Lam Research Just Posted Its First-Ever 40% Operating Margin But Sold Off
Lam Research reported record revenue of $8.22B, a 40% operating margin, and EPS of $2.20, beating estimates. Shares fell 7.38% after hours as December guidance met expectations. China's revenue share rose to 35% but is expected to decline. CEO Tim Archer cited supply chain constraints and operational execution. The stock is down 1.00% in regular trading.
How this was made

The 30-second read
Why it matters
The earnings release introduced new guidance that failed to excite investors, leading to immediate price weakness.
Market read
The earnings and guidance update for a major chip‑equipment supplier directly affect its valuation and have spill‑over effects on the broader semiconductor equipment sector.
What to watch
Potential upside from upcoming AI data‑center spend and long‑term memory‑chip demand may not be fully priced in yet.
Background
Lam Research posted record Q3 revenue and margins, but its December‑quarter outlook was only in line with consensus, prompting a sell‑off.
Ticker impact
Lam Research reported Q3 results with record 40% operating margin and gave December guidance that barely met expectations, causing the stock to fall 7% in after‑hours trading.
likely further downside as investors price in weaker-than‑expected guidance and supply‑chain constraints
Guidance ranges were narrow and below consensus on the low end; the after‑hours sell‑off shows market reaction already underway.
Market effects
The results highlight the sensitivity of semiconductor equipment makers to margin guidance and China demand, potentially affecting peers in the chip‑making supply chain.
Weakening outlook for China exposure may pressure other US‑listed equipment firms with significant Asian sales.
Margin pressure and supply‑chain constraints in the semiconductor sector could temper broader AI‑related rally.
Counterpoint
If December revenue holds above the low end and margin expands as forecast, the stock could rebound sharply from the over‑reaction.
Key entities
- CompanyLam Research
Semiconductor equipment manufacturer (NASDAQ:LRCX).
- ExecutiveDoug Bettinger
Chief Financial Officer of Lam Research who presented the results.


