SUMCO Swings to ¥5.3bn Operating Loss in Q1 as Silicon Wafer Demand Slumps

SUMCO Corporation (TSE: 3436), one of the world's two dominant suppliers of silicon wafers for semiconductors, swung sharply into the red in the first quarter of its December-ending fiscal year. For the three months from January to March 2026, the company reported consolidated revenue of ¥101,402 million, down 1.0% from ¥102,472 million a year earlier, while operating profit reversed from a ¥5,990 million profit to an operating loss of −¥5,273 million. Ordinary profit turned to a loss of −¥7,965 million (from +¥4,892 million), and net profit attributable to owners of the parent swung to a loss of −¥8,469 million, against a ¥3,047 million profit in the prior-year quarter. Loss per share came in at −¥24.22, compared with earnings of ¥8.71 a year ago.

The result marks a stark reversal for a company that had ridden the artificial-intelligence and data-center boom in prior years. While revenue held broadly flat, the collapse in profitability points to operating deleverage: as plant utilization falls, fixed costs at SUMCO's wafer fabs are spread across fewer shipped units, eroding margins disproportionately to the modest top-line decline. Comprehensive income for the quarter was a loss of −¥7,406 million.

What is pressuring wafer demand and utilization

SUMCO sits at the very base of the semiconductor supply chain, polishing the 300mm and 200mm silicon substrates onto which every chip is built. That position makes it an early casualty of inventory corrections: when chipmakers and their downstream customers carry excess stock, they cut wafer orders before they cut chip output. The quarter reflected exactly this dynamic — soft demand across several end-markets combined with ongoing inventory adjustments through the supply chain, forcing SUMCO to run its fabs below the utilization levels needed to cover fixed costs. With wafer pricing and volumes both under pressure, the company was unable to absorb depreciation and labor costs, tipping each profit line from positive to negative.

Balance sheet remains solid despite the loss

Despite the quarterly loss, SUMCO's balance sheet stayed robust. Total assets edged up to ¥1,142,822 million from ¥1,127,966 million at the prior year-end, while net assets eased to ¥640,437 million from ¥647,785 million as the net loss flowed through retained earnings. The equity ratio slipped to 49.8% from 51.3%, but remains comfortably near the half-capitalized mark, leaving the company with ample financial cushion to weather a downcycle and to continue investing in next-generation wafer capacity for AI and advanced-logic applications.

H1 guidance points to deeper loss; year-end dividend undecided

For the first half of FY2026 (the cumulative six months through June 2026), SUMCO guided for revenue of ¥213,400 million, up 3.9% year on year, but an operating loss of −¥7,700 million, an ordinary loss of −¥14,400 million, and a net loss of −¥15,400 million, equivalent to a loss per share of −¥44.04. The deeper bottom-line guidance signals that management expects the second quarter to remain loss-making even as revenue grows, consistent with continued weak utilization. On the shareholder return, SUMCO maintained a forecast interim dividend of ¥10 per share, but the year-end dividend is now undecided, revised from its prior forecast — a cautious posture that gives the board flexibility to size the payout once the depth and duration of the wafer downturn become clearer.

JapanStockPulse provides informational content only and does not constitute investment advice. Figures are taken from the company's published earnings short report and may be subject to subsequent revision.