$FORM insider trading
Over the last 12 months, Formfactor insiders reported no purchases and 25 sales totaling $16.9M across SEC Form 4 filings. 44% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- — 0 events
- Sold · 12m
- $16.9M 25 events
- Events · 12m
- 25 Form 4 filings, grouped
- Insiders · 12m
- 9 distinct reporters
- 10b5-1 share
- 44% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Sep 3, 2026 | STEVEN-WAISS KELLEYD | ▼ Sale | 2,100 | $96.1 | $202K | -7.9% | — |
| Aug 14, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 16,002 | $130.95 | $2.1M | -3.2% | plan · 6 tranches |
| Jul 15, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 4,735 | $118.31 | $560K | -1.1% | plan · 6 tranches |
| Jun 15, 2026 | St Dennis ThomasD | ▼ Sale | 2,800 | $151.49 | $424K | -8.8% | — |
| Jun 10, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 11,890 | $121.35 | $1.4M | -2.7% | plan · 7 tranches |
| Jun 2, 2026 | Rhodes SheriD | ▼ Sale | 6,328 | $125.4 | $794K | -54.1% | — |
| Apr 15, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 11,294 | $127.72 | $1.4M | -2.5% | plan · 5 tranches |
| Mar 18, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 10,227 | $95.15 | $973K | -2.2% | plan · 3 tranches |
| Mar 5, 2026 | McKinnis Aric BrendanCFO, SVP Global Finance · O | ▼ Sale | 3,462 | $90.42 | $313K | -23.7% | plan |
| Feb 24, 2026 | WHITE BRIAN CD | ▼ Sale | 2,300 | $100.01 | $230K | -17.9% | — |
| Feb 18, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 8,664 | $94.14 | $816K | -1.8% | plan · 3 tranches |
| Feb 11, 2026 | BREWER KEVIN JD | ▼ Sale | 3,000 | $96.2 | $289K | -27% | — |
| Feb 10, 2026 | St Dennis ThomasD | ▼ Sale | 7,431 | $93.84 | $697K | -19.1% | 2 tranches |
| Feb 10, 2026 | Rhodes SheriD | ▼ Sale | 7,634 | $92.61 | $707K | -42.4% | — |
| Feb 10, 2026 | STEVEN-WAISS KELLEYD | ▼ Sale | 2,200 | $93.7 | $206K | -6.7% | — |
| Feb 9, 2026 | Obregon-Jimenez RebecaD | ▼ Sale | 2,770 | $95.82 | $265K | -21.1% | — |
| Feb 9, 2026 | WHITE BRIAN CD | ▼ Sale | 5,500 | $90.95 | $500K | -30% | — |
| Feb 9, 2026 | Titinger JorgeD | ▼ Sale | 2,000 | $88.84 | $178K | -10.3% | — |
| Jan 15, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 13,088 | $76.81 | $1.0M | -2.7% | plan · 2 tranches |
| Jan 6, 2026 | SLESSOR MIKECEO · O·D | ▼ Sale | 39,606 | $65 | $2.6M | -7.5% | plan |
| Dec 17, 2025 | SLESSOR MIKECEO · O·D | ▼ Sale | 7,669 | $56.36 | $432K | -1.4% | plan · 2 tranches |
| Dec 2, 2025 | STEVEN-WAISS KELLEYD | ▼ Sale | 2,700 | $55.96 | $151K | -7.6% | — |
| Nov 19, 2025 | SLESSOR MIKECEO · O·D | ▼ Sale | 8,403 | $50.06 | $421K | -1.6% | plan · 2 tranches |
| Nov 17, 2025 | St Dennis ThomasD | ▼ Sale | 2,000 | $49.85 | $100K | -4.9% | — |
| Sep 12, 2025 | STEVEN-WAISS KELLEYD | ▼ Sale | 3,600 | $30.42 | $110K | -9.2% | — |
| Aug 13, 2025 | Obregon-Jimenez RebecaD | ▼ Sale | 4,000 | $29.55 | $118K | -23.4% | — |
Every $FORM filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Formfactor filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $FORM feed.