Slides
Page 1
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Results for Fiscal Year 2025 (Ended December 31, 2025) February 10, 2026 SUMCO Corporation （Code：3436） （LEI：353800SUSRUOM0V6KU92） 1 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Notes Regarding the Forecasts This material is prepared for the purpose of continuous disclosure to general shareholders and investors and will not constitute an offer or solicitation of securities of the Company in any states or jurisdictions. The estimate, expectation, forecast and other future information is prepared based on the information which is available for the Company as of today and on certain assumptions and qualifications (which includes our subjective judgment) and the actual financial performance or result may be substantially different from such future information contained in the material due to risk factors including domestic and global economic conditions, trend of semiconductor market and foreign exchanges. 2
Page 2
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Results for Fiscal Year 2025 (Ended December 31, 2025) February 10, 2026 SUMCO Corporation （Code：3436） （LEI：353800SUSRUOM0V6KU92） 1 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Notes Regarding the Forecasts This material is prepared for the purpose of continuous disclosure to general shareholders and investors and will not constitute an offer or solicitation of securities of the Company in any states or jurisdictions. The estimate, expectation, forecast and other future information is prepared based on the information which is available for the Company as of today and on certain assumptions and qualifications (which includes our subjective judgment) and the actual financial performance or result may be substantially different from such future information contained in the material due to risk factors including domestic and global economic conditions, trend of semiconductor market and foreign exchanges. 2
Page 3
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Contents ■ Summary and Market Environment ■ FY2025 Consolidated Business Result Summary of Consolidated Business Result Analysis of Changes in Operating Profit Consolidated Balance Sheet and Consolidated Cash-Flow ■ 1Q-2026 Consolidated Business Forecast Consolidated Business Forecast Analysis of Changes in Operating Profit ■ Reference Materials 3 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Summary and Market Environment Mayuki Hashimoto Representative Director, CEO & Chairman of the Board 4
Page 4
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Contents ■ Summary and Market Environment ■ FY2025 Consolidated Business Result Summary of Consolidated Business Result Analysis of Changes in Operating Profit Consolidated Balance Sheet and Consolidated Cash-Flow ■ 1Q-2026 Consolidated Business Forecast Consolidated Business Forecast Analysis of Changes in Operating Profit ■ Reference Materials 3 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Summary and Market Environment Mayuki Hashimoto Representative Director, CEO & Chairman of the Board 4
Page 5
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1-1. Summary ■ 4Q-2025 Consolidated Business Result ■ 1Q-2026 Consolidated Business Forecast (Note) Profit attributable to owners of parent 5 (Billions of Yen) 4Q-2025 4Q-2025 FY2025 Forecast Actual Actual Net Sales 100.0 105.2 +5.2 409.6 Operating Profit (10.0) (4.5) +5.5 1.3 Ordinary Profit (13.0) (5.9) +7.1 (3.8) Profit (Note) (16.0) (10.8) +5.2 (11.7) EBITDA margin (%) 24.6% 27.5% +2.9% 27.4% Exchange Rate (Yen/US$) 148.0 153.1 +5.1 149.8 Change (Billions of Yen) 4Q-2025 1Q-2026 Actual Forecast Net Sales 105.2 100.0 (5.2) Operating Profit (4.5) (6.0) (1.5) Ordinary Profit (5.9) (10.0) (4.1) Profit (Note) (10.8) (10.0) +0.8 EBITDA margin (%) 27.5% 23.2% (4.3%) Exchange Rate (Yen/US$) 153.1 155.0 +1.9 Change 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1-2. Shareholder Return (Forecast) 6 Dividends are decided based on an overall consideration of profit levels, future outlook, funding needs for capital investment and other purposes, free cash flow, EBITDA, the status of dividend resources, and other factors. FY2021 (Dec-2021) FY2022 (Dec-2022) FY2023 (Dec-2023) FY2024 (Dec-2024) FY2025 (Dec-2025) Interim 17 36 42 15 10 Year-end 24 45 13 6 10 Total 41 81 55 21 20 Interim 4.9 12.6 14.7 5.2 3.5 Year-end 8.4 15.7 4.5 2.1 3.5 Total 13.3 28.3 19.2 7.3 7.0 Dividends per share for common stocks (Yen) Dividends payment (Billions of Yen)
