Earnings release
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Exhibit 99.1 News Release ADVANSIX ANNOUNCES THIRD QUARTER 2026 FINANCIAL RESULTS 3Q26 Sales of $431 million, up 15% versus prior year 3Q26 Earnings Per Share of ($0.28); Adjusted Earnings Per Share of ($0.24) 3Q26 Cash Flow from Operations of $48 million, up $21 million versus prior year Project CENTURY Selected for $47 million FIELDS Grant to Support Ammonia Platform Investment Parsippany, N.J., November 4, 2026 - AdvanSix (NYSE: ASIX), a vertically integrated chemistry company serving diverse end markets, today announced its financial results for the third quarter ending September 30, 2026. Third Quarter 2026 Summary "Our third quarter results reflect strong commercial execution and the resilience of our integrated business model as we navigate significant input cost inflation and a dynamic market environment,” said Erin Kane, president and CEO of AdvanSix. "We generated 15% sales growth year-over-year as our teams continued to leverage both formula and market-based pricing mechanisms to offset inflationary raw material costs. While our core caprolactam operating rate continues to exceed global industry averages, reduced production output drove unfavorable fixed cost absorption in the quarter. We are taking decisive actions to enhance cash generation, improve our cost position, and optimize our portfolio while continuing to prudently invest for attractive long-term growth opportunities. We remain focused on executing our strategic priorities and positioning AdvanSix to deliver sustainable long-term value." Summary third quarter 2026 financial results for the Company are included below: 1
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($ in Thousands, Except Earnings Per Share)3Q 2026 3Q 2025 Variance $ Sales $430,807 $374,473 $56,334 Net Income (Loss) (7,555) (2,638) (4,917) Diluted Earnings Per Share (0.28) (0.10) (0.18) Adjusted Diluted Earnings Per Share (0.24) 0.08 (0.32) Adjusted EBITDA 14,643 24,734 (10,091) Adjusted EBITDA Margin % 3.4% 6.6% (320) bps Cash Flow from Operations 47,962 26,588 21,374 Capital Expenditures 18,275 26,522 (8,247) Free Cash Flow 29,687 66 29,621 (1) See “Non-GAAP Measures” included in this press release for non-GAAP reconciliations (2) Net cash provided by operating activities less capital expenditures Sales of $431 million in the quarter increased approximately 15% versus the prior year driven by 17% favorable pricing, partially offset by a 2% decline in volume. Raw material pass-through pricing was up 10% following a net cost increase in benzene and propylene (inputs to cumene which is a key feedstock to our products). Market-based pricing improved by 7% primarily reflecting an increase across all product lines and strong commercial execution amid a higher input cost environment. Lower sales volume was primarily driven by lower caprolactam sales. Sales by product line and approximate percentage of total sales are included below: ($ in Thousands) 3Q 2026 3Q 2025 Sales % of Total Sales % of Total Variance % Nylon $ 104,738 24% $ 79,029 21% 33% Caprolactam 73,072 17% 73,137 20% —% Plant Nutrients 149,334 35% 138,661 37% 8% Chemical Intermediates 103,663 24% 83,646 22% 24% Total $ 430,807 100% $ 374,473 100% 15% Adjusted EBITDA of $14.6 million in the quarter decreased $10.1 million versus the prior year primarily driven by the unfavorable impact of reduced production output and higher raw material costs, partially offset by higher pricing and disciplined cost savings including our non-manpower fixed cost savings initiative. Adjusted earnings per share of ($0.24) decreased $0.32 versus the prior year driven primarily by the factors discussed above. Cash flow from operations of $48.0 million in the quarter increased $21.4 million versus the prior year (1) (1) (1) (1)(2) 2
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primarily due to disciplined working capital performance. Capital expenditures of $18.3 million in the quarter decreased $8.2 million versus the prior year, as expected, driven by continued risk-based prioritization of base investments and progression of growth projects including SUSTAIN. Credit Agreement On August 14, 2026, the Company completed a refinancing of its existing credit facility by entering into a new 5-year $425 million credit facility providing ample liquidity and capital deployment optionality. The new agreement is comprised of a $275 million senior secured revolving credit facility and a $150 million senior secured term loan facility. Outlook • Expect tighter ammonium sulfate supply and demand dynamics into 2027 amid challenged sulfur input cost environment• Acetone spread over propylene costs expected to hold near cycle averages • Continue to optimize Nylon Solutions price over raws spreads and sales volume mix in soft industrial end