Interim report
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Note: This document has been translated from the Japanese original for reference purposes only. In the event of any discrepan cy between this translated document and the Japanese original, the original shall prevail. Consolidated Financial Results for the Three Months Ended June 30, 2026 [Japanese GAAP] August 4, 2026 Company name: TOSOH CORPORATION Stock exchange listing: Tokyo Code number: 4042 URL: https://www.tosoh.co.jp/ Representative: Mamoru Kuwada, Representative Director, President Contact: Masashige Sakata, Vice President, General Manager of Corporate Control & Accounting Telephone: +81-3-6636-3713 Scheduled date to commence dividend payments: - Availability of supplementary briefing material on quarterly financial results: Yes Scheduled quarterly financial results briefing session: Yes (for institutional investors and analysts) (Amounts of less than one million yen are rounded down .) 1. Consolidated Financial Results for the Three Months Ended June 30, 2026 (April 1, 2026 to June 30, 2026) (1) Consolidated Operating Results (% indicates changes from the previous corresponding period.) Net sales Operating income Ordinary income Income attributable to owners of parent Three months ended Million yen % Million yen % Million yen % Million yen % June 30, 2026 274,174 11.8 31,183 93.9 34,302 143.6 19,456 198.0 June 30, 2025 245,128 (3.1) 16,078 (18.9) 14,082 (48.5) 6,529 (59.8) (Note) Comprehensive income Three months ended June 30, 2026: ¥ 27,683 million [ - %] Three months ended June 30, 2025: ¥ 1,803 million [ (92.7) %] Basic earnings per share Diluted earnings per share Three months ended Yen Yen June 30, 2026 63.19 63.19 June 30, 2025 20.50 20.50 (2) Consolidated Financial Position Total assets Net assets Equity ratio As of Million yen Million yen % June 30, 2026 1,468,941 928,684 57.3 March 31, 2026 1,408,950 919,141 59.0 (Reference) Equity: As of June 30, 2026: ¥ 841,178 million As of March 31, 2026: ¥ 831,752 million
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2. Dividends Annual dividends 1st quarter-end 2nd quarter-end 3rd quarter-end Year-end Total Yen Yen Yen Yen Yen Fiscal year ended March 31, 2026 - 50.00 - 50.00 100.00 Fiscal year ending March 31, 2027 - Fiscal year ending March 31, 2027 (Forecast) 50.00 - 50.00 100.00 (Note) Revision to the forecast for dividends announced most recently: No 3. Consolidated Financial Results Forecasts for the Fiscal Year Ending March 31, 2027 (April 1, 2026 to March 31, 2027) (% indicates changes from the previous corresponding period.) (Percentages indicate year-on-year changes.) Net sales Operating income Ordinary income Income attributable to owners of parent Basic earnings per share Million yen % Million yen % Million yen % Million yen % Yen Six months ending September 30, 2026 580,000 16.2 50,000 11.8 52,000 13.7 28,000 279.5 90.94 Full year 1,170,000 14.7 105,000 9.9 107,000 0.2 59,000 41.8 191.63 (Note) Revision to the financial results forecast announced most recently: Yes * Notes (1) Significant changes in the scope of consolidation during the period: No (2) Accounting policies adopted specially for the preparation of quarterly consolidated financial statements: Yes (3) Changes in accounting policies, changes in accounting estimates, and retrospective restatement 1) Changes in accounting policies due to revisions to accounting standards: No 2) Changes in accounting policies other than 1) above: No 3) Changes in accounting estimates: No 4) Retrospective restatement: No (4) Total number of issued shares (common shares) 1) Total number of issued shares at the end of the period (including treasury shares) June 30, 2026: 325,080,956 shares March 31, 2026: 325,080,956 shares 2) Number of treasury shares at the end of the period June 30, 2026: 17,191,543 shares March 31, 2026: 17,190,410 shares 3) Average number of shares outstanding during the period Three months ended June 30, 2026: 307,890,006 shares Three months ended June 30, 2025: 318,507,711 shares * Review of the attached consolidated quarterly financial results by certified public accountants or an audit firm: No * Explanations regarding appropriate use of financial results forecasts and other special notes (Cautionary statement on forward-looking statements) The forward-looking statements, including financial results forecasts, contained in these materials are based on information currently available to the Company and certain assumptions that the Company considers reasonable, and may be substantially different from the actual performance because of various factors that may arise from now on. Please refer to page 5 of the Contents for Accompanying Materials for further information on the above forecasts. (How to obtain the supplementary briefing materials) The presentation materials are available on the Company's website.
