After a record-breaking financial report, it plunged 12% in a single day—where did Lam go wrong?

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After a record-breaking financial report, it plunged 12% in a single day—where did Lam go wrong?

Thursday, October 22, 2026

A quarterly report that set record records for revenue, profit, and earnings per share was met with an 11.76% single-day plunge—on October 22, Lam Research ($LRCX) closed at $230.15, the lowest since April, with trading volume expanding to 2.5 times the daily average over the past three months, and its market value evaporated by over $30 billion in a single day, leaving only $288 billion.

The problem isn't in the past, but in the future. September quarterly revenue was $8.22 billion, up 54.5% year-over-year, but only $8.6 billion was guided for December: just in line with the seller's consensus, but far below the buyers' price for AI expansion. The CFO's comment, "If not for recent supply chain constraints, the guidance would be even higher," combined with the indication that China's revenue share would clearly decline, pushed this device market leader, whose 12-month growth has soared 63.2%, directly below the 200-day moving average.

Is this a healthy expectation reset, or is it the first crack in the high-growth narrative?

Latest price $230.15 ▼ -11.76%

Quarterly revenue 8.22 billion USD ▲ Year-on-year +54.5%

Next quarter's guidance $8.6 billion — Quarter-on-quarter +4.6%

What they sell is not the machines, but the certainty of yield

Lam Research is a core supplier of global semiconductor front-end equipment, specializing in three critical processes that directly determine chip line width, film thickness, and defect rate—deposition, etching, and cleaning. Its customers span logic, memory, and mature process wafer fabs in the United States, China, South Korea, Taiwan, Japan, Southeast Asia, and Europe.

Its product lineup is quite complete

Deposition includes ALTUS, SABRE, Striker, and VECTOR; conductor etching includes Akara, Kiyo, Syndion, Versys; selective etching for advanced logic and storage covers Argos, Prevos, and Selis; cleaning includes Coronus, Da Vinci, DV-Prime, EOS, and SP series.

The real barrier lies outside the equipment. Once a etching machine enters mass production, replacing it means revalidation, yield ramp-ups, capacity losses, and schedule delays—no wafer fab would risk short-term price differences at the same time. The Reliant combination and Sense.i platform integrate multiple processes, while Vantex combines RF technology, inter-chip consistency, and equipment intelligence.

Scale itself is also a moat. For the fiscal year ending June 2026, the company will have revenue of $23.2 billion, a year-on-year increase of 26.0%, net profit of $7.27 billion, and earnings per share of $5.76; The large installed capacity base also brings ongoing revenue from customer service, spare parts, and upgrades, eliminating the need to rely solely on new wafer fab construction.

So, does it count as a monopolist? No. The report gives an irreplaceability score of 8/10, but lacks data on patent count, market share, and exclusive supply ratio. More accurately: it creates high switching costs in advanced process mass production qualifications and multi-equipment combinations, rather than being irreplaceable.

A 40x P/E ratio: are you buying growth or inertia?

Assuming EPS of $5.76 for fiscal year 2026, a stock price of $230.15 corresponds to a price-to-earnings ratio (P/E) of 39.96 times; The research report snapshot shows a price-to-sales ratio (P/S) of 11.65 times, price-to-book ratio (P/B) of 20.71 times, and an Enterprise Value Multiple (EV/EBITDA) of 27.92 times, but a free cash flow yield of only 2.71%.

The contrast between these figures is striking

Return on equity (ROE) reaches 55.66%, PEG is only 0.35, and the fundamental quality explains the high multiple; But a cash return of 2.71% means every dollar investors spend is betting on steady growth in the coming years.

The report uses 30 to 42 times the 2026 fiscal year EPS as the scenario range: 30 times indicates normalized growth and unresolved risk discounts; 36 to 37 times is mid-range; 42 times requires ongoing validation of AI demand. After the crash, the stock price remains in the upper half of this range, with the valuation conclusion being "reasonable" rather than "cheap." For specific buy/sell levels and real-time signals, see the official WeChat account.

On the cash flow side, operating cash flow for the September quarter was $3.5 billion, nearly double the $1.78 billion in the same period last year. After deducting $258 million in capital expenditures, there is still about $3.24 billion in free cash flow. During the quarter, it also repurchased $1.02 billion worth of shares and raised the quarterly dividend from $0.26 to $0.33. The company is fully self-sustaining and does not require external financing.

But the annual caliber is not going upward in a single direction

Operating cash flow for fiscal year 2026 is $5.86 billion, which is actually lower than the previous year's $6.17 billion, while operating profit jumped from $5.9 billion to $8.2 billion; Operating cash flow for the June quarter was only $1.46 billion. Profits have risen, so why hasn't cash kept pace?

Has the positive news already been priced into the stock price? ** The record-breaking September quarter was clearly already priced in by the 63.2% increase over 12 months. Today's cut cut is precisely the premium that "will significantly exceed expectations next quarter."

The company has long been mature, but the market is beginning to question the cycle

Lam is undoubtedly a mature enterprise: the world's leading wafer fuses are its customers, not test subjects, and its revenue, profit margins, and cash flow have all been validated over many years. Today's answer is not "can it be commercialized," but "whether mature businesses can enter a multi-year high growth cycle through AI and device complexity?"

