FormFactor Stock Climbs 29% On A 6-Day Winning Streak

A six-day run has sharply changed the stock's recent trajectory, but the underlying numbers may tell a different story.

FormFactor (FORM) stock has now moved higher for 6 consecutive trading days, gaining a cumulative 29% over the period. That streak has added about $2.3 billion to the company's market value, which now stands at about $10 billion.

For anyone holding the stock, this recent run has been a sharp reversal. The gain sits inside a trailing three-month window where the stock's total return is -7.2%.

The Streak Next To The S&P 500

Here is how FORM stock stacks up against the S&P 500 over the streak and the periods around it:

Is the price getting ahead of the business?

The data suggests a valuation that has moved faster than its fundamentals. FormFactor stock trades at about $131.26 a share as of 9/23/2026. Its price-to-earnings multiple is 88.7, well above the median of 36.7 among its S&P 500 Information Technology sector peers.

The company's operating margin over the last twelve months is 14.5%, which is below the sector median of 21.6%. Revenue growth over the same period was 18.0%, roughly in line with the median of 17.9%. The sources for this note do not show a specific reason for the recent move. The run has been the stock's own, as the S&P 500 returned +1.6% over the same 6 trading days.

What does a streak like this actually tell you?

A streak is information, not an instruction. It tells you that a stock has captured the market's attention and has strong near-term momentum. It does not, by itself, say whether the new price is justified or if the run will continue.

The disciplined next step is always the same: check the business against the price. The numbers here provide a starting point for that work, showing a stock with a high multiple and a lower operating margin than its peers.

If you are hunting for strength that has more behind it than a hot tape, our Guidance Momentum screen surfaces the names where management raised its own outlook, which is the kind of momentum that tends to persist.

Prefer the theme to this single name? Our ETF Scorecard shows how the technology funds stack up. Any one of those funds is still a concentrated bet on that one theme, though, which is exactly the gap the portfolio below closes.

Momentum Is A Tailwind, Not A Plan

Riding a stock that rises every day feels effortless, and that is precisely the danger: the same momentum that built this run can reverse without notice, and one name's reversal should never be able to reset your whole year.

That is what the Trefis High Quality (HQ) Portfolio is for: about 30 quality businesses screened for the fundamentals that survive momentum's mood swings, held with rules. It has a track record of outpacing a benchmark that combines the three major indices - the S&P 500, S&P Mid-cap, and Russell 2000. Watch the runs; own the resilience.