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- 1 - Contents for Accompanying Materials 1. Qualitative Information on Quarterly Consolidated Financial Results .......................................................................................... P.2 (1) Explanation regarding Operating Results ................................................................................................................................ P.2 (2) Explanation regarding Financial Position ................................................................................................................................ P.4 (3) Explanation regarding Cash Flows .......................................................................................................................................... P.4 (4) Explanation regarding Research and Development Expenses ................................................................................................. P.4 (5) Explanation regarding Consolidated Financial Results Forecast and Other Forward-Looking Statements ............................. P.5 2. Quarterly Consolidated Financial Statements ............................................................................................................................... P.6 (1) Quarterly Consolidated Balance Sheets ................................................................................................................................... P.6 (2) Quarterly Consolidated Statements of Income and Comprehensive Income ........................................................................... P.8 (3) Quarterly Consolidated Statements of Cash Flows .................................................................................................................. P.10 (4) Notes to Quarterly Consolidated Financial Statements ............................................................................................................ P.11 (Notes on Assumption of Going Concern) ................................................................................................................................ P.11 (Notes on Significant Changes in Shareholders' Equity) ........................................................................................................... P.11 (Accounting Policies Adopted Specially for the Preparation of Quarterly Consolidated Financial Statements) ....................... P.11 (Segment Information) .............................................................................................................................................................. P.12 3. Additional Information .................................................................................................................................................................. P.13
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- 2 - 1. Qualitative Information on Quarterly Consolidated Financial Results (1) Explanation regarding Operating Results During the period under review, the global economy was supported by expanding AI-related investment and demand, while the outlook remained uncertain due to rising energy prices and disruption in logistics and marine transportation reflecting heightened tensions in the Middle East. In the U.S., AI-related investment and personal consumption supported a firm economy. In China, public investment, high-tech manufacturing, and exports provided support, while weak domestic demand and the sluggish real estate market continued. In Japan, AI-related demand supported production activity, while concerns grew over the impact on corporate earnings and households through higher energy procurement costs and other factors. Under these circumstances, the Company’s net sales increased ¥29.0 billion (11.8%) year-on-year to ¥274.2 billion (US$1.7 billion), over the first three months of the Company’s 2027 fiscal year, which extends from April 1, 2026, to March 31, 2027. This incr ease was attributable mainly to higher selling prices reflecting the rise in naphtha prices and overseas market conditions for major products amid heightened tensions in the Middle East, as well as the progressively weaker yen. The Company's consolidated operating income increased ¥15.1 billion (93.9%) year -on-year to ¥31.2 billion (US$195.5 million), owing to a substantial improvement in favorable inventory valuation caused by higher naphtha prices , and an increase in shipments of Value-Added Chemicals and Advanced Materials products. Non-operating income and expenses improved as foreign exchange gains were recorded due to fluctuations in foreign exchange rates. As a result, ordinary income increased ¥20.2 billion (143.6%) year-on-year to ¥34.3 billion (US$215.0 million). Income attributable to owners of parent increased ¥12.9 billion (198.0%) year-on-year to ¥19.5 billion (US$121.9 million). Results by business segment are as follows: Effective from the first quarter of the current fiscal year ending March 2027, the Company changed its reportable segments from the previous four segments— Petrochemical, Chlor-alkali, Specialty, and Engineering—to five segments: Basic Chemicals, Value-Added Chemicals, Bioscience, Advanced Materials, and Water Treatment. Year-on-year comparisons are based on figures for the same period of the previous fiscal year reclassified according to the new segment classification. (Billion yen) Net sales Operating income (loss) Three months ended June 30, 2025 Three months ended June 30, 2026 Change Three months ended June 30, 2025 Three months ended June 30, 2026 Change Basic Chemicals 111.7 124.8 13.1 (3.4) 5.7 9.0 Value-Added Chemicals 