Global silicon wafer market: Bernstein sees a global ex-China silicon-wafer shortage emerging from late 2027 as demand accelerates faster than capacity.

Overview

Bernstein updates its silicon-wafer supply-demand outlook, arguing that stronger memory and advanced-logic demand, restrained ex-China capacity additions, and tightening Chinese domestic demand could produce an ex-China wafer shortage from late 2027. The report also updates Sumco forecasts and retains its Market-Perform rating.

Core views

Bernstein raises its global raw silicon-wafer demand forecast for 2025-28 to a 14% CAGR from 12% previously. The revision reflects higher expected DRAM and logic fab capacity: DRAM wafer demand is projected to grow 16% annually, NAND wafer usage 14%, and logic wafer demand 12%. The report identifies AI-related memory and leading-edge logic as important drivers. HBM consumes three to four times as many wafers per bit as DDR5, NAND wafer-to-wafer bonding separately fabricates logic and memory cells before bonding, and backside power delivery requires two wafers per advanced-logic chip. China demand is forecast to grow 19%, versus 11% for ex-China demand, supported by semiconductor localization. On supply, Bernstein forecasts global ex-China wafer capacity to grow only about 5% annually in 2025-28. The top five suppliers hold more than 90% of the market, and post-COVID oversupply has kept producers focused on technology upgrades and utilization recovery rather than greenfield construction. Potential brownfield expansion from Shin-Etsu, Sumco, GlobalWafers and Siltronic is estimated at about 380,000 wafers per month, or 6% of those companies' current supply. GlobalWafers is the principal major-project exception: its Sherman, Texas 300mm facility opened in May 2025, supported by up to $406 million of CHIPS Act grants, while Micron has provided $500 million of strategic financing alongside a 10-year supply agreement. However, further greenfield projects require higher returns and new pricing negotiations, and projects announced after 2027 renewals would not be available until 2029. The report expects Sumco and Shin-Etsu to seek better pricing when long-term agreements renew. Sumco has added 300mm capacity in 2025-26 but delayed or cancelled two planned new plants in Saga Prefecture, with its METI subsidy reduced from ¥75 billion to ¥19.3 billion. It will focus on capability upgrades rather than volume before renegotiating LTAs at the end of 2027. Bernstein expects Sumco to seek materially higher prices, potentially including existing capacity, while Shin-Etsu seeks a more sustainable long-term pricing framework closer to cost-plus. These conditions, combined with demand growth, lead Bernstein to expect the ex-China market to enter shortage from late 2027 and see a widening gap thereafter. China remains central to the shortage scenario. Chinese supply is still projected to grow at a 17% CAGR in 2025-28, compared with 5% ex-China, although this is down from a 34% CAGR in 2022-25. China is expected to account for 29% of global wafer capacity in 2025 and 35% in 2028. Yet Bernstein now sees domestic Chinese demand growing 24% annually, up from 18%, driven by accelerated capacity expansion at CXMT and YMTC. This exceeds projected Chinese wafer supply growth and should reduce Chinese suppliers' room to expand overseas sales. Under the scenario that Chinese suppliers remain largely domestic, Bernstein estimates ex-China supplier utilization reaches 97% in 2027 and 102% in 2028. Chinese suppliers' utilization is expected to rise from 60%+ currently to 75% in 2028 on domestic demand alone, reducing the need to serve non-China demand, though their growing local share would still pressure Shin-Etsu's and Sumco's China sales. For Sumco, Bernstein adjusts forecasts for the deconsolidation of Formosa Sumco Technology, which represented 14.5% of Sumco's 2025 revenue. Sumco reduced its stake to 38.0% from 43.2% on 20 August and will cease consolidating FMT from the end of 3Q26; Bernstein reduces sales and operating-profit forecasts accordingly while including Sumco's 38% attributable share of FMT net profit under the equity method. It also raises Sumco's 12-inch capacity assumption by 50,000 wafers per month from 2H26 through expected yield and efficiency improvements, and incorporates a 10% 2028E ASP increase after late-2027 LTA renewals. The resulting revisions lower Sumco's 2027E revenue by 5% and operating profit by 11%, but raise 2028E revenue by 4% and operating profit by 11.5%. In Bernstein's 10% price-hike base case, 2028 EPS is ¥212 and the current share price equates to 14.3x 2028 P/E, near the historical 16x average. A 20% or 40% price increase would raise 2028 EPS to ¥324 or ¥549, implying 9.3x or 5.5x P/E at the cited current share price. Bernstein calls the post-correction setup a possible tactical opportunity for short-term, more speculative investors, but stresses that no pricing upside is expected before 2028. It therefore maintains Market-Perform and a ¥3,290 target price, valued at 2x 2027E BVPS of ¥1,644.