marketenvironment • Now expect Capital Expenditures of approximately $90 million in 2026 versus $116 million in 2025, reflecting risk-based prioritization of base investments and enterprise programs with continued progression of growth programs includingSUSTAIN • Continue to expect pre-tax income impact of plant turnarounds to be approximately $17 million in 2026 versus $25 million in2025 • Continue to expect 2H 2026 sequential cash flow improvement primarily due to a reduced Capital Expenditures run-rate, working capital tailwinds including our 4Q 2026 pre-buy program in Plant Nutrients, and timing of annual payments paid in1H 2026 "Looking ahead, we remain focused on navigating near-term market dynamics while strengthening our performance and positioning AdvanSix for the future. We are prioritizing disciplined cost management, cash generation and capital deployment while advancing our strategic growth initiatives. We will ensure a well-managed balance sheet as we continue to progress evaluation of our potential DEF growth project as well as Project CENTURY. In addition, our non-manpower fixed cost savings program remains on track while we continue to anticipate 45Q carbon capture tax credits to support improved earnings and cash flow generation moving forward," concluded Kane. Dividend The Company's Board of Directors declared a quarterly cash dividend of $0.16 per share on the Company's common stock. The dividend is payable on December 1, 2026 to stockholders of record as of the close of business on November 17, 2026. Conference Call Information AdvanSix will discuss its results during its investor conference call today starting at 9:30 a.m. ET. To participate on the conference call, dial (844) 855-9494 (domestic) or (412) 858-4602 (international) 3
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approximately 10 minutes before the 9:30 a.m. ET start, and tell the operator that you are dialing in for AdvanSix’s third quarter 2026 earnings call. The live webcast of the investor call as well as related presentation materials can be accessed at http://investors.advansix.com. Investors can hear a replay of the conference call from 12 noon ET on November 4 until 12 noon ET on November 11 by dialing (855) 669-9658 (domestic) or (412) 317-0088 (international). The access code is 3522933. About AdvanSix AdvanSix is a vertically integrated chemistry company that produces essential materials for our customers across diverse end markets. Our value chain of ourfive U.S.-based manufacturing facilities plays a critical role in global supply chains and enables us to innovate and deliver essential products for our customersacross building and construction, fertilizers, agrochemicals, plastics, solvents, packaging, paints, coatings, adhesives, electronics and other end markets. Guidedby our core values of Safety, Integrity, Accountability and Respect, AdvanSix strives to deliver best-in-class customer experiences and differentiated products inthe industries of nylon solutions, plant nutrients, and chemical intermediates. More information on AdvanSix can be found at http://www.advansix.com. Forward Looking Statements This release contains certain statements that may be deemed “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of1934, as amended. All statements, other than statements of historical fact, that address activities, events or developments that our management intends,expects, projects, believes or anticipates will or may occur in the future are forward-looking statements. Forward-looking statements may be identified by wordssuch as "expect," "anticipate," "estimate," “outlook,” "project," "strategy," "intend," "plan," "target," "goal," "may," "will," "should" and "believe" and other variationsor similar terminology and expressions. Although we believe forward-looking statements are based upon reasonable assumptions, such statements involveknown and unknown risks, uncertainties and other factors, many of which are beyond our control and difficult to predict, which may cause the actual results orperformance of the Company to be materially different from any future results or performance expressed or implied by such forward-looking statements. Suchrisks and uncertainties include, but are not limited to: general economic and financial conditions in the U.S. and globally; the potential effects of inflationarypressures, tariffs or the imposition of new tariffs, trade wars, barriers or restrictions, or threats of such actions, changes in interest rates, labor market shortagesand supply chain issues; instability or volatility in financial markets or other unfavorable economic or business conditions caused by geopolitical concerns,including as a result of new or proposed legislation or regulatory, trade or other policies in or impacting the U.S., the conflict between Russia and