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 discrepancy between this translated document and the Japanese original , the original shall prevail . August 6 , 2026 Company name : Listing : Consolidated Financial Results for the Six Months Ended June 30 , 2026 ( Under Japanese GAAP ) SUMCO Corporation Tokyo Stock Exchange https://www.sumcosi.com/english/ Jiro Ryuta , Representative Director , President Securities code : 3436 URL : Representative : Inquiries : Telephone : Takayuki Komori , General Manager of Public Relations & IR Department + 81-3-5444-3915 Scheduled date to file semi - annual securities report : Scheduled date to commence dividend payments : Preparation of supplementary material on financial results : Holding of financial results briefing : August 7 , 2026 September 3 , 2026 Yes Yes ( for institutional investors and security analysts ) ( Yen amounts are rounded down to millions . ) 1. Consolidated financial results for the six months ended June 30 , 2026 ( from January 1 , 2026 to June 30 , 2026 ) ( 1 ) Consolidated operating results ( cumulative ) ( Percentages indicate year - on - year changes . ) Profit attributable to Net sales Operating profit Ordinary profit owners of parent Six months ended Millions of yen % Jun . 30 , 2026 Jun . 30 , 2025 215,016 205,372 4.7 3.6 Millions of yen ( 6,363 ) 7,457 % Millions of yen % Millions of yen % ( 64.2 ) Note : Comprehensive income For the six months ended Jun . 30 , 2026 : For the six months ended Jun . 30 , 2025 : ( 12,179 ) 4,720 ¥ ( 6,786 ) million [ − % ] ¥ 2,059 million [ ( 93.7 ) % ] ( 12,895 ) ( 76.9 ) 3,081 ( 75.6 ) Basic earnings per share Diluted earnings per share Six months ended Yen Yen Jun . 30 , 2026 Jun . 30 , 2025 ( 36.87 ) 8.81 ( 2 ) Consolidated financial position As of Jun . 30 , 2026 Dec. 31 , 2025 Reference : Total assets Net assets Equity - to - asset ratio Millions of yen 1,136,685 1,127,966 Millions of yen % 641,067 50.0 647,785 51.3 Equity As of Jun . 30 , 2026 : As of Dec. 31 , 2025 : ¥ 568,156 million ¥ 578,379 million
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2. Cash dividends Annual dividends per share First quarter-end Second quarte r-end Third quarte r-end Fiscal yea r-end Total Yen Yen Yen Yen Yen Fiscal year ended Dec. 31, 2025 － 10.00 － 10.00 20.00 Fiscal year ending Dec. 31, 2026 － 10.00 Fiscal year ending Dec. 31, 2026 (Forecast) － － － Note: (1) Revisions to the forecast of cash dividends most recently announced: None (2) Year-end dividend per share for the fiscal year ending Dec. 31, 2026 is not determined. 3. Consolidated financial results fo recasts for the nine months ending September 30, 2026 (from January 1, 2026 to September 30, 2026) (Percentages indicate year-on-year changes.) Net sales Operating profit Ordinary profit Profit attributable to owners of parent Basic earnings per share Nine months ending Millions of yen % Millions of yen % Millions of yen % Millions of yen % Yen Sep. 30, 2026 333,000 9.4 (6,300) － (11,100) － (12,800) － (36.60) Note: (1) Revisions to consolidated financial results forecasts made during the quarter under review: Yes (2) SUMCO discloses forecasts for the forthcoming quarter only. Please see “(2) Explanation of Financial Results Forecasts” on page 2 of Supplementary Materials.
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* Notes (1) Significant changes in the scope of consolidation during the period: None Newly included: － Excluded: － (2) Adoption of accounting treatment specific to the prepar ation of semi-annual consolidated financial statements: None (3) Changes in accounting policies, change s in accounting estimates, and restatement (i) Changes in accounting policies due to revisions to accounting standards and other regulations: None (ii) Changes in accounting policies due to other reasons: None (iii) Changes in accounting estimates: None (iv) Restatement: None (4) Number of issued shares (common shares) (i) Total number of issued shares at the end of the period (including treasury shares) As of Jun. 30, 2026 350,175,139 shares As of Dec. 31, 2025 350,175,139 shares (ii) Number of treasury shares at the end of the period As of Jun. 30, 2026 442,825 shares As of Dec. 31, 2025 462,718 shares (iii) Average number of shares outstanding during th e period (cumulative from the beginning of the fiscal year) Six months ended Jun. 30, 2026 349,718,600 shares Six months ended Jun. 30, 2025 349,709,341 shares * Semi-annual financial results reports are exempt from review conducted by certified public accountants or an audit firm. * Proper use of earnings forecasts, and other special matters Financial results forecasts and other forward-looking statements contained in this Consolidated Financial Results are based on information currently available to the Company and on certain assumptions that the Company considers to be reasonable, and do not constitute guarantees of future performance. Actual results may differ significantly from those projected in the forward-looking statements as a result of various factors. Regarding the assumptions underlying financial results forecasts, please see “(2) Explanation of Financial Results Forecasts” on page 2 of Supplementary Materials. Year-end dividend per share for the fiscal year ending Dec. 31, 2026 is not determined, and a forecast will be disclosed as soon as the disclosure becomes possible. A financial results briefing for institutional investors and security analysts is scheduled on August 6, 2026. Presentation materials for quarterly financial results are available on our website before starting the briefing.
