro Lindo in September 2026. Revenue associated with these advances will be recognized upon delivery of the related products, as the corresponding performance obligations are satisfied. These advances will be offset against revenue over a period of approximately three months, except for one advance payment that will be offset over approximately twelve months. (ii) Other tax liabilities comprise various taxes arising from the Company’s operations, primarily Brazilian taxes related to routine operatingactivities, as well as other taxes duties and contributions, mining-related taxes and fees, mining rights, and value-added tax (VAT) payable in certain jurisdictions. The balance decreased from December 31, 2025, to September 30, 2026, mainly due to a reduction of USD 7,031 in ICMS payable at Nexa BR, resulting from the utilization of tax credits to settle installments related to the unfavorable court decision issued in 2025 and to partially settle the voluntary tax disclosure, as well as a reduction of USD 5,562 in VAT payable in Peru. 27 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 13 Property, plant and equipment (a) Changes in the nine months ended on September 30 September 30, September 30, 2026 2025 Lands,dam andbuildings Machinery,equipment,andfacilities Assets andprojectsunderconstruction Assetretirementobligations Miningprojects Others Total Total Balance at the beginning of the period 1,060,189 706,326 469,414 116,810 55,678 25,255 2,433,672 2,097,508 Cost 1,942,174 2,586,948 542,522 213,674 126,979 37,525 5,449,822 5,018,137 Accumulated depreciation and impairment (881,985) (1,880,622) (73,108) (96,864) (71,301) (12,270) (3,016,150) (2,920,629) Balance at the beginning of the period 1,060,189 706,326 469,414 116,810 55,678 25,255 2,433,672 2,097,508 Additions - 10 272,314 5,851 - 17 278,192 232,273 Disposals and write-offs (3) (2,054) (526) (2,584) - (48) (5,215) (2,008) Depreciation (64,323) (99,669) - (7,413) (759) (759) (172,923) (138,126) Impairment reversal (loss) of long-lived assets - note 18 (37,269) (52,145) (18,077) (7,564) - (2,008) (117,063) 16,261 Foreign exchange effects 43,041 31,132 11,351 5,582 69 1,035 92,210 210,705 Remeasurement - - - (1,274) - - (1,274) (2,817) Effect of new subsidiary acquisition - - - - - - - 854 Transfers 128,170 125,609 (260,461) - (5,386) 6,253 (5,815) (4,180) Balance at the end of period 1,129,805 709,209 474,015 109,408 49,602 29,745 2,501,784 2,410,470 Cost 2,127,658 2,775,817 565,672 239,400 121,674 42,881 5,873,102 5,439,085 Accumulated depreciation and impairment (997,853) (2,066,608) (91,657) (129,992) (72,072) (13,136) (3,371,318) (3,028,615) Balance at the end of period 1,129,805 709,209 474,015 109,408 49,602 29,745 2,501,784 2,410,470 Average annual depreciation rates % 4 8 - UoP UoP 7 28 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 14 Intangible assets (a) Changes in the nine months ended on September 30 September 30, September 30, 2026 2025 Goodwill Rights touse naturalresources Others Total Total Balance at the beginning of the period 306,208 548,846 22,874 877,928 834,687 Cost 318,239 1,844,122 51,630 2,213,991 2,176,592 Accumulated amortization and impairment (12,031) (1,295,276) (28,756) (1,336,063) (1,341,905) Balance at the beginning of the period 306,208 548,846 22,874 877,928 834,687 Additions - 5 3,215 3,220 1,606 Amortization - (39,004) (2,681) (41,685) (54,109) Impairment reversal (loss) of long-lived assets - note 18 (4,686) (1,355) (42) (6,083) 87,955 Foreign exchange effects 493 3,742 1,260 5,495 13,247 Effect of new subsidiary acquisition - - - - 7 Disposals and write-offs - (834) (904) (1,738) - Remeasurement of mineral rights contract (i) - (552) - (552) 72 Transfers - 5,387 428 5,815 4,180 Balance at the end of period 302,015 516,235 24,150 842,400 887,645 Cost 319,439 1,852,494 56,760 2,228,693 2,223,364 Accumulated amortization and impairment (17,424) (1,336,259) (32,610) (1,386,293) (1,335,719) Balance at the end of period 302,015 516,235 24,150 842,400 887,645 Average annual amortization