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Lam Research surges 17%, AMD and Micron follow as chip earnings reset the tape

7/31/2026

Strong earnings from Lam Research, Microsoft, and Arm reversed a run of selling pressure across semiconductor stocks, with Lam Research (LRCX) advancing 17% in the session. AMD (AMD) and Micron (MU) surged alongside it.

The three results together reset the tape for a group that had been hard-hit heading into the day. The catalyst: three prints, one direction Lam Research posted the headline move.

The company's strong earnings drove a 17% advance, the kind of single-session gain that reflects results arriving well above what the market had priced.

Microsoft (MSFT) and Arm (ARM) delivered strong prints of their own, and the combination gave semiconductor investors a broad-based signal rather than an isolated beat at a single name.

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