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(Supplementary Materials) Contents 1. Qualitative Information for the Second Quarter of Fiscal Year 2026 ..................................................... 2 (1) Explanation of Business Results .............................................................................................. ......... 2 (2) Explanation of Financial Results Forecasts ................................................................................... ... 2 2. Consolidated Financial Statements and Notes ........................................................................................ 4 (1) Consolidated Balance Sheet ................................................................................................... ........... 4 (2) Consolidated Statement of Income and Consolidated Statement of Comprehensive Income .......... 6 (3) Notes to Consolidated Financial Statements ....................................................................................... 8 (Notes to Going Concern Assumption) .......................................................................................... . 8 (Notes to Significant Changes in Shareholders’ Equity) ................................................................. 8 SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 1
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1. Qualitative Information for the Second Quarter of Fiscal Year 2026 (1) Explanation of Business Results During the second quarter of fiscal year 2026 (April 1, 2026–June 30, 2026), the semiconductor market grew on a volume basis, driven by AI-related demand and including prod ucts for industrial use, for which recovery had lagged. Strong growth was seen also on a monetary value basis, helped by rising memory prices. Shipments of 300 mm silicon wafers saw a large increase, as strong demand continued for leading-edge logic and memory used in AI data centers. Shipments of wafers of 200 mm and smaller increased as well, even though demand varied across customers and products. In this environment, the SUMCO Group focused on maintaining its high market share of leading-edge products, carrying on with technology development aimed at meeting customer needs for higher precision and producing distinctive products. We further made efforts to boost our cost competitiveness, including by raising productivity with the use of AI. We have been restructuring our production of 200 mm and smaller wafers, continuing our efforts to enhance efficiency and profitability. As a result, for the period under review, the Group registered consolidated net sales of 215,016 million yen, operating loss of 6,363 million yen, ordinary loss of 12,179 million yen, and loss attributable to owners of parent of 12,895 million yen. (2) Explanation of Financial Results Forecasts In the third quarter of fiscal year 2026 (July 1, 2026–September 30, 2026), 300 mm wafers are expected to see strong demand for leading-edge lo gic and DRAM for AI applications, while demand for NAND use is also projected to grow in line with the expansion of server SSDs. The supply-demand situation for 300 mm wafers overall is expected to continue improving as inventor y drawdown by customers proceeds. As for wafers of 200 mm and smaller, despite demand variance among customers and products, gradual recovery is seen. The Group will further enhance its response capability by upgrading its manufacturing facilities for 300 mm products, in light of continued strong demand growth for leading-edge products. As for 200 mm and smaller wafers, we will strive to improve efficiency and profitability through initiatives such as reorganizing our production systems. Risks from the situation in the Middle East have not affected our operations at this time, but there are concerns about the impact on procurement costs including for electric power and materials. We will continue closely watching the impacts on the market environment from geopolitical risks and the policies of individual countries, paying special attention to the impact on demand for end products containing semiconductors. Since the semiconductor industry to which the Group belongs is characterized by drastic and short-term changes in the business environment, the Group has adopted the policy of disclosing financial results forecasts for the forthcoming quarter only. SUMCO announces its consolidated financial results for ecasts for the nine months ending Sep. 30, 2026 as follows. Consolidated Financial Results Forecasts for the nine months ending Sep. 30, 2026 (from Jan. 1, 2026 to Sep. 30, 2026) Net sales Operating profit Ordinary profit Profit attributable to owners of parent Basic earnings per share (millions of yen) (millions of yen) (millions of yen) (millions of yen) (yen) Previous Forecasts (A) － － － － － Revised Forecasts (B) 333,000 (6,300) (11,100) (12,800) (36.60) Changes (B-A) － － － － Rate of changes (%) － － － － (Reference) Results for nine months ended Sep. 30, 2025 304,436 5,869 2,175 (995) (2.85) SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 2
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(Notes) (1) Financial results forecasts and other forward-looking statements contained in this Consolidated Financial Results are based on information currently available to the Company and on certain assumptions that the Company considers to be reasonable, and do not constitute guarantees of future performance. Actual results may differ si gnificantly from those projected in the forward- looking statements as a result of various factors. (2) The above forecasts are made ba sed on an assumed exchange rate for the three months ending Sep. 30, 2026 (from Jul. 1, 2026 to Sep. 30, 2026) of one U.S. dollar to 160 yen. SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 3