Ukraine, theconflicts in the Middle East, as well as any related uncertainty in the surrounding region, and the possible expansion of such conflicts; the effect of any of theforegoing on our customers’ demand for our products and our suppliers’ ability to manufacture and deliver our raw materials, including implications of reducedrefinery utilization in the U.S.; our ability to sell and provide our goods and services; the ability of our customers to pay for our products; any closures of our andour customers’ offices and facilities; risks associated with increased phishing, compromised business emails and other cybersecurity attacks, data privacyincidents and disruptions to our technology infrastructure; risks associated with potential use of artificial intelligence in our operations or those of third partyservice providers; risks associated with operating with a reduced workforce; risks associated with our indebtedness including compliance with financial andrestrictive covenants, and our ability to access capital on reasonable terms, at a reasonable cost, or at all, due to economic conditions or otherwise; the impact ofscheduled turnarounds and significant unplanned downtime and interruptions of production or logistics operations as a result of mechanical issues or otherunanticipated events such as fires, severe weather conditions, natural disasters, pandemics, geopolitical conflicts and related events; price fluctuations, costincreases and supply of raw materials; our operations and growth projects requiring substantial capital; growth rates and cyclicality of the industries we serveincluding global changes in supply and demand; failure to develop and commercialize new products or technologies; loss of significant customer relationships;adverse trade and tax policies; extensive environmental, health and safety laws that apply to our operations; hazards associated with chemical manufacturing,storage and transportation; litigation associated with chemical manufacturing and our business operations generally; inability to acquire and integratebusinesses, assets, products or technologies; protection of our intellectual property and proprietary information; prolonged work stoppages as a result of labordifficulties or otherwise; failure to maintain effective internal controls; our ability to declare and pay quarterly cash dividends and the amounts and timing of anyfuture dividends; our ability to repurchase our common stock and the amount and timing of any future repurchases; disruptions in supply chain, transportationand logistics; potential for uncertainty regarding qualification for tax treatment of our spin-off; fluctuations in our stock price; and changes in laws or regulationsapplicable to our business. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release.Such forward-looking statements are not guarantees of future performance, and actual results, developments and business decisions may differ materially fromthose contemplated by such forward-looking statements as a result of a number of risks, uncertainties and other factors including those noted above and thoseidentified in our filings with the Securities and Exchange Commission (SEC), including the risk factors in Part 1, Item 1A of our Annual Report on Form 10-K forthe year ended December 31, 2025, as updated in subsequent reports filed with the SEC. All subsequent written or oral forward-looking statements attributableto us or persons acting on our behalf are qualified in their entirety by this paragraph. We do not undertake to update or revise any of our forward-lookingstatements. 4
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Non-GAAP Financial Measures This press release includes certain non-GAAP financial measures intended to supplement, not to act as substitutes for, comparable GAAP measures. Reconciliations of non-GAAP financial measures to GAAP financial measures are provided in this press release. Investors are urged to consider carefully thecomparable GAAP measures and the reconciliations to those measures provided. Non-GAAP measures in this press release may be calculated in a way that is not comparable to similarly-titled measures reported by other companies. # # # Contacts: Media Investors Janeen Lawlor Adam Kressel (973) 526-1615 (973) 526-1700 janeen.lawlor@advansix.com adam.kressel@advansix.com 5