rates % - UoP 3 ark (i) In August 2022, Nexa Recursos Minerais S.A. acquired mineral rights from the bankruptcy estate of Mineração Areiense S.A. – MASA, with the purchase price including a deferred payment due four years after the fulfillment of the applicable contractual conditions. During September 2026, the due date of the deferred payment was extended to November 25, 2028. As a result of the extension, the Company remeasured theliability associated with the deferred consideration and recognized the corresponding adjustment to the carrying amount of the intangible asset related to the mineral rights. 15 Right-of-use assets and lease liabilities (a) Right-of-use assets – Changes in the nine months ended on September 30 September 30, September 30, 2026 2025 Lands andBuildings Machinery,equipment,andfacilities ITequipment Vehicles Total Total Balance at the beginning of the period 23,638 71,547 4,576 10,406 110,167 85,265 Cost 36,673 155,940 4,976 16,205 213,794 157,708 Accumulated amortization (13,035) (84,393) (400) (5,799) (103,627) (72,443) Balance at the beginning of the period 23,638 71,547 4,576 10,406 110,167 85,265 New contracts 23 54,167 1,014 6,164 61,368 45,164 Disposals and write-offs (1,758) (1,172) - - (2,930) - Renegotiation of contracts - - - - - (132) Derecognition of right-of-use (i) (11,422) - - - (11,422) - Amortization (1,054) (30,292) (1,774) (5,738) (38,858) (31,679) Remeasurement (540) 484 (28) (43) (127) 4,117 Foreign exchange effects 517 2,669 79 286 3,551 5,660 Effect of new subsidiary acquisition - - - - - 3,094 Balance at the end of period 9,404 97,403 3,867 11,075 121,749 111,489 Cost 13,877 184,291 5,937 23,290 227,395 203,637 Accumulated amortization (4,473) (86,888) (2,070) (12,215) (105,646) (92,148) Balance at the end of period 9,404 97,403 3,867 11,075 121,749 111,489 Average annual amortization rates % 31 34 33 37 (i) The adjustment arises from the derecognition of a right-of-use asset (“ROU”) following its classification as a finance sublease under IFRS 16. Accordingly, the ROU asset was replaced by a 29 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated sublease receivable (net investment). Furthermore, there was no termination or early settlement of the head lease, which remains recognized as a lease liability. (b) Lease liabilities – Changes in the nine months ended on September 30 ok September 30, September 30, 2026 2025 Balance at the beginning of the period 121,134 95,899 New contracts 61,368 45,164 Accrued interest - note 7 8,087 7,309 Foreign exchange effects 2,981 4,215 Disposals and write-offs (2,346) - Remeasurement (4,068) 4,117 Interest paid on lease liabilities (7,895) (7,154) Payments of lease liabilities (40,011) (31,602) Effect of new subsidiary acquisition - 3,745 Balance at the end of period 139,250 121,693 Current liabilities 46,821 44,320 Non-current liabilities 92,429 77,373 16 Loans and financings (a) Composition Total Fair value September December September December 30, 2026 31, 2025 30, 2026 31, 2025 Type Averageinterest rate Current Non-current Total Total Total Total Eurobonds – USD Pre-USD 6.67% 35,316 1,203,451 1,238,767 1,221,571 1,315,956 1,394,529 BNDES TJLP + 2.82% TLP - IPCA +5.80% 20,104 141,212 161,316 175,359 148,308 164,974 Debentures CDI+ 1.50% (54) 124,969 124,915 122,124 128,637 123,185 Export credit notes SOFR TERM +1.88%SOFR + 2.40% 30,377 91,267 121,644 122,148 121,450 123,799 Bank credit note SOFR TERM +1.80% 847 50,000 50,847 50,149 50,668 49,594 Advance on export foreign exchange contract Pre-USD 4.75% 41,086 - 41,086 - 40,840 - Other 2,680 11,225 13,905 14,633 11,972 12,349 130,356 1,622,124 1,752,480 1,705,984 1,817,831 1,868,430 Current portion of long-term loans and financings (principal) 90,559 Interest in loans and financings 39,797 (b) Loans and financing transactions during the nine-month period ended on September 30, 2026 On March 4, 2026, to strengthen its short-term liquidity position, the Company entered into an ACC with a top-tier financial institution for a principal amount of USD 40,000 (BRL 208,360), at an annual interest rate of 4.69%. The loan originally had a six-month tenor, maturing on August 31, 2026, and was subsequently extended for an additional three months at an annual interest rate of 4.75%, therefore maturing on November 27, 2026. The loan is repayable in a single installment upon submission of the supporting export documentation, and the companyexpects to repay the loan upon its new maturity date. 30 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated (c) Changes in the nine months ended on September 30 September 30, September 30, 2026 2025 Balance at the beginning of the period 1,705,984 1,762,633 New loans and financings 40,000 540,000 Debt issue costs - (4,902) Interest accrual 100,006 103,517 Changes in fair value of financial liabilities related to changes in the Company’s own credit risk 406 322 Changes in fair value of loans and financings - note 7 (960) (1,828) Debt modification gain - note 7 / (i) (203) - Loss on bonds repurchase - 1,905 Payments of loans and financings (27,304) (525,506) Foreign exchange effects 20,242 51,015 Interest paid on loans and financings (85,691) (93,526) Balance at the end of period 1,752,480 1,833,630 (i) In March 2026, the Company renegotiated the terms of its Export Credit Note maturing in 2027, with an outstanding principal amount of USD 30,000, reducing the interest rate from term SOFR plus 2.40% to term SOFR plus 1.88%. This transaction was accounted for as a debt modification, and a gain of USD 203 was recognized in other financial items, net, as shown in note 7. (d) Maturity profile September 30, 2026 2026 2027 2028 2029 2030 As from 2031 Total Eurobonds – USD (i) 34,722 312 110,050 (953) (953) 1,095,589 1,238,767 BNDES 5,124 19,977 19,977 14,512 14,512 87,214 161,316 Debentures (i) (49) (54) (197) (197) 125,412 - 124,915 Export credit notes (i) 472 29,787 (473) 91,858 - - 121,644 Bank credit note 847 - 50,000 - - - 50,847 Advance on export foreign exchange contract 41,086 - - - - - 41,086 Other 700 2,641 2,641 2,641 2,641 2,641 13,905 82,902 52,663 181,998 107,861 141,612 1,185,444 1,752,480 (i) The negative balances refer to related funding costs (fee) amortization. (e) Guarantees and covenants The Company has loans and financing subject to certain requirements at the consolidated level, including the obligation to maintain minimum global-scale corporate credit ratings of (i) BB+ from Fitch Ratings and (ii) Ba3 from Moody’s. No changes to contractual guarantees occurred during the nine-month period ended September 30, 2026. The minimum rating requirements described above apply only to the Company’s financing agreements with the Brazilian Development Bank (BNDES). As of September 30, 2026, the Company was in compliance with these requirements, with corporate credit ratings of BBB- from Fitch and Ba2 from Moody’s. In August 2026, following the announcement of the proposed sale of the controlling shareholder’s interest in the Company, Fitch placed the Company’s ratings on Rating Watch Negative and indicated that any potential downgrade is expected to be no more than one notch. A one-notch downgrade by Fitch would not result in non-compliance with the minimum rating requirement. Moody’s outlook remains stable. Management continues to monitor its credit ratings and has not identified any non-compliance with these requirements. 31 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 17 Asset retirement, restoration and environmental obligations Changes in the nine months ended on September 30 September 30, September 30, 2026 2025 Assetretirementobligations Environmentalobligations Total Total Balance at the beginning of the period 284,811 35,622 320,433 279,386 Additions (ii) 5,851 3,276 9,127 10,723 Payments (10,950) (4,736) (15,686) (10,979) Interest accrual - note 7 18,935 2,474 21,409 20,347 Remeasurement - discount rate (i) / (ii) (7,894) 1,397 (6,497) 902 Write-offs (2,584) - (2,584) - Foreign exchange effects 8,488 2,197 10,685 26,295 Balance at the end of period 296,657 40,230 336,887 326,674 Current