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2. Consolidated Financial Statements and Notes (1) Consolidated Balance Sheet (Millions of yen) As of December 31, 2025 As of June 30, 2026 Assets Current assets Cash and deposits 67,296 89,766 Notes and accounts receivable - trade, and contract assets 89,994 94,565 Securities 8,000 22,000 Merchandise and finished goods 26,166 26,493 Work in process 32,011 32,838 Raw materials and supplies 192,466 200,553 Other 11,436 10,817 Allowance for doubtful accounts (12) (12) Total current assets 427,359 477,022 Non-current assets Property, plant and equipment Buildings and structures, net 198,044 194,769 Machinery, equipment and vehicles, net 310,240 326,342 Land 22,881 22,989 Construction in progress 123,432 70,773 Other, net 8,826 8,869 Total property, plant and equipment 663,425 623,743 Intangible assets Other 7,231 6,894 Total intangible assets 7,231 6,894 Investments and other assets Investment securities 2,912 2,811 Long-term advance payments 17,919 16,123 Deferred tax assets 5,392 6,227 Other 4,023 4,165 Allowance for doubtful accounts (297) (304) Total investments and other assets 29,950 29,024 Total non-current assets 700,607 659,662 Total assets 1,127,966 1,136,685 SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 4
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(Millions of yen) As of December 31, 2025 As of June 30, 2026 Liabilities Current liabilities Notes and accounts payable - trade 32,126 38,771 Short-term borrowings 41,253 46,304 Lease liabilities 105 86 Income taxes payable 3,417 4,312 Provision for bonuses 2,225 1,571 Other 53,952 50,456 Total current liabilities 133,080 141,502 Non-current liabilities Long-term borrowings 312,200 320,836 Lease liabilities 150 113 Provision for share-based payments 123 82 Retirement benefit liability 20,217 19,884 Other 14,409 13,199 Total non-current liabilities 347,100 354,115 Total liabilities 480,181 495,618 Net assets Shareholders' equity Share capital 199,034 199,034 Capital surplus 86,161 88,471 Retained earnings 260,458 244,060 Treasury shares (914) (875) Total shareholders' equity 544,739 530,691 Accumulated other comprehensive income Valuation difference on available-for-sale securities 0 0 Deferred gains or losses on hedges (942) - Revaluation reserve for land 2,846 2,846 Foreign currency translation adjustment 29,286 32,248 Remeasurements of defined benefit plans 2,448 2,370 Total accumulated other comprehensive income 33,639 37,465 Non-controlling interests 69,406 72,910 Total net assets 647,785 641,067 Total liabilities and net assets 1,127,966 1,136,685 SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 5
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(2) Consolidated Statement of Income and Cons olidated Statement of Comprehensive Income (Consolidated Statement of Income) (Millions of yen) For the six months ended June 30, 2025 For the six months ended June 30, 2026 Net sales 205,372 215,016 Cost of sales 168,070 193,083 Gross profit 37,301 21,933 Selling, general and administrative expenses 29,844 28,297 Operating profit (loss) 7,457 (6,363) Non-operating income Interest income 890 756 Dividend income 0 0 Other 2,413 467 Total non-operating income 3,304 1,224 Non-operating expenses Interest expenses 1,349 1,844 Depreciation 698 4,116 Other 3,993 1,078 Total non-operating expenses 6,041 7,039 Ordinary profit (loss) 4,720 (12,179) Profit (loss) before income taxes 4,720 (12,179) Income taxes 1,398 769 Profit (loss) 3,322 (12,949) Profit (loss) attributable to non-controlling interests 240 (53) Profit (loss) attributable to owners of parent 3,081 (12,895) SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 6
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(Consolidated Statement of Comprehensive Income) (Millions of yen) For the six months ended June 30, 2025 For the six months ended June 30, 2026 Profit (loss) 3,322 (12,949) Other comprehensive income Valuation difference on available-for-sale securities 0 0 Deferred gains or losses on hedges 1,170 942 Revaluation reserve for land (39) - Foreign currency translation adjustment (2,469) 5,292 Remeasurements of defined benefit plans, net of tax 75 (71) Total other comprehensive income (1,262) 6,163 Comprehensive income 2,059 (6,786) Comprehensive income attributable to Comprehensive income attributable to owners of parent (443) (8,323) Comprehensive income attributable to non-controlling interests 2,503 1,537 SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 7
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(3) Notes to Consolidated Financial Statements (Notes to Going Concern Assumption) Not applicable (Notes to Significant Changes in Shareholders’ Equity) I January 1, 2025–June 30, 2025 As resolved at the May 11, 2023 Board of Director s Meeting, the Company introduced a performance-based stock compensation plan. As a result of delivering 4,400 shares of the Company’s stock held in the trust to those eligible under this plan, treasury stock declined by 8 million yen, amounting to 914 million yen as of the end of the semi-annual period of fiscal year 2025. II January 1, 2026–June 30, 2026 As resolved at the May 11, 2023 Board of Director s Meeting, the Company introduced a performance-based stock compensation plan. As a result of delivering 19,900 shares of the Company’s stock held in the trust to those eligible under this plan, treasury stock declined by 39 million yen, amounting to 875 million yen as of the end of the semi-annual period of fiscal year 2026. SUMCO Corporation: Consolidated Financial Results for the Second Quarter of FY2026 8