Page 6
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1-1. Summary ■ 4Q-2025 Consolidated Business Result ■ 1Q-2026 Consolidated Business Forecast (Note) Profit attributable to owners of parent 5 (Billions of Yen) 4Q-2025 4Q-2025 FY2025 Forecast Actual Actual Net Sales 100.0 105.2 +5.2 409.6 Operating Profit (10.0) (4.5) +5.5 1.3 Ordinary Profit (13.0) (5.9) +7.1 (3.8) Profit (Note) (16.0) (10.8) +5.2 (11.7) EBITDA margin (%) 24.6% 27.5% +2.9% 27.4% Exchange Rate (Yen/US$) 148.0 153.1 +5.1 149.8 Change (Billions of Yen) 4Q-2025 1Q-2026 Actual Forecast Net Sales 105.2 100.0 (5.2) Operating Profit (4.5) (6.0) (1.5) Ordinary Profit (5.9) (10.0) (4.1) Profit (Note) (10.8) (10.0) +0.8 EBITDA margin (%) 27.5% 23.2% (4.3%) Exchange Rate (Yen/US$) 153.1 155.0 +1.9 Change 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1-2. Shareholder Return (Forecast) 6 Dividends are decided based on an overall consideration of profit levels, future outlook, funding needs for capital investment and other purposes, free cash flow, EBITDA, the status of dividend resources, and other factors. FY2021 (Dec-2021) FY2022 (Dec-2022) FY2023 (Dec-2023) FY2024 (Dec-2024) FY2025 (Dec-2025) Interim 17 36 42 15 10 Year-end 24 45 13 6 10 Total 41 81 55 21 20 Interim 4.9 12.6 14.7 5.2 3.5 Year-end 8.4 15.7 4.5 2.1 3.5 Total 13.3 28.3 19.2 7.3 7.0 Dividends per share for common stocks (Yen) Dividends payment (Billions of Yen)
Page 7
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-1. 200 mm Wafer Trend （Source： SUMCO’s estimation) 7 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-2. 300 mm Wafer Trend （Source： SUMCO’s estimation) 8
Page 8
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-1. 200 mm Wafer Trend （Source： SUMCO’s estimation) 7 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-2. 300 mm Wafer Trend （Source： SUMCO’s estimation) 8
Page 9
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-3. Market Environment ■ 4Q-2025 Volume - The recovery trend for 300 mm wafers continued throughout the year. - Shipments remained slow for 200 mm wafers. Pricing - Long-term contract prices were honored for both 300mm and 200mm wafers. ■ 1Q-2026 Forecast Volume - 300 mm wafer outlook remains favorable for leading-edge products, driven by AI. Even as demand recovery lags for legacy products, moves by customers to speed up their inventory drawdown are seen. - Demand growth related to AI data centers is seen for 200 mm wafers. Pricing - Long-term contract prices are being maintained for both 300mm and 200mm wafers. ■ Outlook The semiconductor market will see continued strong growth for AI use, and gradual recovery for other than AI. The silicon wafer market is expected to see strong demand for 300 mm products for leading-edge logic and DRAM in AI data centers, with an uptick in demand for NAND projected ahead. As for legacy products, we anticipate that customers will plan to conduct full-scale inventory drawdown and adjust their purchase volumes accordingly. Regarding wafers of 200 mm and smaller, while some demand growth is seen in the AI data center field, the current demand scale is expected to continue due to the shift to 300 mm and geopolitical impacts. 9 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 800 650 0 200 400 600 800 1,000 Jan. Jul. Jan. Jul. Oct. 2024 2025 ChatGPT Gemini (million) Users of generative AI are rapidly increasing. With 800 million users of ChatGPT and 650 million Gemini users, there are growing moves to provide environments for actual use rather than simply for training. AI server demand is expanding beyond training to include inference application. 3-1. Expanding AI User Base and the Shift to Inference Active users of generative AI (example) (Source: Created by SUMCO based on publicly available information) 10