liabilities 63,309 9,444 72,753 53,917 Non-current liabilities 233,348 30,786 264,134 272,757 bookmark (i) As of September 30, 2026, the credit risk-adjusted rate used for Peru ranged between 9.53% and 14.10% (December 31, 2025: 5.04% and 10.70%), and for Brazil between 4.58% and 7.52% (December 31, 2025: 7.42% and 12.17%). (ii) The changes during the nine-month period ended September 30, 2026, mainly reflect the effects of additions and remeasurements, including: revisions to the expected timing of disbursements for decommissioning obligations at certain operations, based on updated execution schedules under the existing closure plans and revised asset retirement and environmental obligation studies; and changes in discount rates, as describedabove. As a result, asset retirement obligations for operational assets increased by USD 4,577 (during the nine-month period ended September 30, 2025: USD 2,573 increase), as shown in note 13. For non-operational assets, changes in asset retirement and environmental obligations resulted in a gain of USD 1,947 (nine-month period ended September 30, 2025: USD 9,052 loss), as detailed in note 6. 18 Impairment of long-lived assets At each reporting date, the Company assesses whether there are any indicators that the carrying amount of an asset or cash-generating unit (“CGU”) may not be recoverable, or that an impairment loss recognized in prior periods for assets other than goodwill may no longer exist or mayhave decreased. Goodwill is tested for impairment annually, or more frequently if there are indicators of impairment. Impairment assessment As of September 30, 2026, the Company performed its annual impairment test for the CGUs to which goodwill is allocated: the Mining Perugroup of CGUs (comprising the Cerro Pasco and Cerro Lindo CGUs), the Cajamarquilla CGU, and the Juiz de Fora’s CGU. Recoverable amounts were determined based on fair value less costs of disposal (FVLCD) using assumptions and projections consistent with the Company’s strategic planning process. In addition, the Company assessed other CGUs for which impairment indicators were identified. The impairment losses recognized as a result of these assessments are presented below. Três Maria System and Juiz de Fora CGUs As a result of the impairment tests, the carrying amounts of the Juiz de Fora CGU and the Três Marias System CGU (comprising the Três Marias smelter and the Vazante mine) exceeded their recoverable amounts. Accordingly, impairment losses of USD 60,297 for Juiz de Fora and USD 58,033 for the Três Marias System, totaling USD 118,330, were recognized in “Impairment (loss) reversal of long-lived assets” in the income statement. 32 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated For the Juiz de Fora CGU, in accordance with IAS 36, the impairment loss was first allocated to the carrying amount of goodwill allocated to the CGU, resulting in its full impairment of USD 4,686, as disclosed in note 14. The remaining USD 55,611 was allocated to the other assets of the CGU on a pro rata basis, based on the carrying amount of each asset, as disclosed in note 13. For the Três Marias System CGU, the impairment loss was allocated to the assets of the CGU on a pro rata basis, based on the carrying amount of each asset, as disclosed in note 13. Cerro Pasco CGU and Cajamarquilla No impairment was identified for the Mining Peru group of CGUs or for Cajamarquilla. Impairment test summary In summary, for the nine-month period ended September 30, 2026, Nexa recognized the following impairment loss/reversal: Impairment (losses) reversals 2026 2025 Cerro Pasco CGU (i) - 108,005 Juiz de fora (i) (60,297) - Três Marias System (i) (58,033) - Others individual assets (4,816) (3,789) Total (123,146) 104,216 (i) In 2025, the impairment reversal in Cerro Pasco CGU was driven mainly by the increase of the projected long-term metal prices, especially zinc. In 2026, the impairment loss in Juiz de Fora and Três Marias System mainly reflected changes in operational and market assumptions, including