Reiterate Sell: New optical products to ramp in 2H26, but near-term contribution is limited

Overview

This report is Goldman Sachs' earnings review of Win Semiconductors 3105.TWO. The report acknowledges that the company's 2Q26 core business and net profit were significantly better than Goldman Sachs' forecasts and market consensus, and it raises revenue, gross margin, and EPS forecasts for the next three years; however, the core investment conclusion remains cautious because growth in the handset PA foundry market is slowing, the competitive landscape is unfavorable, the company's valuation remains high, and AI-related optical products will contribute only limited revenue in 2026-2027.

Core views

Goldman Sachs maintains a Sell rating. Its main views include: first, 2Q26 operating performance exceeded expectations, driven by a higher mix of high-margin infrastructure business and lower expenses; second, 3Q26 revenue is expected to grow by low double digits QoQ, with optical business driven by ramp-up of new PD products and gross margin around the low-30% level; third, AI-related PD products are expected to ramp for a single customer in 2H26, while LD products include CW laser and EML solutions, but more meaningful contribution is expected in 2027/28; fourth, weak handset demand and high memory prices are weighing on end demand, prompting Goldman Sachs to cut its 2026/27/28E PA foundry TAM forecasts; fifth, even after earnings forecast revisions upward, the current valuation is still difficult to justify based on near-term optical contribution.

Analysis framework

The report uses an earnings variance analysis, segment revenue outlook, TAM revisions, competitive landscape assessment, and a target P/E valuation framework. Goldman Sachs compares 2Q26 results with its own forecasts and Bloomberg consensus, and updates 2026-2028 revenue, gross margin, EPS, and target price based on the company's 3Q26 guidance, capacity utilization, capex direction, and end-handset shipment assumptions.

Methodology notes

• Valuation methodsTarget P/E valuation method

  Calculate the 12-month target price using 24x 4Q26-3Q27 EPS

  Goldman Sachs maintains its target P/E at 24x, one standard deviation below the industry's average valuation during the upcycle, and rolls the valuation period from 2H26-1H27 to 4Q26-3Q27.

• Industry analysisPA foundry TAM and share analysis

  Assess PA foundry market size using smartphone shipments, 5G penetration, and foundry penetration

  Goldman Sachs cuts 2026/27/28E PA foundry TAM to US$1.3bn/1.4bn/1.6bn, and expects 2025-2030E TAM CAGR of 11%.

• Company fundamentalsProduct mix and capacity utilization analysis

  Gross margin is jointly driven by utilization and the mix of high-margin businesses

  2Q26 GPM increased by 1.9 percentage points QoQ. Management said capacity utilization rose from 60% in 1Q26 to 65% in 2Q26, and Goldman Sachs expects it may further increase to around 70%.

Asset mapping & comparison

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

• Win Semiconductors Corp. (3105.TWO)

  Research target; Taiwanese GaAs semiconductor foundry company

  Strengths

  2Q26 results beat expectations; higher contribution from high-margin infrastructure and optical businesses; AI-related PD/LD products have long-term growth potential; long-term beneficiary of rising PA complexity, WiFi 6E/7, AR/VR, automotive LiDAR, satellite communications, and datacom optical opportunities.

  Weaknesses

  Handset PA foundry demand is affected by weak global smartphone shipments and high memory prices; the company's product pricing is higher than peers, creating pressure on market share; datacom optical business has a limited near-term revenue contribution.

  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

  The main upside risks to the rating include easing competition in China's PA foundry market, faster-than-expected 5G/WiFi 7 upgrades, and faster-than-expected growth in LEO/AI-related businesses.

• DIODES INC (DIOD.US)

  A semiconductor company appearing in entity recognition, but the core analysis of the report is not centered on this company

  Strengths

  The source material does not provide evidence of strengths directly relevant to the investment conclusion of this report.

  Weaknesses

  The source material does not provide evidence of weaknesses directly relevant to the investment conclusion of this report.

  Comparison

  Not a core comparison object for Win Semiconductors' valuation or rating.

  Risks

  No specific risk evidence is provided in the source material.

Key data

• RatingSellGoldman Sachs maintains a Sell rating.
• 12-month target priceNT$142Raised from NT$124 to NT$142.
• Current priceNT$341.50Price disclosed in the report.
• Implied downside58.4%Based on the target price and current price.
• 2Q26 operating profit performanceAbove GSe/Bloomberg consensus by 56%/5%Mainly driven by product mix improvement and lower expenses.
• 2Q26 net profit performanceAbove GSe/Bloomberg consensus by 114%/52%Including NT$447mn of non-operating income, accounting for 38% of pre-tax profit.
• 3Q26 revenue guidanceLow double-digit QoQ growthOptical business is expected to post the strongest growth, and infrastructure business is also expected to grow strongly.
• 2026/27/28E revenue forecast revision+6%/+7%/+3%Reflects 2Q26 results and higher contribution from infrastructure and optical businesses.
• 2026/27/28E EPS forecast revision+46%/+4%/+7%Earnings forecasts were revised up, but the rating is unchanged.
• 2026E datacom optical revenue mixHigh single digitsDespite multiple-fold YoY growth, near-term contribution remains limited.
• Valuation multipleAbove 33x 2027E P/EBased on GSe/Bloomberg consensus, even after the share price has corrected by more than 30% since the last earnings release.

Impact & implications

For investors, the key implication of the report is that Win Semiconductors' near-term earnings and new business progress have indeed improved, but this is more a reason for upward revisions to earnings forecasts and target price than a sufficient condition to change the rating. Goldman Sachs believes the market may be pricing in the long-term potential of AI optical business too early, while the company's revenue in 2026-2027 will still be mainly driven by handset PA and infrastructure businesses; if handset end demand remains weak or competition intensifies, the current valuation faces downside risk.

Risks

• If premium smartphone prices rise further due to high memory prices, end demand could be suppressed.
• If competition in China's PA foundry market intensifies, Win Semiconductors' relatively high pricing may cause continued share pressure.
• If ramp-up of datacom optical PD and LD products is slower than expected, AI-related business may provide insufficient support for revenue and gross margin.
• If 5G/WiFi 7 upgrades, LEO, or AI-related businesses grow faster than expected, this could pose upside risk to the Sell rating.

What to watch

• Whether 3Q26 revenue achieves low double-digit QoQ growth.
• Whether gross margin remains stable in the low-30% range, and whether capacity utilization can further approach around 70%.
• The ramp-up pace of new PD products in 2H26 and customer concentration risk.
• The commercialization contribution of LD products, including CW laser and EML solutions, in 2027/28.
• Whether global smartphone shipments and demand for premium models continue to be affected by memory prices.
• Changes in PA foundry TAM, foundry penetration, and Win Semiconductors' market share.