Key Highlights

● Third-quarter Revenue of $280.55 million beat the $270.52 million forecast.

● Adjusted Earnings of $1.04 per share topped the 86 cents analysts expected.

● Fourth-quarter GAAP earnings were guided to 84 cents, below 93 cents in Q3.

● Part of the gross-margin beat came from one-time Tariff refunds.

FormFactor (NASDAQ:FORM) topped third-quarter forecasts, but a fourth-quarter outlook that pointed to lower earnings than the quarter just reported sent the chip-testing specialist sharply lower.

Beat now, step back later

FormFactor gave investors a strong third quarter and a softer road ahead, and the market chose to focus on the road. The stock tumbled on Thursday, October 29, closing among the biggest losers in the S&P SmallCap 600 after trading near $100.54 during the session, according to market data.

The company, which makes probe cards and test systems used to check semiconductors before they are packaged, reported third-quarter revenue of $280.55 million against a forecast of $270.52 million. Adjusted earnings came in at $1.04 per share, comfortably above the 86 cents analysts expected, according to market data.

Then came the guidance. FormFactor said it expects fourth-quarter revenue of about $285 million and GAAP earnings of 84 cents per share. That earnings figure sits below the 93 cents of GAAP earnings it posted in the third quarter. Revenue is set to edge higher, but profit is guided to slip.

The quality of the beat

Another report added a detail that may have tempered enthusiasm for the quarter itself. Part of FormFactor's gross-margin beat came from one-time tariff refunds, the report said. One-off gains flatter a single quarter but do not repeat, which helps explain why investors looked past the headline numbers and toward the outlook.

Market commentary also flagged valuation as a concern. After a strong run in semiconductor stocks, investors have become less willing to pay up for companies that cannot show steady earnings growth from one quarter to the next.

Chips had a rough day

FormFactor's drop came during a broad pullback in semiconductors. The PHLX Semiconductor index fell on Thursday, ending a four-day winning streak. Marvell (NASDAQ:MRVL) slid sharply on media reports that it is in advanced talks to acquire Lumentum (NASDAQ:LITE). Neither company has confirmed those talks. AMD (NASDAQ:AMD) also declined.

The bigger weight on technology was Alphabet (NASDAQ:GOOGL). The Google parent fell to $283.82, its worst day since its 2004 IPO, wiping out roughly $500 billion in Market Value after its results "reignited concerns over mounting AI costs," according to media reports. One market analyst said that "markets are no longer rewarding companies simply for investing heavily in AI."

The Nasdaq Composite lost 365.13 points to 26,184.72. The Russell 2000, by contrast, gained 28.71 points to 2,859.22 as investors rotated away from technology and toward other parts of the market.

Why guidance carries so much weight

For semiconductor test suppliers, quarterly guidance is a window into chipmakers' production plans. Probe cards are consumed as new chip designs ramp, so FormFactor's outlook offers an early read on how busy its customers' fabs will be. A softer earnings outlook can suggest a less profitable product mix or higher costs, even when revenue is stable.

With chip stocks priced for growth after a strong run, any hint that earnings may dip, even briefly, tends to draw a sharp response. Thursday was no exception.

What to watch

Investors will watch for any further detail from FormFactor on what is driving the expected dip in fourth-quarter earnings, and whether it reflects temporary costs or a shift in demand. The pace of spending by chipmakers on advanced packaging and memory testing will be central.

Sector news also matters. Intel (NASDAQ:INTC) slid sharply in after-hours trading on Thursday after weak fourth-quarter guidance, and any confirmation of the reported talks between Marvell and Lumentum could keep semiconductor sentiment volatile into November.