37.6 42.9 5.2 3.9 8.2 4.3 Total for Chemical Chain Business 149.4 167.7 18.3 0.5 13.9 13.3 Basic Chemicals Ethylene, propylene, and cumene shipments decreased due to lower production volume reflecting scheduled maintenance at the Yokkaichi Complex’s ethylene plant and other facilities, as well as production adjustments in line with feedstock naphtha and propylene demand. Moreover, selling prices for ethylene and propylene increased due to the rise in naphtha prices. Selling prices for cumene also increased due to improvement in overseas market conditions. Polyethylene resin shipments increased year-on-year, as demand was brought forward due to the impact of tensions in the Middle East and sales of HDPE resin for semiconductor applications and L -LDPE resin for laminate applications remained firm. Selling prices also increased due to the rise in naphtha prices. Caustic soda shipments increased due to higher production volume reflecting differences in the scale of scheduled maintenance at the Nanyo Complex, but export prices declined due to the decline in overseas market conditions. Vinyl chloride monomer (VCM) shipments decreased due to lower production volume caused by concerns over feedstock procurement reflecting tensions in the Middle East. Polyvinyl chloride (PVC) resin shipments increased both in Japan and overseas. Moreover, overseas selling prices of VCM and PVC increased due to improvement in overseas market conditions. Cement shipments decreased in Japan due to weak demand, but domestic selling prices increased. Methylene diphenyl diisocyanate (MDI) shipments increased due to higher production volume reflecting differences in the scale of scheduled maintenance at the Nanyo Complex, and selling prices increased as overseas market conditions improved due to the impact of tensions in the Middle East. As a result, net sales increased ¥13.1 billion (11.7%) year-on-year to ¥124.8 billion (US$782.1 million). Operating income increased ¥9.0 billion year -on-year to ¥5.7 billion (US$35.5 million). This was because a substantial improvement in favorable inventory valuation outweighed a decrease in shipments of ethylene, propylene, cumene and other products and deteriorated terms of trade due to higher prices in raw materials and fuels.
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- 3 - Value-Added Chemicals Chloroprene rubber shipments increased due to the impact of tensions in the Middle East. Moreover, selling prices increased because butadiene market conditions also rose due to the impact of tensions in the Middle East. Hexamethylene diisocyanate (HDI) hardeners saw increased shipments and higher selling prices due to stronger demand associate d with tensions in the Middle East and improvement in overseas market conditions. Ethyleneamine shipments increased as inquiries in Asia rose due to the impact of tensions in the Middle East. Moreover, selling prices increased due to the impact of foreign exchange rates. As a result, net sales increased ¥5.2 billion (13.9%) year -on-year to ¥42.9 billion (US$268.8 million). Operating income increased ¥4.3 billion (109.1%) year-on-year to ¥8.2 billion (US$51.4 million). This was due to an increase in shipments of ethyleneamine and chloroprene rubber, as well as an improvement in favorable inventory valuation. (Billion yen) Net sales Operating income Three months ended June 30, 2025 Three months ended June 30, 2026 Change Three months ended June 30, 2025 Three months ended June 30, 2026 Change Bioscience 15.4 15.4 0.0 4.6 5.7 1.1 Advanced Materials 30.1 34.3 4.2 2.5 3.2 0.7 Water Treatment 37.8 42.0 4.2 7.2 6.6 (0.6) Total for Advanced Technologies Business 83.3 91.7 8.4 14.3 15.5 1.2 Bioscience Among separation-related products, shipments of packing material for liquid chromatography decreased in Europe. In diagnostic-related products, shipments of in vitro diagnostic reagents increased in Japan. Moreover, shipments of related reagents for automated hemoglobin analyzers increased in Europe. As a result, net sales increased ¥0.0 billion (0.2%) year-on-year to ¥15.4 billion (US$96.5 million). Operating income increased ¥1.1 billion (24.0%) year-on-year to ¥5.7 billion (US$35.7 million). This was because improved terms of trade due to the impact of foreign exchange rates and changes in the product mix outweighed a decrease in shipments of packing material for liquid chromatography. Advanced Materials High-silica zeolite shipments increased, driven by automotive and environmental applications in Japan and mainly automotive applications and petrochemical catalyst applications in Asia overseas. Although shipments decreased in Europe and the U.S., overall shipments increased. Zirconia shipments increased for decorative applications and dental applications in Europe. Silica glass shipments for semiconductor applications increased in Japan and East Asia against the backdrop of strong AI -related demand. Although shipments to North America decreased, overall shipments increased. Sputtering target shipments in Japan were unchanged year-on-year, while overseas shipments for semiconductor applications increased. Electrolytic manganese dioxide shipments for dry-cell battery applications increased in Japan, but decreased overseas, resulting in an overall decrease in shipments. As a result, net sales increased ¥4.2 billion (13.8%) year -on-year to ¥34.3 billion (US$215.0 million). Operating income increased ¥0.7 billion (29.1%) year-on-year to ¥3.2 billion (US$20.1 million). This was because an increase in shipments of silica glass, high - silica zeolite and other products outweighed higher fixed costs.