Analysis framework

Bernstein updates a bottom-up raw-wafer supply-demand model by segmenting demand into DRAM, NAND and logic, separating China from ex-China, and comparing projected demand with announced capacity additions and utilization. It then translates the tighter market outlook into Sumco capacity, pricing, earnings and valuation scenarios, while incorporating the FMT deconsolidation.

Methodology notes

• Industry AnalysisSupply-demand framework

  Raw silicon-wafer supply-demand modeling by geography and end market

  The report compares projected wafer demand with capacity growth, utilization and potential Chinese exports to assess when shortages may emerge.

• Industry AnalysisVolume-price decomposition

  Sumco earnings sensitivity to wafer-price increases

  Bernstein models 0%, 5%, 10%, 20% and 40% price-hike cases to show the impact on 2028 revenue, operating profit, margin and EPS.

• Valuation methodsPB valuation

  Price-to-book valuation

  The ¥3,290 Sumco target price is based on a 2x multiple of Bernstein's 2027 BVPS estimate of ¥1,644.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Sumco Corp (3436.JP)

  Covered wafer supplier positioned to benefit from tighter ex-China wafer supply and potential post-renewal price increases.

  Strengths

  Potential 2028 pricing leverage, expected 50,000-wafer-per-month capacity improvement from 2H26, and a tighter supply-demand outlook.

  Weaknesses

  FMT deconsolidation reduces near-term sales and operating-profit forecasts; LTAs are not expected to be renegotiated until late 2027.

  Comparison

  Shin-Etsu is also expected to pursue improved long-term pricing, while GlobalWafers has the most sizable announced expansion projects.

  Risks

  Weaker electronics demand, slower inventory digestion, Chinese competitors catching up, and unfavorable exchange-rate movements.

Key data

• Global raw-wafer demand CAGR, 2025-2814%Raised from 12% previously.
• DRAM / NAND / logic wafer-demand CAGR, 2025-2816% / 14% / 12%DRAM is supported by fab capacity and HBM; NAND by wafer-to-wafer bonding; logic by leading-edge AI demand.
• Ex-China wafer-supply CAGR, 2025-285%Limited by restrained expansion plans and modest brownfield capacity.
• China domestic wafer-demand CAGR, 2025-2824%Raised from 18%, exceeding China's 17% projected wafer-supply CAGR.
• Ex-China utilization in China-domestic scenario97% in 2027; 102% in 2028Bernstein's scenario assumes Chinese suppliers do not address overseas demand growth.
• Sumco 2028E EPS, 10% price-hike base case¥212The cited current share price represents 14.3x 2028E P/E.
• Sumco target price¥3,290Based on 2x 2027E BVPS of ¥1,644.

Impact & implications

The report argues that wafer suppliers outside China could gain pricing leverage when LTAs renew in late 2027 because demand growth is expected to exceed available supply. For Sumco, this potential earnings upside is deferred to 2028 and remains dependent on successful price negotiations, which is why Bernstein retains Market-Perform despite its constructive industry outlook.

Risks

• A weaker global economy could reduce electronics demand and wafer demand.
• Slower inventory digestion could delay improvement in wafer-market conditions.
• Chinese competitors may catch up faster than expected.
• Unfavorable exchange-rate movements could pressure Sumco's outlook.
• Price increases before 2028 remain uncertain because Sumco is not expected to renegotiate LTAs until late 2027.