Lam Research's Margin Nears 50% but China Export Risk Keeps Thesis on Hold

What happened

Lam Research reported non-GAAP gross margin of 49.9% and guided to 50.5%, supported by AI-driven chip demand that boosted tool pricing power and revenue. The company's March 2026 quarter showed strong profitability with GAAP gross margin of 49.8% and operating margin of 35.0% on $5.84 billion revenue. However, the latest 10-Q reveals China still accounts for 34% of quarterly revenue and management warns that export license requirements are 'likely to materially and adversely affect' China sales. This policy overhang offsets the upbeat operational narrative, as any license denials could disrupt both systems shipments and installed-base serviceability. Meanwhile, the stock trades at a demanding 48x P/E, leaving no margin of safety should the China risk crystallize.

Implication

Near-term operational momentum from AI capex is real, with margins trending toward 50% and raised WFE guidance supporting a bullish base case. However, the 34% China revenue concentration and the explicit government license language create an asymmetric downside that is not discounted. Investors should wait until the next filing shows either a reduced China mix (≤25%) or sustained gross margins ≥50% to confirm the bull case. Until then, the stock is a show-me story where execution must outrun policy risk.

Thesis delta

The margin strength and guidance lift reinforce the AI-driven demand thesis and near-term operational momentum, supporting the bullish scenario of elevated WFE. However, the core thesis remains unchanged: the China export policy risk and high valuation (48x P/E) still present asymmetric downside that outweighs the positive catalysts. The WAIT rating is maintained, with the next quarterly results being the key test to see if margins hold at 50% while China mix declines.