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- 4 - Water Treatment The Group’s water treatment engineering business continued to maintain high net sales in Taiwan, where orders for large -scale semiconductor-related projects continued, while large -scale projects in the U.S. progressed steadily. In addition, sales of solution projects, such as equipment ownership services, remained favorable. As a result, net sales increased ¥4.2 billion (11.1%) year -on-year to ¥42.0 billion (US$263.2 million). Operating income decreased ¥0.6 billion (8.7%) year-on-year to ¥6.6 billion (US$41.4 million) due to a decline in profit margin reflecting the absence of highly profitable plant projects recorded in the same period of the previous fiscal year, as well as increases in expenses including personnel costs and IT-related expenditures. Other Net sales from other businesses, including transportation and warehousing, construction and maintenance, inspection and analysis, and information processing , increased ¥2.3 billion (18.6%) year -on-year to ¥14.8 billion (US$92.7 million), and operating income increased ¥0.6 billion (45.1%) year-on-year to ¥1.9 billion (US$11.9 million). (2) Explanation regarding Financial Position The Company’s total assets increased ¥60 .0 billion from the end of the previous period to ¥1,468.9 billion (US$9.2 billion). The increase was primarily due to an increase in cash and deposits, notes and accounts receivable, contract assets, property, plant and equipment. Liabilities increased ¥50.4 billion from the end of the previous period to ¥540.3 billion (US$ 3.4 billion). The increase was primarily due to increases in short-term borrowings and long-term borrowings. Net assets increased ¥9.5 billion from the end of the previous period to ¥928.7 billion (US$ 5.8 billion). The increase was primarily due to the recording of quarterly income attributable to owners of parent and an increase in valuation difference on available-for-sale securities. (3) Explanation regarding Cash Flows Cash and cash equivalents increased ¥13.6 billion from the end of the previous period to ¥190.2 billion (US$1.2 billion). Net cash flow provided by operating activities amounted to an inflow of ¥0.4 billion (US$2.3 million). Although income before income taxes increased, cash inflow decreased ¥36.2 billion compared with the previous fiscal year, primarily due to increases in accounts receivable and inventories, as well as increases in income taxes paid. Net cash flow used in investing activities saw an outflow of ¥20.0 billion (US$ 125.1 million). Due to a decrease in payments for capital expenditures and other factors, total payments decreased by ¥5.8 billion compared with the previous fiscal year. As a result, free cash flow decreased ¥30.4 billion to an outflow of ¥19.6 billion. (US$122.8 million). Net cash provided by financing activities resulted in an inflow of ¥31.6 billion (US$ 197.8 million). Cash inflow increased ¥35.0 billion compared with the previous fiscal year, primarily due to increases in short-term borrowings and long-term borrowings. (4) Explanation regarding Research and Development Expenses Total Research and Development (R&D) Expenses for the period under review came to approximately ¥6.1 billion (US$38.5 million). No significant changes occurred in the Group’s research and development activities during the period under review.
