Goldman Sachs reiterates Sell on Win Semiconductors Corp.; optical communications ramp is insufficient to support the high valuation

Overview

This is a Goldman Sachs 2Q26 earnings review of Win Semiconductors Corp. (3105.TWO). The report acknowledges that the company's 2Q26 core business performance was better than expected and that its 3Q26 revenue and gross margin guidance was relatively solid, but it believes the market is pricing in too much near-term contribution from AI-related optical communication products. Goldman Sachs raised its earnings forecasts and target price while maintaining a Sell rating.

Core views

The core views are: first, the 2Q26 beat was mainly driven by product mix improvement, a higher infrastructure business mix, lower expenses, and recognition of non-operating income; second, the optical business, especially PD products, will ramp in 2H26, while LD products will contribute more meaningfully in 2027/28, but datacom optical revenue may still account for only a high-single-digit percentage of revenue in 2026; third, handset PA foundry demand is pressured by weak global smartphone shipments and high memory prices, leading to a cut in industry TAM; fourth, although Win Semi can still benefit from rising PA foundry penetration, its market share is expected to decline from 74% in 2020 to 52% in 2026, and further to 40%-50% by 2030; fifth, the current valuation is above the average level seen during downcycles, and the near-term contribution from new optical businesses is insufficient to support the valuation.

Analysis framework

The report uses a combination of earnings comparison, company guidance, business segment outlook, industry TAM forecasts, competitive landscape analysis, and P/E valuation. Goldman Sachs compares actual 2Q26 results with GSe and Bloomberg consensus, then adjusts its 2026/27/28E revenue, gross margin, and EPS forecasts accordingly, and finally derives the target price using a target P/E multiple on a rolled-forward valuation period.

Methodology notes

• Valuation methodsTarget P/E method

  24x 4Q26-3Q27 EPS

  The 12-month target price of NT$142 is based on 24x 4Q26 to 3Q27 EPS, which is one standard deviation below the industry's average valuation during upcycles.

• Industry forecastPA foundry TAM

  Total addressable market for PA foundry

  Due to lower smartphone shipment assumptions, Goldman Sachs cut its 2026/27/28E PA foundry TAM forecasts by 1%/1%/4% to about US$1.3bn/1.4bn/1.6bn.

• Factor frameworkGS Factor Profile

  Growth, financial returns, valuation multiples, and composite factors

  Goldman Sachs Factor Profile provides context for investment judgment by comparing a stock's growth, financial returns, valuation multiples, and composite percentiles versus the market and industry peers.

Asset mapping & comparison

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

• Win Semiconductors Corp. (3105.TWO)

  Research coverage target

  Strengths

  2Q26 results beat expectations, with infrastructure and optical businesses driving product mix improvement; the company is a key GaAs foundry player with about 49% global share in 2025; AI-related PD products begin ramping in 2H26, and LD products have medium- to long-term opportunities.

  Weaknesses

  Handset PA demand is weak, and PA foundry TAM has been cut; the company trades at a higher valuation relative to peers and faces market share pressure; datacom optical revenue is still expected to account for only a high-single-digit percentage of revenue in 2026.

  Comparison

  Goldman Sachs believes competitors such as AWSC may be better positioned to gain share due to lower cost structures and more competitive pricing.

  Risks

  If competition in China's PA foundry market eases, 5G/WiFi 7 upgrades progress faster than expected, or LEO or AI-related business grows faster than expected, these could pose upside risks.

Key data

• RatingSellGoldman Sachs maintains a Sell rating.
• 12-month target priceNT$142Raised from the previous NT$124.
• Current priceNT$341.50As of the close on July 24, 2026.
• Implied downside58.4%Downside disclosed on the front page of the report.
• 2Q26 revenueNT$5,257mn3% above Goldman Sachs' forecast and 1% below Bloomberg consensus.
• 2Q26 operating profitNT$742mn56% above Goldman Sachs' forecast and 5% above Bloomberg consensus.
• 2Q26 EPSNT$2.30114% and 52% above Goldman Sachs' forecast and Bloomberg consensus, respectively.
• 2026/27/28E EPS revisions+46%/+4%/+7%Goldman Sachs raised forecasts due to 2Q26 results and higher contributions from infrastructure and optical businesses.
• 2026 CAPEX guidanceNT$2-3bnMostly for optical and infrastructure businesses rather than GaAs capacity expansion.

Impact & implications

In terms of investment implications, the report distinguishes between near-term earnings improvement and longer-term valuation pressure. While AI-related optical products, infrastructure business, and utilization improvement support higher earnings forecasts, Goldman Sachs believes these positive factors will make only limited revenue contributions in 2026 to 2027 and cannot offset the downside risks from weak handset PA demand, intensifying competition, and elevated valuation.

Risks

• If competition in China's PA foundry market eases, Win Semi's market share and earnings outlook could improve.
• If 5G and WiFi 7 upgrades proceed faster than expected, demand for handset and connectivity-related PAs could increase.
• If LEO or AI-related business grows faster than expected, contribution from optical and infrastructure businesses could improve.
• If price increases in premium smartphones suppress end demand, handset PA business could face further pressure.

What to watch

• The actual ramp speed and gross profit contribution of the new PD product for a single customer in 2H26.
• Customer adoption and revenue contribution in 2027/28 from LD products, including CW laser and EML solutions.
• Whether the 3Q26 guidance for low double-digit quarter-on-quarter revenue growth and gross margin in the low-30% range can be delivered.
• Whether GaAs utilization can improve further from 65% in 2Q26 to around 70%.
• The impact of smartphone shipments, memory prices, and premium handset demand on PA foundry TAM.
• Pricing strategies of competitors such as AWSC and changes in Win Semi's market share.