Page 10
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 2-3. Market Environment ■ 4Q-2025 Volume - The recovery trend for 300 mm wafers continued throughout the year. - Shipments remained slow for 200 mm wafers. Pricing - Long-term contract prices were honored for both 300mm and 200mm wafers. ■ 1Q-2026 Forecast Volume - 300 mm wafer outlook remains favorable for leading-edge products, driven by AI. Even as demand recovery lags for legacy products, moves by customers to speed up their inventory drawdown are seen. - Demand growth related to AI data centers is seen for 200 mm wafers. Pricing - Long-term contract prices are being maintained for both 300mm and 200mm wafers. ■ Outlook The semiconductor market will see continued strong growth for AI use, and gradual recovery for other than AI. The silicon wafer market is expected to see strong demand for 300 mm products for leading-edge logic and DRAM in AI data centers, with an uptick in demand for NAND projected ahead. As for legacy products, we anticipate that customers will plan to conduct full-scale inventory drawdown and adjust their purchase volumes accordingly. Regarding wafers of 200 mm and smaller, while some demand growth is seen in the AI data center field, the current demand scale is expected to continue due to the shift to 300 mm and geopolitical impacts. 9 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 800 650 0 200 400 600 800 1,000 Jan. Jul. Jan. Jul. Oct. 2024 2025 ChatGPT Gemini (million) Users of generative AI are rapidly increasing. With 800 million users of ChatGPT and 650 million Gemini users, there are growing moves to provide environments for actual use rather than simply for training. AI server demand is expanding beyond training to include inference application. 3-1. Expanding AI User Base and the Shift to Inference Active users of generative AI (example) (Source: Created by SUMCO based on publicly available information) 10
Page 11
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 1 2 3 4 5 6 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( million units ) 3-2．AI Server Demand Forecasts by Application Growth in servers for inference use is expected as AI users increase. ( Source: SUMCO estimates based on data from multiple research companies ) 11 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Training Inference Acquiring rules and patterns Training on large amounts of data （Massive repetitive computations) (fast, large-capacity DRAM/HBM) Earn high accuracy and versatility Mainly by GPU Calculating answers and predictions High volume of requests (Logs kept for each request) (fast, large-capacity NAND) Instant decision making and response By Specialized ASIC Speech/image recognition Text/image generation Program code generation QA, summarization, translation Quality anomaly detection Security 3-3. Training and Inference Functions and Makeup 12
Page 12
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 1 2 3 4 5 6 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( million units ) 3-2．AI Server Demand Forecasts by Application Growth in servers for inference use is expected as AI users increase. ( Source: SUMCO estimates based on data from multiple research companies ) 11 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Training Inference Acquiring rules and patterns Training on large amounts of data （Massive repetitive computations) (fast, large-capacity DRAM/HBM) Earn high accuracy and versatility Mainly by GPU Calculating answers and predictions High volume of requests (Logs kept for each request) (fast, large-capacity NAND) Instant decision making and response By Specialized ASIC Speech/image recognition Text/image generation Program code generation QA, summarization, translation Quality anomaly detection Security 3-3. Training and Inference Functions and Makeup 12