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- 5 - (5) Explanation Regarding Consolidated Financial Results Forecast and Other Forward-Looking Statements In light of the information currently available, the Company has made the following revisions to the forecast previously announced as “undetermined” on May 13, 2026. The assumptions for the first half of fiscal year end ing March 31, 2027, in our full -year forecasts are a domestic naphtha price of ¥104,250/kL and an exchange rate of ¥ 159.8/US$. The assumptions for second half of fiscal year end ing March 31, 202 7, in our full -year forecasts are a domestic naphtha price of ¥77,000/kL and an exchange rate of ¥160/US$. Revisions to Consolidated Financial Results Forecast for the Six Months Ended September 30, 2026 (April 1, 2026 to September 30, 2026) Net sales Operating income Ordinary income Income attributable to owners of parent Basic earnings per share Previous forecast (A) Million yen Million yen Million yen Million yen Yen － － － － － Revised forecast (B) 580,000 50,000 52,000 28,000 90.94 Change (B-A) － － － － － Rate of change (%) － － － － － Reference: Results for the six months ended September 30, 2025 499,139 44,742 45,741 7,377 23.21 Revisions to Consolidated Financial Results Forecast for the Fiscal Year Ending March 31, 2027 (April 1, 2026 to March 31, 2027) Net sales Operating income Ordinary income Income attributable to owners of parent Basic earnings per share Previous forecast (A) Million yen Million yen Million yen Million yen Yen － － － － － Revised forecast (B) 1,170,000 105,000 107,000 59,000 191.63 Change (B-A) － － － － － Rate of change (%) － － － － － Reference: Results for the previous fiscal year (ended March 31, 2026) 1,019,917 95,532 106,752 41,615 132.40 For details, please refer to “ Notice Regarding Revision s to Consolidated Financial Results Forecast for the Fiscal Year Ending March 31, 2027” release on the same day as this release.
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- 6 - 2. Quarterly Consolidated Financial Statements (1) Quarterly Consolidated Balance Sheets (Million yen) As of March 31, 2026 As of June 30, 2026 Assets Current assets Cash and deposits 179,616 191,365 Notes and accounts receivable - trade, and contract assets 280,319 292,247 Electronically recorded monetary claims - operating 10,237 12,611 Merchandise and finished goods 148,360 155,923 Work in process 16,029 19,656 Raw materials and supplies 79,062 79,053 Other 85,364 85,438 Allowance for doubtful accounts (924) (933) Total current assets 798,066 835,362 Non-current assets Property, plant and equipment Machinery, equipment and vehicles, net 126,643 169,889 Land 69,321 69,831 Other, net 227,790 194,967 Total property, plant and equipment 423,755 434,689 Intangible assets 14,519 15,122 Investments and other assets Investment securities 80,561 86,533 Retirement benefit asset 63,400 63,701 Other 29,051 33,934 Allowance for doubtful accounts (402) (402) Total investments and other assets 172,609 183,766 Total non-current assets 610,884 633,578 Total assets 1,408,950 1,468,941
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- 7 - (Million yen) As of March 31, 2026 As of June 30, 2026 Liabilities Current liabilities Notes and accounts payable - trade 108,852 110,844 Short-term borrowings 144,678 186,120 Income taxes payable 20,387 14,444 Provisions 18,143 12,033 Other 62,460 68,471 Total current liabilities 354,523 391,913 Non-current liabilities Long-term borrowings 84,232 96,017 Provisions 1,847 1,072 Retirement benefit liability 18,700 18,792 Other 30,505 32,460 Total non-current liabilities 135,286 148,343 Total liabilities 489,809 540,256 Net assets Shareholders' equity Share capital 55,173 55,173 Capital surplus 44,468 44,477 Retained earnings 692,473 696,534 Treasury shares (34,416) (34,419) Total shareholders' equity 757,698 761,765 Accumulated other comprehensive income Valuation difference on available-for-sale securities 25,158 29,202 Foreign currency translation adjustment 26,176 28,184 Remeasurements of defined benefit plans 22,719 22,027 Total accumulated other comprehensive income 74,054 79,413 Share acquisition rights 40 40 Non-controlling interests 87,347 87,465 Total net assets 919,141 928,684 Total liabilities and net assets 1,408,950 1,468,941
