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Formfactor Inc (FORM)
NASDAQ: FORM · Real-Time Price · USD
Technology · Semiconductor Equipment & Materials
102.08+3.56 (+3.62%)
Insider Score
––Not scored
FORM Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
FORM Stock Insider Trading Activity
FORM stock’s insider trading shows 16 sales on the open market for an estimated $5.78M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| SLESSOR MIKE CEO | Sell | 1,200 | $125.92 | $151.10K | 0.3% | 455,596 | Oct 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 2,195 | $124.23 | $272.68K | 0.5% | 464,499 | Oct 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 7,703 | $125.36 | $965.65K | 1.7% | 456,796 | Oct 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 1,000 | $105.80 | $105.80K | 0.2% | 466,694 | Sep 16, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 8,737 | $104.26 | $910.92K | 1.8% | 475,467 | Sep 16, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 7,773 | $105.12 | $817.10K | 1.6% | 467,694 | Sep 16, 2026 | — | Form 4 |
| STEVEN-WAISS KELLEY Director | Sell | 2,100 | $96.10 | $201.81K | 7.9% | 24,426 | Sep 3, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 5,535 | $132.50 | $733.39K | 1.1% | 484,890 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 1,125 | $131.65 | $148.11K | 0.2% | 490,425 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 686 | $133.33 | $91.46K | 0.1% | 484,204 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 2,892 | $129.55 | $374.66K | 0.6% | 494,832 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 2,482 | $128.72 | $319.48K | 0.5% | 497,724 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 3,282 | $130.54 | $428.43K | 0.7% | 491,550 | Aug 14, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Option exercise | 141,792 | — | — | 32.6% | 576,494 | Aug 7, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Tax withheld | 78,908 | $117.39 | $9.26M | 13.7% | 497,586 | Aug 7, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Option exercise | 5,908 | — | — | 1.2% | 503,494 | Aug 7, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Tax withheld | 3,288 | $117.39 | $385.98K | 0.7% | 500,206 | Aug 7, 2026 | — | Form 4 |
| McKinnis Aric Brendan CFO | Option exercise | 1,099 | — | — | 8.2% | 14,426 | Aug 6, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Tax withheld | 3,357 | $115.21 | $386.76K | 0.8% | 434,702 | Aug 6, 2026 | — | Form 4 |
| McKinnis Aric Brendan CFO | Tax withheld | 274 | $115.21 | $31.57K | 1.9% | 14,152 | Aug 6, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Option exercise | 6,031 | — | — | 1.4% | 438,059 | Aug 6, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Tax withheld | 2,028 | $114.44 | $232.08K | 0.5% | 432,028 | Aug 5, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Option exercise | 3,644 | — | — | 0.8% | 434,056 | Aug 5, 2026 | — | Form 4 |
| McKinnis Aric Brendan CFO | Option exercise | 521 | — | — | 4.0% | 13,457 | Aug 5, 2026 | — | Form 4 |
| McKinnis Aric Brendan CFO | Tax withheld | 130 | $114.44 | $14.88K | 1.0% | 13,327 | Aug 5, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 1,041 | $116.56 | $121.34K | 0.2% | 434,106 | Jul 15, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 868 | $121.30 | $105.29K | 0.2% | 430,412 | Jul 15, 2026 | — | Form 4 |
| SLESSOR MIKE CEO | Sell | 300 | $120.58 | $36.17K | 0.1% | 431,280 | Jul 15, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.