Page 13
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 400 800 1,200 1,600 2024 2025 2026 2027 2028 2029 Training Inference AI TTL (k wafers / month ) 0 5 10 15 20 25 2024 2025 2026 2027 2028 2029 Training Inference (TB/unit） 3-4. Wafer Demand Forecast for Leading-Edge DRAM in AI Servers DRAM capacity per server Wafer demand for DRAM used in AI DRAM capacity per server is growing, with large amounts needed especially for training. Demand growth for wafers will be driven by significant unit growth in inference application. (Source: SUMCO calculates based on data from various research companies) 13 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 100 200 300 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( k wafers/ month ) NAND capacity per server 3-5. Wafer Demand Forecast for Leading-Edge NAND in AI Servers Wafer demand for NAND used in AI Demand for NAND in inference servers will continue growing to meet speed and capacity needs. Wafer demand is forecast to increase for inference use, helped also by growth in number of servers. (Source: SUMCO calculates based on data from various research companies) 14 0 20 40 60 80 100 2024 2025 2026 2027 2028 2029 Training Inference (TB/unit)
Page 14
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 400 800 1,200 1,600 2024 2025 2026 2027 2028 2029 Training Inference AI TTL (k wafers / month ) 0 5 10 15 20 25 2024 2025 2026 2027 2028 2029 Training Inference (TB/unit） 3-4. Wafer Demand Forecast for Leading-Edge DRAM in AI Servers DRAM capacity per server Wafer demand for DRAM used in AI DRAM capacity per server is growing, with large amounts needed especially for training. Demand growth for wafers will be driven by significant unit growth in inference application. (Source: SUMCO calculates based on data from various research companies) 13 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 100 200 300 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( k wafers/ month ) NAND capacity per server 3-5. Wafer Demand Forecast for Leading-Edge NAND in AI Servers Wafer demand for NAND used in AI Demand for NAND in inference servers will continue growing to meet speed and capacity needs. Wafer demand is forecast to increase for inference use, helped also by growth in number of servers. (Source: SUMCO calculates based on data from various research companies) 14 0 20 40 60 80 100 2024 2025 2026 2027 2028 2029 Training Inference (TB/unit)
Page 15
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 500 1,000 1,500 2,000 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( k wafers / month ) 3-6. Leading-Edge Wafer Demand Forecast by AI Server Application (GPU/ASIC、DRAM（HBM）、NAND on total advanced products) As AI expands, demand will be driven by inference use in addition to training. Demand for leading-edge wafers for fast and large-scale processing chips will be expanding. Demand forecast for leading-edge silicon wafers for AI semiconductors (Source: SUMCO calculates based on data from various research companies) 15 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 4-1. Customers’ 300 mm Wafer Inventory Trend （Source： SUMCO’s estimation) 16
Page 16
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 0 500 1,000 1,500 2,000 2024 2025 2026 2027 2028 2029 Training Inference AI TTL ( k wafers / month ) 3-6. Leading-Edge Wafer Demand Forecast by AI Server Application (GPU/ASIC、DRAM（HBM）、NAND on total advanced products) As AI expands, demand will be driven by inference use in addition to training. Demand for leading-edge wafers for fast and large-scale processing chips will be expanding. Demand forecast for leading-edge silicon wafers for AI semiconductors (Source: SUMCO calculates based on data from various research companies) 15 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 4-1. Customers’ 300 mm Wafer Inventory Trend （Source： SUMCO’s estimation) 16