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- 8 - (2) Quarterly Consolidated Statements of Income and Comprehensive Income Quarterly Consolidated Statements of Income (For the three months) (Million yen) For the three months ended June 30, 2025 For the three months ended June 30, 2026 Net sales 245,128 274,174 Cost of sales 188,455 199,549 Gross profit 56,672 74,624 Selling, general and administrative expenses 40,593 43,441 Operating income 16,078 31,183 Non-operating income Interest income 281 273 Dividend income 898 895 Foreign exchange gains - 1,665 Share of profit of entities accounted for using equity method 559 944 Other 756 901 Total non-operating income 2,495 4,679 Non-operating expenses Interest expenses 819 1,373 Foreign exchange losses 3,188 - Other 484 187 Total non-operating expenses 4,491 1,560 Ordinary income 14,082 34,302 Extraordinary income Gain on sale of non-current assets 4 20 Gain on sale of investment securities 1,627 - Gain on sale of shares of subsidiaries and associates 74 - Total extraordinary income 1,705 20 Extraordinary losses Loss on sale of non-current assets 3 1 Loss on retirement of non-current assets 458 1,124 Impairment losses - 21 Total extraordinary losses 462 1,147 Income before income taxes 15,325 33,175 Income taxes 6,477 11,197 Net income 8,847 21,978 Income attributable to non-controlling interests 2,318 2,521 Income attributable to owners of parent 6,529 19,456
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- 9 - Quarterly Consolidated Statements of Comprehensive Income (For the three months) (Million yen) For the three months ended June 30, 2025 For the three months ended June 30, 2026 Net income 8,847 21,978 Other comprehensive income Valuation difference on available-for-sale securities (339) 4,074 Foreign currency translation adjustment (6,245) 1,473 Remeasurements of defined benefit plans, net of tax (332) (726) Share of other comprehensive income of entities accounted for using equity method (127) 884 Total other comprehensive income (7,044) 5,705 Comprehensive income 1,803 27,683 Breakdown of comprehensive income Comprehensive income attributable to owners of parent 397 24,815 Comprehensive income attributable to non-controlling interests 1,405 2,867
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- 10 - (3) Quarterly Consolidated Statements of Cash Flows (Million yen) For the three months ended June 30, 2025 For the three months ended June 30, 2026 Cash flows from operating activities Income before income taxes 15,325 33,175 Depreciation 12,049 12,500 Impairment losses - 21 Change in retirement benefit assets and liabilities (634) (1,270) Interest and dividend income (1,180) (1,168) Interest expenses 819 1,373 Foreign exchange losses (gains) 327 (345) Share of loss (profit) of entities accounted for using equity method (559) (944) Loss (gain) on sale of non-current assets (0) (19) Loss on retirement of non-current assets 458 1,124 Loss (gain) on sale of investment securities (1,627) - Loss (gain) on sale of shares of subsidiaries and associates (74) - Decrease (increase) in accounts receivable - trade, and contract assets 14,287 (13,141) Decrease (increase) in inventories (349) (10,725) Increase (decrease) in trade payables (11,922) 652 Other, net 16,354 (5,041) Subtotal 43,275 16,191 Interest and dividends received 2,161 2,049 Interest paid (716) (1,116) Income taxes paid (8,209) (16,762) Net cash provided by (used in) operating activities 36,511 360 Cash flows from investing activities Purchase of non-current assets (26,489) (16,592) Proceeds from sale of non-current assets 1 29 Purchase of investment securities (1) (122) Proceeds from sale and redemption of investment securities 1,874 - Loan advances (161) (3,357) Proceeds from collection of loans receivable 434 200 Other, net (1,398) (114) Net cash provided by (used in) investing activities (25,739) (19,957) Cash flows from financing activities Net increase (decrease) in short-term borrowings 10,401 36,325 Proceeds from long-term borrowings 6,930 18,800 Repayments of long-term borrowings (2,372) (5,097) Dividends paid (15,930) (15,405) Dividends paid to non-controlling interests (2,200) (2,620) Other, net (305) (446) Net cash provided by (used in) financing activities (3,478) 31,556 Effect of exchange rate change on cash and cash equivalents (2,596) 1,645 Net increase (decrease) in cash and cash equivalents 4,697 13,605 Cash and cash equivalents at beginning of period 138,849 176,571 Cash and cash equivalents at end of period 143,546 190,176
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- 11 - (4) Notes to Quarterly Consolidated Financial Statements (Notes on Assumption of Going Concern) Not applicable. (Notes on Significant Changes in Shareholders' Equity) Not applicable. (Accounting Policies Adopted Specially for the Preparation of Quarterly Consolidated Financial Statements) (Calculation of Tax Expenses) Tax expenses are calculated by reasonably estimating the effective tax rate after the application of tax effect accounting to income before income taxes for the fiscal year including the three months ended June 30, 2026, and multiplying income before income taxes by this estimated effective tax rate. However, for those companies that would be significantly irrational if tax expenses were calculated using the estimated effective tax rate, the results calculated using the statutory tax rate were recorded. Income taxes-deferred are included in income taxes.