The research report's assessment of cycle persistence is insufficient evidence

There are hard data showing surging demand, accelerated revenue, and margin expansion, but lacking independent evidence of price increases and supply constraints. The moving averages reveal the market's attitude—the stock price is about 25% below the 50-day moving average of $306.45 and 18.7% lower than the 200-day moving average of $283.18. The mid-term upward structure remains, but short-term confidence has already been broken.

Four competitors are competing for the same wafer fab budget

Applied Materials is the most direct comprehensive competitor, handling deposition, etching, ion implantation, and testing samples, with a broader product line; Lam is characterized by deeper penetration in conductor etching, selective etching, storage-related etching, and cleaning. Today, Applied Materials fell about 7% in tandem, indicating the market views this guidance as an industry signal.

Tokyo Electron covers adhesive development, etching, thin film deposition, and cleaning, directly competing with Lam in etching and deposition. Its presence means customers typically have multi-source solutions for critical processes. ASM International focuses on advanced deposition processes such as atomic layer deposition and epitaxy, applying more direct pressure to specific deposition processes.

KLA focuses on inspection and measurement, with few direct competitors, yet it competes for the same share of capital expenditure. The more advanced the process, the stronger the linkage between inspection, etching, and cleaning; the two are not simply substitutes.

If you compare a wafer fab to a precision kitchen, Lam is not the only stove supplier, but the hardest "main frying pan" to replace — changing the pan means reseasoning, retrying dishes, and delaying the opening. The moat does exist, but it is built on certification and yield records, not exclusive contracts.

The best way to verify this is to see if an operating profit margin around 40% can be maintained during the industry's expansion period: if it holds, pricing power is validated; if revenue rises but profit margins fall, competitive position must be reassessed.

A $200 billion industry story still needs orders to prove it

The report admits that there is a lack of verifiable data on the total wafer fab equipment market, storage proportion, and LAM share. Rumors circulating about industry equipment spending exceeding $200 billion by 2027 and TSMC's capital expenditures can only be considered as verifiable directions and cannot be directly included in benchmark forecasts.

The anchor points that can be confirmed come from the company itself

Fiscal year 2026 revenue is $23.2 billion, with a September quarter of $8.22 billion, and mechanical annualized about $32.9 billion, but this is not a company guidance. Using fiscal year 2026 as the base for a three-year sensitivity estimate, compound annual growth rates of 10%, 20%, and 30% correspond to approximately $30.9 billion, $40.1 billion, and $51 billion in revenue, respectively.

Where exactly is the ceiling? ** It depends on whether industry expansion can translate into stable or even increased market share—Applied Materials, Tokyo Electron, and ASM International are all sharing the same slice, and the most reliable measure of revenue and profit margins in the coming quarters is the real benchmark.

The confidence of the bulls comes from the numbers already pocketed

Lam bullish doesn't need to imagine long-term stories; the latest season's hard data already supports this:

▲ Bull Case

Bears do not deny earnings, only questioning whether "good enough lasts"

The logic behind bears isn't that companies are getting worse, but that when "growth is still good but not good enough," high valuations themselves are the reason for the decline:

▼ Bear Case

In the coming months, keep a close eye on these four things

Today's plunge has put all eyes on the "next validation," and the following events will determine whether this is an expected reset or a trend reversal:

•	December quarterly earnings report for late January 2027: Whether it can deliver revenue close to or above $8.6 billion and earnings per share of $2.33 is highly impactful
•	Easing of supply chain constraints: If delivery bottlenecks ease next quarter, suppressed revenue is expected to be recovered, which is a positive factor
•	The decline in China's revenue share: If the decline exceeds expectations, it will drag down total revenue and is somewhat negative
•	Whether operating profit margin can hold around 40% and whether operating cash flow can maintain the high level seen in the September quarter will have a significant impact
•	Whether the stock price can recover from oversold status, return above the 200-day moving average, and retest the 30 to 42 P/E ratio framework in the next 3 to 6 months will have an impact

A 60% increase in one year, a 20% drop in a month

Over the past 12 months, LAM's return rate reached 63.2%, driven by steadily increasing quarterly revenue: $5.32 billion in September 2025, $5.34 billion in December 2025, $5.84 billion in March 2026, $6.72 billion in June 2026, and then $8.22 billion in September, with earnings per share rising from $1.24 to $2.19.

The market bet on the acceleration of earnings driven by AI demand and device complexity this year. However, the 22.8% drawdown over the past 30 days, combined with today's plunge, reminds us of three other things: low cash returns, a past decline in annual cash flow, and the persistence of the cycle remains to be proven. The bullish growth direction has not been disproven, but the cost of chasing short-term acceleration at high multiples has already become apparent.

⚠️ Risk Notice • Normalization of growth has compressed the nearly 40-fold P/E ratio, raising the risk of valuation downward revisions • China's share of revenue has declined, and export control policies may tighten further • Ongoing supply chain constraints have led to delays in revenue recognition • Operating cash flow and net profit are not synchronized, raising doubts about profit quality • Competing products obtain customer qualifications at critical processes, weakening pricing power

🟡 Neutral Solid performance and full valuations—the next financial report will be the real judge

💬 Discussion The crash hasn't changed fundamentals, but high valuations haven't provided a safety cushion. Real-time buy and sell positions, post LRCX on the official account.

Data source

•	Source: NextPick real-time snapshot + Lam Research official quarterly earnings report and SEC 10-K and 8-K announcements + mainstream financial media and sell-side research reports.