operating performance, higher costs and investments, lower TCs, lower zinc grades at Vazante, and the appreciation of the BRL against the USD, as these CGUs have the BRL as their functional currency. In addition to the impairment losses recognized for the CGUs, the Company identified impairment of other assets in the amount of USD 4,816 in September 2026. As a result, total impairment losses of USD 123,146 were recognized under “Impairment (loss) reversal of long-lived assets” in the income statement for the nine-month period ended September 30, 2026. (a) Key assumptions used in impairment test The recoverable amounts for each CGU were determined using the FVLCD method, which resulted in values higher than those determined using the VIU method. The Company identified long-term zinc prices, discount rates, the exchange rate considering Brazilian real (BRL) versus U.S. Dollar (USD), and LOM as key assumptions in determining the recoverable amounts, due to the material impact such assumptions may have on the recoverable value. The main assumptions are summarized below: 2026 2025 Long-term zinc price (USD/t) 3,180 3,120 Discount rate (Peru) 7.75% 7.08% Discount rate (Brazil) 8.28% 7.63% Exchange rate (BRL x USD) 5.18 5.43 Brownfield projects - LOM (Years) From 2 to 23 From 3 to 25 (b) Sensitivity analysis – Tested CGUs and Goodwill The Company estimated the amount by which the value assigned to the key assumptions must change for the recoverable amount of eachtested CGU to be equal to its carrying amount (headroom equal to zero). For CGUs with positive headroom, the analysis indicates the deterioration in the assumption required to eliminate the headroom. For CGUs with impairment losses, the analysis indicates the improvement in the assumption required for the recoverable amount to equal the carrying amount. 33 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated CGU (Deficit) excess over Change in Long term Zinc (USD/t) Increase in WACC Appreciation of BRL over USD recoverable amount Change Price Change Rate Change Price Três Marias System (58,033) 3.62% 3,295 (1.30%) 6.98% 1.93% 5.28 Juiz de Fora (60,297) 15.41% 3,670 (3.20%) 5.08% 4.83% 5.43 Aripuanã 674,045 (38.37%) 1,960 9.06% 17.34% (24.13%) 3.93 Cerro Pasco 687,502 (62.21%) 1,202 15.96% 23.71% - - Cerro Lindo 442,085 (54.95%) 1,433 21.16% 28.91% - - Mining Peru 930,833 (51.12%) 1,554 12.63% 20.38% - - Cajamarquilla 451,374 (43.70%) 1,790 4.04% 11.79% - - 19 Long-term commitments (a) Projects evaluation In relation to the Magistral Project, no changes have occurred in the circumstances described in the annual financial statements as of December 31, 2025. As of the date of this report, the deadline to fulfill the Accreditable Investment Commitment remains suspended, as does the potential application of the related penalty in the amount of USD 97,029. (b) Environmental Guarantee for Dams In relation to the guarantees for dams, there have been no changes to the regulatory framework since the annual financial statements as ofDecember 31, 2025. The Company continues to await approval from the environmental authorities before proceeding with the remaining obligations. (c) Instalments commitments As of September 30, 2026, the Company had installment payment agreements with the Peruvian Tax Authority (SUNAT) related to taxassessments for the 2014–2017 fiscal years that remain subject to ongoing judicial proceedings. Participation in these installment agreements does not constitute acceptance of the tax authority’s position or settlement of the underlying disputes. As of September 30, 2026, the remaining installment payment commitments relate exclusively to the 2014 and 2015 fiscal years and totaled USD 98,266, representing future cash outflows payable in accordance with the agreed installment schedules, with payments due through 2032. Of this amount, USD 1,647 has been recognized within "Tax liabilities". No liability has been recognized for the remaining USD 96,619, asmanagement considers it more likely than not that the related tax positions will ultimately be sustained by the competent judicial authority. Installment payments related to these amounts will be recorded as "Tax claim payments" within "Other assets" when paid. For further details regarding the underlying tax matters and related accounting treatment, see note 8(c). In addition, during August 2026, the Company made a payment of USD 16,654 related to the 2016 and 2017 fiscal years, as required by SUNAT to preserve the admissibility of its appeal before the Tax Court. Following this payment, no further installment payment commitments remain inrespect of those fiscal years. 