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Formfactor stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+49.5% to $81.12
Formfactor (FORM) stock rose 50% over the last 252 sessions, to $81.12. On the way it reported 4 quarters, its insiders filed 8 open-market trades and 5 Form 144 notices of planned sales, and the company filed 3 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Oct 28, 2026 | Earnings | Earnings: beat the EPS estimate by 20.5% | +3.2% (+2.8% vs SPY) | −9.9% (−7.9% vs SPY) | — |
| Oct 14, 2026 | Form 144 | Form 144: Mike Slessor plans to sell $1.4M | −6.8% (−5.7% vs SPY) | −17.3% (−16.2% vs SPY) | — |
| Sep 16, 2026 | Form 144 | Form 144: Mike Slessor plans to sell $1.8M | +3.0% (+3.5% vs SPY) | +21.4% (+19.1% vs SPY) | +16.3% (+14.4% vs SPY) |
| Sep 3, 2026 | Form 144 | Form 144: Kelley Lynne Steven-Waiss plans to sell $202K | +0.2% (−0.9% vs SPY) | +14.9% (+15.9% vs SPY) | +43.4% (+42.6% vs SPY) |
| Sep 3, 2026 | Insider sale | Steven-Waiss Kelley sold $202K | +0.2% (−0.9% vs SPY) | +14.9% (+15.9% vs SPY) | +43.4% (+42.6% vs SPY) |
| Aug 14, 2026 | Form 144 | Form 144: Mike Slessor plans to sell $2.1M | −0.1% (+0.1% vs SPY) | −12.9% (−10.9% vs SPY) | −24.6% (−22.4% vs SPY) |
| Jul 29, 2026 | Earnings | Earnings: beat the EPS estimate by 34.4% | −5.6% (−4.0% vs SPY) | +31.0% (+27.0% vs SPY) | +20.3% (+17.0% vs SPY) |
| Jul 15, 2026 | Form 144 | Form 144: Mike Slessor plans to sell $560K | −0.4% (−0.8% vs SPY) | −2.2% (−1.8% vs SPY) | +10.1% (+7.4% vs SPY) |
| Jun 15, 2026 | Insider sale | St Dennis Thomas sold $424K | +9.2% (+7.4% vs SPY) | +11.8% (+11.2% vs SPY) | −18.4% (−20.4% vs SPY) |
| Jun 2, 2026 | Insider sale | Rhodes Sheri sold $794K | +8.4% (+8.2% vs SPY) | +7.7% (+10.2% vs SPY) | +24.6% (+26.0% vs SPY) |
| May 21, 2026 | Insider sale | Obregon-Jimenez Rebeca sold $484K | +2.1% (+1.9% vs SPY) | +3.8% (+2.1% vs SPY) | +22.3% (+21.6% vs SPY) |
| May 20, 2026 | Insider sale | White Brian C sold $410K | +6.7% (+5.7% vs SPY) | +12.7% (+10.4% vs SPY) | +24.4% (+22.3% vs SPY) |
| May 19, 2026 | 8-K | Directors and officers: departures, appointments, pay | +6.7% (+5.7% vs SPY) | +12.7% (+10.4% vs SPY) | +24.4% (+22.3% vs SPY) |
| May 19, 2026 | Insider sale | St Dennis Thomas sold $116K | −0.2% (+0.5% vs SPY) | +15.0% (+13.4% vs SPY) | +17.5% (+17.2% vs SPY) |
| May 15, 2026 | Insider sale | Steven-Waiss Kelley sold $678K | −1.4% (−0.1% vs SPY) | 0.0% (+0.7% vs SPY) | +17.6% (+16.7% vs SPY) |
| May 13, 2026 | Insider sale | Titinger Jorge sold $516K | −2.1% (−2.6% vs SPY) | −11.9% (−11.3% vs SPY) | −1.4% (−1.3% vs SPY) |
| Apr 29, 2026 | Earnings | Earnings: beat the EPS estimate by 27.6% | +1.0% (+1.0% vs SPY) | +7.7% (+6.1% vs SPY) | −3.0% (−8.9% vs SPY) |
| Feb 18, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.6% (−2.3% vs SPY) | +11.1% (+10.1% vs SPY) | +0.4% (+4.4% vs SPY) |
| Feb 4, 2026 | Earnings | Earnings: beat the EPS estimate by 30.6% | −4.3% (−3.8% vs SPY) | +22.3% (+21.9% vs SPY) | +14.9% (+16.1% vs SPY) |
| Jan 9, 2026 | 8-K | Exit or disposal costs | +6.3% (+6.2% vs SPY) | +13.2% (+13.5% vs SPY) | +30.7% (+31.0% vs SPY) |
Insiders’ record here
In the year on the chart, Formfactor's insiders reported 0 open-market buys ($0) and 8 sales ($3.6M). Of the 7 old enough to score, 6 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was — and after a sale −10.5%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 2.05 Exit or disposal costs | 954 | −0.2% | 47% | +0.5% | ±2.4% |
| 2.06 Material impairment | 334 | 0.0% | 50% | +0.4% | ±1.9% |
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
Report card: every quarter against the estimate → Formfactor: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.