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AdvanSix Inc. Condensed Consolidated Balance Sheets (Unaudited)(Dollars in thousands, except share and per share amounts) September 30, 2026December 31, 2025 ASSETS Current assets: Cash and cash equivalents $ 22,550 $ 19,766 Accounts and other receivables – net 193,416 154,102 Inventories – net 181,413 236,495 Taxes receivable 22,786 21,605 Other current assets 14,839 8,639 Total current assets 435,004 440,607 Property, plant and equipment – net 962,786 963,718 Operating lease right-of-use assets 140,555 164,494 Goodwill 56,192 56,192 Intangible assets 37,808 40,095 Other assets 45,129 41,042 Total assets $ 1,677,474 $ 1,706,148 LIABILITIES Current liabilities: Accounts payable $ 286,405 $ 284,016 Accrued liabilities 31,411 45,945 Income taxes payable 55 1,100 Operating lease liabilities – short-term 40,409 44,354 Deferred income and customer advances 1,589 14,536 Current portion of long-term debt 3,750 — Total current liabilities 363,619 389,951 Deferred income taxes 150,887 154,061 Operating lease liabilities – long-term 101,695 121,201 Line of credit – long-term 120,000 215,000 Long-term debt 144,727 — Other liabilities 11,131 10,719 Total liabilities 892,059 890,932 STOCKHOLDERS' EQUITY Common stock, par value $0.01; 200,000,000 shares authorized; 33,400,026 shares issued and27,005,655 outstanding at September 30, 2026; 33,177,824 shares issued and 26,864,035outstanding at December 31, 2025 334 332 Preferred stock, par value $0.01; 50,000,000 shares authorized; 0 shares issued and outstandingat September 30, 2026 and December 31, 2025 — — Treasury stock at par (6,394,371 shares at September 30, 2026; 6,313,789 shares atDecember 31, 2025) (64) (63) Additional paid-in capital 146,841 142,932 Retained earnings 629,578 663,019 Accumulated other comprehensive income 8,726 8,996 Total stockholders' equity 785,415 815,216 Total liabilities and stockholders' equity $ 1,677,474 $ 1,706,148 6
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AdvanSix Inc. Condensed Consolidated Statements of Operations (Unaudited) (Dollars in thousands, except share and per share amounts) Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Sales $ 430,807 $ 374,473 $ 1,256,274 $ 1,162,286 Costs, expenses and other: Cost of goods sold 419,602 349,088 1,210,166 1,024,716 Selling, general and administrative expenses 19,196 27,425 63,768 76,250 Interest expense, net 4,027 2,322 9,065 6,119 Other non-operating income, net (890) (815) (1,573) (1,831) Total costs, expenses and other 441,935 378,020 1,281,426 1,105,254 Income (loss) before taxes (11,128) (3,547) (25,152) 57,032 Income tax expense (benefit) (3,573) (909) (5,299) 4,955 Net income (loss) $ (7,555) $ (2,638) $ (19,853) $ 52,077 Earnings per common share Basic $ (0.28) $ (0.10) $ (0.73) $ 1.94 Diluted $ (0.28) $ (0.10) $ (0.73) $ 1.91 Weighted average common shares outstanding Basic 27,077,103 26,927,305 27,035,092 26,887,489 Diluted 27,077,103 26,927,305 27,035,092 27,248,759 7
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AdvanSix Inc. Condensed Consolidated Statements of Cash Flows (Unaudited) (Dollars in thousands) Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Cash flows from operating activities: Net income (loss) $ (7,555)$ (2,638)$ (19,853)$ 52,077 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 21,069 20,327 62,820 58,966 (Gain) loss on disposal of assets 12 — 146 (177) Deferred income taxes (1,285) 7,820 (3,174) 14,466 Stock-based compensation 675 1,632 4,553 5,919 Amortization of deferred financing fees 668 155 972 464 Changes in assets and liabilities, net of business acquisitions: Accounts and other receivables (6,243) (24,977) (39,584) (38,971) Inventories 12,732 12,644 55,082 3,266 Taxes receivable (2,276) (8,515) (1,181) (23,255) Accounts payable 44,338 4,123 21,404 16,546 Income taxes payable (18) (335) (1,045) (998) Accrued liabilities (12,088) 8,352 (14,089) 8,913 Deferred income and customer advances (391) (1,177) (12,947) (36,857) Other assets and liabilities (1,676) 9,177 (10,436) (1,218) Net cash provided by operating activities 47,962 26,588 42,668 59,141 Cash flows from investing activities: Expenditures for property, plant and equipment (18,275) (26,522) (74,925) (88,849) Other investing activities (324) (262) (546) (6,153) Net cash used for investing activities (18,599) (26,784) (75,471) (95,002) Cash flows from financing activities: Proceeds from long-term debt 150,000 — 150,000 — Payment of debt issuance costs (1,549) — (1,549) — Borrowings from line of credit 106,000 85,000 367,500 316,500 Repayments of line of credit (261,000) (75,000) (462,500) (261,500) Payment of line of credit facility fees (2,877) — (2,877) — Principal payments of finance leases (243) (249) (756) (740) Dividend payments (4,320) (4,296) (12,947) (12,876) Purchase of treasury stock (41) (121) (1,438) (1,658) Issuance of common stock — 112 154 267 Net cash provided by (used for) financing activities (14,030) 5,446 35,587 39,993 Net change in cash and cash equivalents 15,333 5,250 2,784 4,132 Cash and cash equivalents at beginning of period 7,217 18,446 19,766 19,564 Cash and cash equivalents at the end of period $ 22,550 $ 23,696 $ 22,550 $ 23,696 Supplemental non-cash investing activities: Capital expenditures included in accounts payable $ 8,310 $ 14,894 8