Page 17
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 4-2. Customers’ 300 mm Wafer Inventory (Logic/Memory) （Source： SUMCO’s estimation) 17 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION FY2025 Consolidated Business Result Shinichi Kubozoe Representative Director, Executive Vice President, Chief Financial Officer 18
Page 18
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 4-2. Customers’ 300 mm Wafer Inventory (Logic/Memory) （Source： SUMCO’s estimation) 17 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION FY2025 Consolidated Business Result Shinichi Kubozoe Representative Director, Executive Vice President, Chief Financial Officer 18
Page 19
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 5-1. Summary of Consolidated Business Result 19 (Billions of Yen) FY2024 Actual 1Q 2Q 3Q 4Q Total Net sales 396.6 102.4 102.9 99.1 105.2 409.6 +13.0 Operating profit 36.9 5.9 1.5 (1.6) (4.5) 1.3 (35.6) Non-operating income and expenses 0.5 (1.1) (1.6) (1.0) (1.4) (5.1) (5.6) Ordinary profit 37.4 4.8 (0.1) (2.6) (5.9) (3.8) (41.2) Extraordinary income and losses (5.8) - - - - - +5.8 Income taxes (8.3) (1.2) (0.2) (0.9) (3.8) (6.1) +2.2 Profit attributable to non-controlling interests (3.5) (0.6) 0.3 (0.4) (1.1) (1.8) +1.7 Profit attributable to owners of parent 19.8 3.0 0.0 (3.9) (10.8) (11.7) (31.5) Capital expenditure (Acceptance basis) 214.9 32.7 19.2 17.4 10.6 79.9 (135.0) Depreciation 78.9 22.7 26.7 30.6 35.6 115.6 +36.7 Operating depriciation 77.1 22.6 26.1 28.9 33.4 111.0 +33.9 EBITDA 114.0 28.6 27.5 27.3 29.0 112.4 (1.6) Exchange rate (Yen/US$) 151.1 153.9 145.2 147.1 153.1 149.8 (1.3) Operating margin (%) 9.3% 5.8% 1.4% (1.6%) (4.3%) 0.3% (9.0%) EBITDA margin (%) 28.8% 28.0% 26.7% 27.6% 27.5% 27.4% (1.3%) ROE (%) 3.4% 1.8% (0.4%) (2.8%) (7.4%) (2.0%) (5.5%) Basic Earnings per share (Yen) 56.84 8.71 0.10 (11.66) (30.76) (33.60) (90.45) *2. If the yen appreciates by 1 yen against the US dollar, operating profit of SUMCO will decrease by 1.2 billion yen per year *1. EBITDA = Operating profit + Operating Depreciation + Amortization of Goodwill ChangeFY2025 Actual (*1) (*2) (*1) (*2) 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) FY2024 FY2025 Actual Actual Net Sales 396.6 409.6 +13.0 Operating Profit 36.9 1.3 (35.6) Exchange Rate (Yen/US$) 151.1 149.8 (1.3) Change (Billions of Yen) 3Q-2025 4Q-2025 Actual Actual Net Sales 99.1 105.2 +6.1 Operating Profit (1.6) (4.5) (2.9) Exchange Rate (Yen/US$) 147.1 153.1 +6.1 Change 5-2. Analysis of Changes in Operating Profit 1. 3Q-2025 Actual → 4Q-2025 Actual 2. FY2024 Actual → FY2025 Actual ¥2.9 billion Decrease ¥35.6 billion Decrease 20
Page 20
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 5-1. Summary of Consolidated Business Result 19 (Billions of Yen) FY2024 Actual 1Q 2Q 3Q 4Q Total Net sales 396.6 102.4 102.9 99.1 105.2 409.6 +13.0 Operating profit 36.9 5.9 1.5 (1.6) (4.5) 1.3 (35.6) Non-operating income and expenses 0.5 (1.1) (1.6) (1.0) (1.4) (5.1) (5.6) Ordinary profit 37.4 4.8 (0.1) (2.6) (5.9) (3.8) (41.2) Extraordinary income and losses (5.8) - - - - - +5.8 Income taxes (8.3) (1.2) (0.2) (0.9) (3.8) (6.1) +2.2 Profit attributable to non-controlling interests (3.5) (0.6) 0.3 (0.4) (1.1) (1.8) +1.7 Profit attributable to owners of parent 19.8 3.0 0.0 (3.9) (10.8) (11.7) (31.5) Capital expenditure (Acceptance basis) 214.9 32.7 19.2 17.4 10.6 79.9 (135.0) Depreciation 78.9 22.7 26.7 30.6 35.6 115.6 +36.7 Operating depriciation 77.1 22.6 26.1 28.9 33.4 111.0 +33.9 EBITDA 114.0 28.6 27.5 27.3 29.0 112.4 (1.6) Exchange rate (Yen/US$) 151.1 153.9 145.2 147.1 153.1 149.8 (1.3) Operating margin (%) 9.3% 5.8% 1.4% (1.6%) (4.3%) 0.3% (9.0%) EBITDA margin (%) 28.8% 28.0% 26.7% 27.6% 27.5% 27.4% (1.3%) ROE (%) 3.4% 1.8% (0.4%) (2.8%) (7.4%) (2.0%) (5.5%) Basic Earnings per share (Yen) 56.84 8.71 0.10 (11.66) (30.76) (33.60) (90.45) *2. If the yen appreciates by 1 yen against the US dollar, operating profit of SUMCO will decrease by 1.2 billion yen per year *1. EBITDA = Operating profit + Operating Depreciation + Amortization of Goodwill ChangeFY2025 Actual (*1) (*2) (*1) (*2) 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) FY2024 FY2025 Actual Actual Net Sales 396.6 409.6 +13.0 Operating Profit 36.9 1.3 (35.6) Exchange Rate (Yen/US$) 151.1 149.8 (1.3) Change (Billions of Yen) 3Q-2025 4Q-2025 Actual Actual Net Sales 99.1 105.2 +6.1 Operating Profit (1.6) (4.5) (2.9) Exchange Rate (Yen/US$) 147.1 153.1 +6.1 Change 5-2. Analysis of Changes in Operating Profit 1. 3Q-2025 Actual → 4Q-2025 Actual 2. FY2024 Actual → FY2025 Actual ¥2.9 billion Decrease ¥35.6 billion Decrease 20
Page 21
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) FY2025 (12months) Profit before income taxes (3.8) Depreciation 115.6 Subtotal 111.8 Decrease (increase) in inventories (12.5) Others, net 0.7 Net cash provided by operating activities 100.0 Capital expenditure (Acceptance basis) (79.9) Others, net (31.5) Net cash used in investing activities (111.4) Free cash-flow (11.4) Dividends paid (7.5) Net proceeds from (repayments of) borrowings (3.8) Others, net 2.3 Net increase (decrease) in cash and cash equivalents (20.4) Cash flow from financing activities, etc. (Billions of Yen) Cash and deposits 95.6 75.2 (20.4) Notes and accounts receivable 92.5 89.9 (2.6) Finished goods and WIP 54.7 58.1 +3.4 Raw materials and supplies 178.5 192.4 +13.9 Tangible and intangible assets 699.6 670.6 (29.0) Deferred tax assets 9.3 5.3 (4.0) Other assets 42.4 36.4 (6.0) Total Assets 1,172.6 1,127.9 (44.7) Interest-bearing debt 353.9 353.7 (0.2) Other liabilities 161.5 126.5 (35.0) Total Liabilities 515.4 480.2 (35.2) Share capital 199.0 199.0 - Capital surplus 85.5 86.1 +0.6 Retained earnings 277.8 260.4 (17.4) Non-controlling interests etc. 94.9 102.2 +7.3 Total Net Assets 657.2 647.7 (9.5) Equity-to-asset ratio (%) 50.5% 51.3% +0.8% Net assets per share (Yen) 1,693.2 1,653.9 (39.3) D/E ratio (gross) 0.60x 0.61x +0.01x D/E ratio (net) 0.44x 0.48x +0.05x ChangeEnd of Dec-2024 End of Dec-2025 5-3. Balance Sheet and Cash-Flow (Consolidated) 1. Consolidated Balance Sheet 2. Consolidated Cash-Flow 21 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1Q-2026 Consolidated Business Forecast 22
Page 22
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) FY2025 (12months) Profit before income taxes (3.8) Depreciation 115.6 Subtotal 111.8 Decrease (increase) in inventories (12.5) Others, net 0.7 Net cash provided by operating activities 100.0 Capital expenditure (Acceptance basis) (79.9) Others, net (31.5) Net cash used in investing activities (111.4) Free cash-flow (11.4) Dividends paid (7.5) Net proceeds from (repayments of) borrowings (3.8) Others, net 2.3 Net increase (decrease) in cash and cash equivalents (20.4) Cash flow from financing activities, etc. (Billions of Yen) Cash and deposits 95.6 75.2 (20.4) Notes and accounts receivable 92.5 89.9 (2.6) Finished goods and WIP 54.7 58.1 +3.4 Raw materials and supplies 178.5 192.4 +13.9 Tangible and intangible assets 699.6 670.6 (29.0) Deferred tax assets 9.3 5.3 (4.0) Other assets 42.4 36.4 (6.0) Total Assets 1,172.6 1,127.9 (44.7) Interest-bearing debt 353.9 353.7 (0.2) Other liabilities 161.5 126.5 (35.0) Total Liabilities 515.4 480.2 (35.2) Share capital 199.0 199.0 - Capital surplus 85.5 86.1 +0.6 Retained earnings 277.8 260.4 (17.4) Non-controlling interests etc. 94.9 102.2 +7.3 Total Net Assets 657.2 647.7 (9.5) Equity-to-asset ratio (%) 50.5% 51.3% +0.8% Net assets per share (Yen) 1,693.2 1,653.9 (39.3) D/E ratio (gross) 0.60x 0.61x +0.01x D/E ratio (net) 0.44x 0.48x +0.05x ChangeEnd of Dec-2024 End of Dec-2025 5-3. Balance Sheet and Cash-Flow (Consolidated) 1. Consolidated Balance Sheet 2. Consolidated Cash-Flow 21 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 1Q-2026 Consolidated Business Forecast 22
