Mike Slessor is CEO at FORMFACTOR INC (FORM). They have made 33 open-market trades across 1 company since 2013, most recently 2026-10-14.
CIK 0001590177
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 33 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| FORM | 455,596 | $47.8M |
| BHE | 4,349 | $307K |
| Total | $48.1M |
Shares reported on the most recent Form 4, priced at the 2026-10-14 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| FORM | SELL · 10b5-1 | 2026-10-14 | 2026-10-14 | $125.20 | $1.4M | — | — | — |
| FORM | SELL · 10b5-1 | 2026-09-16 | 2026-09-17 | $104.73 | $1.8M | +19.4% | — | — |
| FORM | SELL · 10b5-1 | 2026-08-14 | 2026-08-17 | $130.95 | $2.1M | -13.8% | -18.2% | — |
| FORM | SELL · 10b5-1 | 2026-07-15 | 2026-07-16 | $118.31 | $560K | -12.1% | +37.7% | +19.0% |
| FORM | SELL · 10b5-1 | 2026-06-10 | 2026-06-11 | $121.35 | $1.4M | +6.6% | -16.9% | -13.8% |
| FORM | SELL · 10b5-1 | 2026-05-13 | 2026-05-14 | $126.52 | $1.2M | +10.2% | +26.3% | +6.6% |
| FORM | SELL · 10b5-1 | 2026-04-15 | 2026-04-15 | $127.72 | $1.4M | +12.6% | -1.2% | -9.0% |
| FORM | SELL · 10b5-1 | 2026-03-18 | 2026-03-18 | $95.15 | $973K | -1.0% | +48.6% | +51.9% |
| FORM | SELL | 2026-02-18 | 2026-02-18 | $94.14 | $816K | +7.6% | -0.4% | +26.4% |
| FORM | SELL · 10b5-1 | 2026-01-15 | 2026-01-15 | $76.81 | $1.0M | -5.2% | +24.6% | +69.3% |
| FORM | SELL · 10b5-1 | 2026-01-06 | 2026-01-06 | $65.00 | $2.6M | +24.6% | +33.5% | +66.3% |
| FORM | SELL · 10b5-1 | 2025-12-17 | 2025-12-17 | $56.36 | $864K | +2.2% | +40.1% | +69.5% |
| FORM | SELL · 10b5-1 | 2025-11-19 | 2025-11-19 | $50.06 | $841K | +10.1% | +11.9% | +87.4% |
| FORM | SELL · 10b5-1 | 2025-07-01 | 2025-07-02 | $34.03 | $136K | -4.0% | -20.5% | +0.0% |
| FORM | SELL · 10b5-1 | 2025-06-02 | 2025-06-03 | $29.83 | $119K | +6.9% | +15.0% | -9.6% |
| FORM | SELL · 10b5-1 | 2025-05-01 | 2025-05-01 | $31.72 | $127K | +8.7% | +0.7% | +15.5% |
| FORM | SELL · 10b5-1 | 2025-04-01 | 2025-04-01 | $28.24 | $113K | -4.0% | +4.0% | +23.5% |
| FORM | SELL · 10b5-1 | 2025-03-03 | 2025-03-04 | $33.05 | $132K | +0.3% | -20.8% | -5.9% |
| FORM | SELL · 10b5-1 | 2025-02-03 | 2025-02-03 | $38.98 | $156K | -6.3% | -17.4% | -23.9% |
| FORM | SELL · 10b5-1 | 2025-01-02 | 2025-01-02 | $44.44 | $178K | -3.1% | -11.2% | -35.6% |
| FORM | SELL · 10b5-1 | 2024-12-02 | 2024-12-02 | $40.58 | $321K | +2.1% | +5.5% | -24.9% |
| FORM | SELL · 10b5-1 | 2024-11-01 | 2024-11-04 | $38.81 | $155K | +2.3% | +9.4% | +2.1% |
| FORM | SELL · 10b5-1 | 2024-10-01 | 2024-10-02 | $45.28 | $181K | +10.0% | -12.5% | -0.6% |
| FORM | SELL · 10b5-1 | 2024-09-03 | 2024-09-04 | $46.31 | $370K | -3.3% | +6.1% | -2.7% |
| FORM | SELL · 10b5-1 | 2024-08-01 | 2024-08-05 | $50.91 | $383K | +19.1% | +7.8% | -6.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.