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AdvanSix Inc. Non-GAAP Measures (Dollars in thousands, except share and per share amounts) Reconciliation of Net Cash Provided by Operating Activities to Free Cash Flow Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Net cash provided by operating activities $ 47,962 $ 26,588 $ 42,668 $ 59,141 Expenditures for property, plant and equipment (18,275) (26,522) (74,925) (88,849) Free cash flow $ 29,687 $ 66 $ (32,257) $ (29,708) Free cash flow is a non-GAAP measure defined as Net cash provided by operating activities less Expenditures for property, plant andequipment. The Company believes that this metric is useful to investors and management as a measure to evaluate our ability to generate cash flow from business operations and the impact that this cash flow has on our liquidity. Reconciliation of Net Income to Adjusted EBITDA and Earnings Per Share to Adjusted Earnings Per Share Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Net income (loss) $ (7,555) $ (2,638) $ (19,853) $ 52,077 Non-cash stock-based compensation 675 1,632 4,553 5,919 Non-cash amortization from acquisitions 532 532 1,595 1,595 Strategic advisory and professional fees — 4,000 — 4,000 Income tax benefit relating to reconciling items (234) (1,378) (1,082) (2,287) Adjusted Net income (loss) (non-GAAP) (6,582) 2,148 (14,787) 61,304 Interest expense, net 4,027 2,322 9,065 6,119 Income tax expense (benefit) - Adjusted (3,339) 469 (4,216) 7,242 Depreciation and amortization - Adjusted 20,537 19,795 61,225 57,371 Adjusted EBITDA (non-GAAP) $ 14,643 $ 24,734 $ 51,287 $ 132,036 Sales $ 430,807 $ 374,473 $ 1,256,274 $ 1,162,286 Adjusted EBITDA Margin (non-GAAP) 3.4% 6.6% 4.1% 11.4% Legal and professional fees associated with strategic regulatory matters and potential inorganic growth options, including costs associatedwith a transaction the Company is no longer pursuing Adjusted EBITDA Margin is defined as Adjusted EBITDA divided by Sales (1) (1) (2) (3) (2) (3) 9
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Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Net income (loss) $ (7,555) $ (2,638) $ (19,853) $ 52,077 Adjusted Net income (loss) (non-GAAP) (6,582) 2,148 (14,787) 61,304 Weighted-average number of common shares outstanding - basic 27,077,103 26,927,305 27,035,092 26,887,489 Dilutive effect of equity awards and other stock-based holdings — — — 361,270 Weighted-average number of common shares outstanding - diluted 27,077,103 26,927,305 27,035,092 27,248,759 EPS - Basic $ (0.28) $ (0.10) $ (0.73) $ 1.94 EPS - Diluted $ (0.28) $ (0.10) $ (0.73) $ 1.91 Adjusted EPS - Basic (non-GAAP) $ (0.24) $ 0.08 $ (0.55) $ 2.28 Adjusted EPS - Diluted (non-GAAP) $ (0.24) $ 0.08 $ (0.55) $ 2.25 The Company believes the non-GAAP financial measures presented in this release provide meaningful supplemental information as they are used by the Company’s management to evaluate the Company’s operating performance, enhance a reader’s understanding of the financial performance of the Company, and facilitate a better comparison among fiscalperiods and performance relative to its competitors, as these non-GAAP measures exclude items that are not considered core to the Company’s operations. 10
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AdvanSix Inc. Appendix (Pre-tax income impact, Dollars in millions) Planned Plant Turnaround Schedule 1Q 2Q 3Q 4Q FY Primary Unit Operation 2017 — ~$10 ~$4 ~$20 ~$34 Sulfuric Acid 2018 ~$2 ~$10 ~$30 — ~$42 Ammonia 2019 — ~$5 ~$5 ~$25 ~$35 Sulfuric Acid 2020 ~$2 ~$7 ~$20 ~$2 ~$31 Ammonia 2021 ~$3 ~$8 — ~$18 ~$29 Sulfuric Acid 2022 ~$1 ~$5 ~$44 — ~$50 Ammonia 2023 ~$2 ~$1 ~$27 — ~$30 Sulfuric Acid 2024 ~$5 ~$3 ~$3 ~$47 ~$58 Ammonia 2025 ~$5 ~$6 — ~$14 ~$25 Sulfuric Acid 2026E — ~$10 — ~$7 ~$17 Ammonia Primarily reflects the impact of fixed cost absorption, maintenance expense, and the purchase of feedstocks which are normally manufactured by the Company. During the multi-site planned plant turnaround, additional required maintenance at our Frankford phenol plant contributed to reducedproduction across our integrated value chain and a delayed ramp to full operating rates at our Hopewell and Chesterfield sites, resulting in an incremental $15 million unfavorable impact to pre-tax income, which is reflected in this amount and is inclusive of fixed cost absorption, highermaintenance expense and lost sales. During the multi-site planned plant turnaround, additional required maintenance at our Hopewell plant contributed to reduced production across our integrated value chain and a delayed ramp to full operating rates, resulting in an incremental approximately $17 million unfavorableimpact to pre-tax income, which is reflected in this amount and is inclusive of fixed cost absorption, higher maintenance expense, and lost sales. (4) (5) (6) (4) (5) (6) 11