Page 23
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 6-1. 1Q-2026 Consolidated Business Forecast 23 (Billions of Yen) Net sales 102.4 105.2 100.0 (2.4) (5.2) Operating profit 5.9 (4.5) (6.0) (11.9) (1.5) Non-operating income and expenses (1.1) (1.4) (4.0) (2.9) (2.6) Ordinary profit 4.8 (5.9) (10.0) (14.8) (4.1) Income taxes (1.2) (3.8) (0.4) +0.8 +3.4 Profit attributable to non-controlling interests (0.6) (1.1) 0.4 +1.0 +1.5 Profit attributable to owners of parent 3.0 (10.8) (10.0) (13.0) +0.8 Depreciation 22.7 35.6 31.3 +8.6 (4.3) Operating depriciation 22.6 33.4 29.2 +6.6 (4.2) EBITDA 28.6 29.0 23.2 (5.4) (5.8) Exchange rate (Yen/US$) 153.9 153.1 155.0 +1.1 +1.9 Operatin g margin (%) 5.8% (4.3%) (6.0%) (11.8%) (1.7%) EBITDA margin (%) 28.0% 27.5% 23.2% (4.8%) (4.3%) ROE (%) 1.8% (7.4%) (7.0%) (8.8%) +0.4% Basic Earnings per share (Yen) 8.71 (30.76) (28.59) (37.30) +2.17 *1 . If the yen appreciates by 1 yen against the US dollar, operating profit of SUMCO will decrease by 1.1 billion yen per year. 1Q-2025 Actual Change YoY 1Q-2026 Forecast 4Q-2025 Actual Change QoQ (*1) (*1) 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) 1Q-2025 1Q-2026 Actual Forecast Net Sales 102.4 100.0 (2.4) Operating Profit 5.9 (6.0) (11.9) Exchange Rate (Yen/US$) 153.9 155.0 +1.1 Change 6-2. Analysis of Changes in Operating Profit 1. 4Q-2025 Actual → 1Q-2026 Forecast ¥1.5 billion Decrease ¥11.9 billion Decrease 24 (Billions of Yen) 4Q-2025 1Q-2026 Actual Forecast Net Sales 105.2 100.0 (5.2) Operating Profit (4.5) (6.0) (1.5) Exchange Rate (Yen/US$) 153.1 155.0 +1.9 Change 2. 1Q-2025 Actual → 1Q-2026 Forecast
Page 24
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION 6-1. 1Q-2026 Consolidated Business Forecast 23 (Billions of Yen) Net sales 102.4 105.2 100.0 (2.4) (5.2) Operating profit 5.9 (4.5) (6.0) (11.9) (1.5) Non-operating income and expenses (1.1) (1.4) (4.0) (2.9) (2.6) Ordinary profit 4.8 (5.9) (10.0) (14.8) (4.1) Income taxes (1.2) (3.8) (0.4) +0.8 +3.4 Profit attributable to non-controlling interests (0.6) (1.1) 0.4 +1.0 +1.5 Profit attributable to owners of parent 3.0 (10.8) (10.0) (13.0) +0.8 Depreciation 22.7 35.6 31.3 +8.6 (4.3) Operating depriciation 22.6 33.4 29.2 +6.6 (4.2) EBITDA 28.6 29.0 23.2 (5.4) (5.8) Exchange rate (Yen/US$) 153.9 153.1 155.0 +1.1 +1.9 Operatin g margin (%) 5.8% (4.3%) (6.0%) (11.8%) (1.7%) EBITDA margin (%) 28.0% 27.5% 23.2% (4.8%) (4.3%) ROE (%) 1.8% (7.4%) (7.0%) (8.8%) +0.4% Basic Earnings per share (Yen) 8.71 (30.76) (28.59) (37.30) +2.17 *1 . If the yen appreciates by 1 yen against the US dollar, operating profit of SUMCO will decrease by 1.1 billion yen per year. 1Q-2025 Actual Change YoY 1Q-2026 Forecast 4Q-2025 Actual Change QoQ (*1) (*1) 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION (Billions of Yen) 1Q-2025 1Q-2026 Actual Forecast Net Sales 102.4 100.0 (2.4) Operating Profit 5.9 (6.0) (11.9) Exchange Rate (Yen/US$) 153.9 155.0 +1.1 Change 6-2. Analysis of Changes in Operating Profit 1. 4Q-2025 Actual → 1Q-2026 Forecast ¥1.5 billion Decrease ¥11.9 billion Decrease 24 (Billions of Yen) 4Q-2025 1Q-2026 Actual Forecast Net Sales 105.2 100.0 (5.2) Operating Profit (4.5) (6.0) (1.5) Exchange Rate (Yen/US$) 153.1 155.0 +1.9 Change 2. 1Q-2025 Actual → 1Q-2026 Forecast
Page 25
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Reference Materials 25 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION ■ Quarterly Trend FCST 26
Page 26
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION Reference Materials 25 4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION ■ Quarterly Trend FCST 26
Page 27
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION URL https://www.sumcosi.com/english/ 27
Page 28
4Q-2025 Results Feb. 10, 2026 SUMCO CORPORATION URL https://www.sumcosi.com/english/ 27