StarPower Semiconductor: Margin Pressure Beyond the Cycle

Core Conclusion

StarPower Semiconductor's IGBT cyclical recovery is underway but the stock's equal-weight rating reflects our view that structural gross margin compression from depreciation, raw material costs, and auto customer pricing power will offset any volume upside. At 63x NTM P/E, valuation sits at the historical mid-range, offering no margin of safety given 52%/30% EPS cuts for 2026/27. We see no near-term catalyst for re-rating.

What the Market May Be Underestimating

The market appears to be pricing in a standard IGBT upcycle recovery, ignoring that StarPower's transition from fabless to fab-lite in 2021 created a permanent depreciation burden that will persist until capacity utilization rises materially. This structural cost layer is not cyclical.

Investors also may be overly optimistic about new business timelines for MCU and SiC. These product lines require significant R&D investment before generating material revenue, with higher R&D expense directly depressing 2026-2027 earnings. The 52%/30% consensus EPS cuts reflect exactly this timing risk.

Evidence Chain

IGBT Price Cycle Has Bottomed, But Margin Pressure Is Structural

IGBT pricing has declined for 2.5 years since 1Q23 as domestic capacity expanded aggressively. However, foreign peers began raising prices in 2025 as they reallocated capacity to AI-related MOS, and domestic utilization rates reached high levels. This confirms the cyclical trough.

Yet three structural margin pressures remain:

1. Depreciation burden: The fab-lite model shift in 2021 added fixed asset depreciation that did not exist under the fabless model. Until capacity utilization rises to absorb this cost, gross margins will remain compressed.

2. Raw material cost pass-through limited: Auto exposure (~50%+ of revenue) means StarPower faces downward pricing pressure from EV OEMs as vehicle ASPs decline. The company cannot easily pass through higher metal and substrate costs.

3. SiC substitution risk: Declining SiC device prices are making IGBTs less competitive in EV and industrial applications, accelerating the structural share loss of IGBTs.

New Business Diversification Is Correct but Delayed

StarPower's multi-product strategy includes IPM for home appliances, automotive and industrial MCU, SiC modules, driver ICs, and control chips. This is strategically sound to reduce IGBT cycle dependency.

However, meaningful revenue contributions from these businesses will take multiple years. The immediate impact is higher R&D expense that lowers near-term profitability. The 2026/27 EPS cuts of 52%/30% directly reflect this trade-off.

Valuation Lacks Upside Catalyst

At 63x NTM P/E, the stock trades in the middle of its 5-year historical range of 27-101x. While StarPower has the highest auto exposure (~50%) among domestic power semiconductor peers, this premium is already reflected in valuation. Without margin recovery evidence or new business breakthroughs, we see no catalyst for multiple expansion.

Key Disagreements and Risks

Upside risk: If domestic EV wholesale volumes recover faster than expected, volume-driven operating leverage could absorb depreciation faster, allowing gross margin recovery ahead of our forecast.

Downside risk: Accelerating SiC price declines could trigger faster-than-expected IGBT substitution in both EV and industrial segments, further compressing StarPower's core product demand. This is the primary structural risk.

Second-order risk: Continued weak China EV wholesales (down 1% YTD Jan-Apr 2026) combined with customer pricing pressure could keep gross margins depressed longer, while new business delays extend the period of elevated R&D expense.

Valuation or Trade Implication

Our Rmb120 target price reflects 63x NTM P/E on our lowered 2026/27 EPS estimates (52%/30% cuts) and our 2028 forecast. This multiple sits at the historical mid-point, with no margin of safety. The stock offers no clear upside catalyst. We maintain Equal-weight, waiting for evidence of gross margin inflection or sustained new business revenue growth.

Appendix Data Summary (Selected)

Table 1: Gross Margin Structure Breakdown

Table 2: Domestic Power Semi Auto Exposure & Valuation Comparison