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- 12 - (Segment Information) Ⅰ For the three months ended June 30, 2025 (From April 1, 2025 to June 30, 2025) 1. Net Sales and Income (Loss) by Segment (Million yen) Basic Chemicals Value- Added Chemicals Bioscience Advanced Materials Water Treatment Other (1) Total Adjustment Figures in consolidated statements (2) Net sales External customers 111,714 37,642 15,410 30,134 37,781 12,444 245,128 － 245,128 Inter-segment 16,945 7,032 217 526 570 20,652 45,944 (45,944) － Total 128,660 44,675 15,627 30,661 38,351 33,096 291,072 (45,944) 245,128 Segment income (loss) (3,387) 3,920 4,627 2,454 7,181 1,282 16,078 － 16,078 Notes (1) "Other" is an additional category for service-related business, such as transportation and warehousing, construction and maintenance, inspection and analysis, and information processing. (2) Segment income(loss) is equal to operating income(loss) of quarterly consolidated statements of income. 2. Information on impairment loss on fixed assets and goodwill by segment Not applicable. Ⅱ For the three months ended June 30, 2026 (From April 1, 2026 to June 30, 2026) 1. Net Sales and Income by Segment (Million yen) Basic Chemicals Value- Added Chemicals Bioscience Advanced Materials Water Treatment Other (1) Total Adjustment Figures in consolidated statements (2) Net sales External customers 124,827 42,861 15,439 34,307 41,983 14,755 274,174 － 274,174 Inter-segment 21,093 8,919 257 656 378 25,432 56,737 (56,737) － Total 145,921 51,781 15,696 34,963 42,361 40,187 330,912 (56,737) 274,174 Segment income 5,661 8,197 5,738 3,169 6,555 1,861 31,183 － 31,183 Notes (1) "Other" is an additional category for service-related business, such as transportation and warehousing, construction and maintenance, inspection and analysis, and information processing. (2) Segment income is equal to operating income of quarterly consolidated statements of income. 2. Information on impairment loss on fixed assets and goodwill by segment Not applicable. 3. Disclosure of changes in reportable segments Effective from the first quarter of the current fiscal year ending March 2027, the Company changed its reportable segments from the previous four segments — “Petrochemical”, “Chlor-alkali”, “Specialty”, and “Engineering” — to five segments — "Basic Chemicals”, “Value-Added Chemicals”, “Bioscience”, “Advanced Materials”, and “Water Treatment”. Year-on- year comparisons are based on figures for the same period of the previous fiscal year reclassified according to the new segment classification.
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3. Additional information Summary of Consolidated Operating Results for the Three Months ended June 30, 2026 (1) Operating Results (Billion yen) (Note) Amounts less than 0.1 billion yen are rounded off. (2) Business and Financial Fundamentals (3) Net Sales and Operating Income by Business Segment (Billion yen) (Note) Amounts less than 0.1 billion yen are rounded off. August 4 , 2026 Tosoh Corporation Three months ended Three months ended Change Fiscal year ended Fiscal year ended June 30, 2025 June 30, 2026 March 31, 2026 Net sales 245.1 274.2 29.0 1,019.9 1,170.0 March 31, 2027 (4.1.25–6.30.25) (4.1.26–6.30.26) (4.1.25–3.31.26) (4.1.26–3.31.27) (Actual) (Actual) (Actual) (Forecast) Ordinary income 14.1 