34 of 35
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Nexa Resources S.A. Notes to the condensed consolidated interim financial statements Unaudited Nine-month periods ended on September 30 All amounts in thousands of US Dollars, unless otherwise stated 20 Events after the reporting period (a) New CJM Tax claim payments On October 1, 2026, SUNAT determined an amount payable in connection with the CJM 2016 proceedings. The Company disagrees with such determination and continues to challenge it through judicial proceedings. Payments made in connection with these proceedings do not constitute an acknowledgment of the underlying tax obligation. On October 14, 2026, SUNAT approved the payment installment arrangement requested by the Company for a total amount of USD 22,074, including the related interest. Under this arrangement, the Company made an upfront payment of USD 4,500, with the remaining balance payable in monthly installments over a period of up to 72 months. Accordingly, this event did not result in any adjustment to the amounts recognized in the interim financial statements as of September 30, 2026. Amounts paid subsequent to the reporting date were recognized as “Tax claim payments” within “Other assets” in October 2026. (b) Dividend payments Pollarix On October 14, 2026, Pollarix paid the outstanding dividends approved during the third quarter of 2026, totaling USD 10,435 (BRL 53,610), of which USD 8,289 (BRL 42,582) was paid to non-controlling interests and USD 2,146 (BRL 11,028) to Nexa BR. Nexa Peru On October 26, 2026, Nexa Peru paid the outstanding dividends related to prior periods, totaling USD 49,327, of which USD 41,216 to Nexa CJM, USD 85 to NEXA and USD 8,026 was paid to non-controlling interests, net of taxes. The payments were made in accordance with the approved payment schedule. (c) S&P Global Ratings credit rating downgrade On October 27, 2026, S&P Global Ratings downgraded the long-term issuer credit rating of Nexa and the ratings of its senior unsecured notes from BBB- to BB+, with a Stable outlook, and affirmed its A-3 short-term issuer credit rating. According to S&P, the downgrade reflects its view that, while Nexa is expected to remain a strategically important subsidiary of its prospective parent company, Boliden AB, the relationship with its new parent is one category weaker than that previously attributed to Votorantim S.A. Under the indenture governing the 2028 Notes, this downgrade constitutes a "Rating Decline", as defined therein. Accordingly, subject to theclosing of the transaction with Boliden, the Company will be required to launch a change of control tender offer for the 2028 Notes at a price equal to 101% of their principal amount within 30 days following the change of control. At September 30, 2026, the principal amount of USS 111,018 was outstanding under the 2028 Notes. The Company will notify the trustee as required under the indenture. Under the indentures governing the 2034 and 2037 Notes, a change of control tender offer would only be triggered if Fitch were to downgrade those notes, resulting in a Rating Decline as defined in the indentures. The Company continues to evaluate alternatives regarding its outstanding indebtedness, including the 2028 Notes, in line with its ongoing liability management and gross debt reduction strategies. This event does not affect the amounts recognized in these interim financial statements. *.*.* 35 of 35