Lam Research falls 11.8% after warning of supply constraints and China revenue decline

What happened

Lam Research (LRCX) fell 11.8% on October 22, 2026, after the company reported fiscal first-quarter 2027 results that included record revenue but warned of supply constraints and expected revenue declines from China. The company delivered record revenue of $8.22 billion and earnings per share of $2.20, and management said wafer fabrication equipment demand topped $200 billion for 2027, according to Benzinga and Zacks Investment Research. Analysts trimmed forecasts following the release, and Barrons and Benzinga reported the company flagged supply constraints that could limit shipments.

How big was the move

The stock closed at $230.15, trading 2.6 times its 20-day average volume as investors reacted to the quarterly update. The move was 2.8 times a typical daily move for this stock and was 10.2 percentage points worse than the Technology sector median, which fell 1.5% while the S&P 500 fell 1.2%. Over the last five sessions the stock fell 17.1% compared with the S&P 500's five-session fall of 1.0%. Market value stood at $330.30 billion and the stock opened 10.1% below the previous close. Earnings were released at this session, so the results were the direct cause of the move.

The technical picture

The stock sat 24.3% below its 20-day moving average and 24.4% below its 50-day moving average, while it was 18.8% below its 200-day moving average. The 50-day average is above the 200-day average, a sign of an established uptrend, yet the Relative Strength Index (14 days) registered 25 (below 30, a level often called oversold). Shares were 47.5% below the 52-week high. Over one month the stock fell 25.1% and over three months it fell 24.6%, though over one year it rose 58.7% and is 44.9 percentage points ahead of the S&P 500. Volatility was 67% annualized over 60 days, higher than 94% of its own readings over five years.

The contrast is stark: the one-year gain signals strong momentum into a market that has since re-priced risk. The oversold RSI and sharp decline versus the sector suggest technical selling amplified the reaction to the earnings news and guidance. Higher-than-normal volatility reflects the speed of the move.

Fundamentals and valuation

For the four quarters through September 27, 2026, Lam reported revenue of $26.13 billion, which grew 33.4% from a year earlier and accelerated from growth of 26.0% one quarter earlier. Diluted earnings per share were $6.71, which rose 47.8% from a year earlier. Gross margin was 51.1% (a year earlier: 49.3%) and operating margin was 37.0% (a year earlier: 33.0%). Free-cash-flow margin was 25.0% and return on invested capital was 40.8%. The balance sheet showed net cash of $3.70 billion and share count over one year decreased by 1.1%.

Those fundamentals underline why the stock had been richly valued: accelerating revenue, expanding margins and strong cash generation point to high-quality earnings. Yet the market focused on management's warning about shipment timing and a China slowdown, showing how near-term operational risks can outweigh strong trailing results.

Valuation metrics showed the stock at 34.3 times trailing earnings, a level higher than 81% of its own readings over the past five years (five-year median: 24.4 times earnings), and 24.2 times expected forward earnings. Free-cash-flow yield was 2.0%. At those multiples, investors are pricing in continued strong growth; the recent analyst cuts and the company’s caution on China and supply constraints are the variables that could test that premium.

Earnings and analyst expectations

Lam's last report on October 21, 2026, showed earnings per share of $2.20 against $2.18 expected, 0.9% above estimates. That extended a streak to 10 consecutive quarters beating estimates and an average surprise over the last four reports of 6.3% above estimates. Typical two-day reaction after recent reports was that the stock fell 0.1%. The company set its next report for January 27, 2027. Analysts maintained a consensus price target of $375.68, 63.2% above the closing price, based on ratings from 50 analysts with 78% of them at Buy or Strong Buy and a consensus rating of Buy.

PromtFinance scores rank Lam’s Growth at 84 (Strong), Revisions at 83 (Strong) and Quality at 74 (Positive), while Value is 34 (Weak) and Momentum is 56 (Neutral). Those scores encapsulate the trade-off facing investors: high-growth and strong revisions alongside a valuation that sits toward the top of its historical range.

What to watch

• January 27, 2027: next quarterly report date
• Management's commentary on supply constraints and shipment timing given the company warned constraints could limit shipments (Barrons and Benzinga)
• Any revised regional revenue guidance, particularly expected revenue declines from China reported after the quarter
• Updates to analyst models and consensus given analysts trimmed forecasts following the earnings release
• Trading volume relative to its 20-day average in the days after the report (it traded 2.6 times its 20-day average on the session)