34.3 20.2 106.8 107.0 Operating income 16.1 31.2 15.1 95.5 105.0 Basic earnings per share (¥) 20.50 63.19 42.69 132.40 191.63 Income attributable to owners of parent 6.5 19.5 12.9 41.6 59.0 (4.1.26–6.30.26) (4.1.25–3.31.26) (4.1.26–3.31.27) (Actual) (Actual) (Actual) (Forecast) Three months ended Three months ended Change Fiscal year ended Fiscal year ended June 30, 2025 June 30, 2026 March 31, 2026 March 31, 2027 (4.1.25–6.30.25) Exchange rate (¥/EUR) Average TTM 163.8 185.4 21.6 174.6 185.1 Exchange rate (¥/US$) Average TTM 144.6 159.6 15.0 150.7 159.9 Domestic standard naphtha price (¥/kl) 66,300 118,500 52,200 65,200 90,625 Volume effect Price effect Terms of trade Fixed costs,etc. Breakdown of change Three months ended Three months ended ChangeJune 30, 2025 June 30, 2026 (4.1.25–6.30.25) (4.1.26–6.30.26) (Actual) (Actual) - (0.2) 17.7 - - (0.4) - (4.6) (0.9) 10.4 - 3.3 2.2 -3.0 1.2 Value-Added Chemicals Net sales 37.6 42.9 5.2 Operating income 3.9 8.2 4.3 (0.9) - 1.8 (0.4) (1.2) 13.70.8 - 1.0 - 19.8 - - (1.5) - (0.6) - 0.0 (0.0) (0.0) (1.2) - (0.2) - 3.1 1.1 - 1.9 - 4.2 0.0 - Basic Chemicals Net sales 111.7 124.8 13.1 Operating income (3.4) 5.7 9.0 18.3 Operating income 0.5 13.9 13.3 Bioscience Net sales 15.4 15.4 0.0 Operating income 4.6 5.7 1.1 Subtotal for Chemical Chain Business Net sales 149.4 167.7 30.1 34.3 4.2 Operating income 2.5 3.2 0.7 Water Treatment Net sales 37.8 42.0 4.2 Operating income 7.2 6.6 (0.6) Advanced Materials Net sales 1.9 0.6 Subtotal for Advanced Technologies Business Net sales 83.3 91.7 8.4 Operating income 14.3 15.5 1.2 6.3 2.1 - - 1.1 - 1.8 (1.6) Total Net sales 245.1 274.2 29.0 Operating income 16.1 31.2 15.1 Other Net sales 12.4 14.8 2.3 Operating income 1.3 2.4 - 0.6 12.1 1.6 0.7 - - 0.6 - 0.0 0.0 6.4 22.7 - - - 13 -
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(4) Consolidated Financial Results Forecast (Billion yen) (Note) Amounts less than 0.1 billion yen are rounded off. (Note) As a result of a review of the business jurisdiction of certain operations accompanying the segment changes from the current fiscal year, some figures for the fiscal year 2026 have been revised from the reference figures announced on May 13. March 31, 2026 (4.1.25–3.31.26) Fiscal year ended Fiscal year ended March 31, 2027 First half of fiscal year ended March 31, 2027 Second half of fiscal year ended March 31, 2027 (4.1.26–3.31.27) (Actual) (Forecast) Change Half-yearly Operating income (loss) 0.1 (2.7) (2.8) (3.1) 0.4 Net sales 450.1 519.3 69.3 264.7 Basic Chemicals Operating income 25.7 27.2 1.5 14.6 12.6 254.6 697.7 92.6 356.3 Value-Added Chemicals Net sales 155.0 178.3 23.3 91.6 86.8 Bioscience Net sales 68.2 73.9 5.7 34.3 39.5 Subtotal for Chemical Chain Business Operating income 19.3 21.8 2.5 10.9 10.9 341.3 Operating income 25.8 24.5 (1.3) 11.5 13.0 Water Treatment Net sales 176.9 200.0 23.1 90.0 110.0 Operating income 6.4 13.7 7.3 6.8 6.9 Advanced Materials Net sales 115.3 143.3 28.0 70.4 73.0 Operating income 38.1 40.5 2.4 18.0 22.6 222.5 Operating income 63.8 76.1 12.2 35.7 40.4 Net sales 360.4 Net sales 605.1 Other Net sales 54.4 55.1 0.7 29.0 26.2 Subtotal for Advanced Technologies Business Operating income 5.9 4.5 (1.4) 2.9 1.6 417.2 56.8 194.7 Operating income 95.5 105.0 9.5 50.0 55.0 Total Net sales 1,019.9 1,170.0 150.1 580.0 590.0 - 14 -