As of the latest Form 4 filed Jun 16, 2026.
What FormFactor Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 55 most recent filings for FORM.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-16 | 2026-06-16 | St Dennis Thomas Director | GGift | −740.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-15 | St Dennis Thomas, Director | SSale | −2.80K | $151.49 | $424K | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE CEO | SSale | −1.63K | $123.37 | $201K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −2.50K | $122.63 | $307K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −4.22K | $121.72 | $514K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −975.00 | $121.00 | $118K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −400.00 | $119.46 | $47.8K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −767.00 | $119.00 | $91.3K | Yes (planned) | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | SLESSOR MIKE, CEO | SSale | −1.40K | $117.70 | $165K | Yes (planned) | Form 4 ↗ |
| 2026-06-04 | 2026-06-02 | McKinnis Aric Brendan CFO, SVP Global Finance | FTax | −193.00 | $125.11 | $24.1K | No | Form 4 ↗ |
| 2026-06-04 | 2026-06-02 | McKinnis Aric Brendan, CFO, SVP Global Finance | MExercise | +773.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-04 | 2026-06-02 | Rhodes Sheri Director | SSale | −6.33K | $125.40 | $794K | No | Form 4 ↗ |
| 2026-05-22 | 2026-05-21 | Obregon-Jimenez Rebeca Director | SSale | −3.83K | $126.48 | $484K | No | Form 4 ↗ |
| 2026-05-21 | 2026-05-20 | WHITE BRIAN C Director | SSale | −3.25K | $126.00 | $410K | No | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | St Dennis Thomas Director | SSale | −1.00K | $115.84 | $116K | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | St Dennis Thomas Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Obregon-Jimenez Rebeca Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Rhodes Sheri Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | STEVEN-WAISS KELLEY Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | Titinger Jorge Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-19 | 2026-05-15 | WHITE BRIAN C Director | AAward | +1.35K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-15 | STEVEN-WAISS KELLEY Director | SSale | −5.40K | $125.60 | $678K | No | Form 4 ↗ |
| 2026-05-15 | 2026-05-13 | Titinger Jorge Director | SSale | −4.01K | $128.79 | $516K | No | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE CEO | SSale | −702.00 | $136.15 | $95.6K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −66.00 | $135.73 | $8.96K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −200.00 | $132.63 | $26.5K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −200.00 | $130.57 | $26.1K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −700.00 | $129.33 | $90.5K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −700.00 | $128.52 | $90.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −100.00 | $127.47 | $12.7K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −398.00 | $126.59 | $50.4K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −1.39K | $125.58 | $174K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −2.98K | $124.71 | $372K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −1.30K | $123.72 | $161K | Yes (planned) | Form 4 ↗ |
| 2026-05-14 | 2026-05-13 | SLESSOR MIKE, CEO | SSale | −700.00 | $122.84 | $86.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-08 | 2026-05-07 | SLESSOR MIKE CEO | FTax | −3.29K | $144.68 | $476K | No | Form 4 ↗ |
| 2026-05-08 | 2026-05-07 | SLESSOR MIKE, CEO | MExercise | +5.91K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | SLESSOR MIKE CEO | FTax | −3.36K | $149.12 | $501K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | SLESSOR MIKE, CEO | MExercise | +6.03K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | McKinnis Aric Brendan CFO, SVP Global Finance | FTax | −274.00 | $149.12 | $40.9K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-06 | McKinnis Aric Brendan, CFO, SVP Global Finance | MExercise | +1.10K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-05 | SLESSOR MIKE CEO | FTax | −2.03K | $145.00 | $294K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-05 | SLESSOR MIKE, CEO | MExercise | +3.64K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-05 | McKinnis Aric Brendan CFO, SVP Global Finance | FTax | −130.00 | $145.00 | $18.9K | No | Form 4 ↗ |
| 2026-05-07 | 2026-05-05 | McKinnis Aric Brendan, CFO, SVP Global Finance | MExercise | +521.00 | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-04-15 | 2026-04-15 | SLESSOR MIKE CEO | SSale | −767.00 | $129.22 | $99.1K | Yes (planned) | Form 4 ↗ |
| 2026-04-15 | 2026-04-15 | SLESSOR MIKE, CEO | SSale | −5.43K | $128.56 | $698K | Yes (planned) | Form 4 ↗ |
| 2026-04-15 | 2026-04-15 | SLESSOR MIKE, CEO | SSale | −2.37K | $127.65 | $302K | Yes (planned) | Form 4 ↗ |
| 2026-04-15 | 2026-04-15 | SLESSOR MIKE, CEO | SSale | −900.00 | $126.58 | $114K | Yes (planned) | Form 4 ↗ |
| 2026-04-15 | 2026-04-15 | SLESSOR MIKE, CEO | SSale | −1.83K | $125.24 | $229K | Yes (planned) | Form 4 ↗ |
| 2026-03-18 | 2026-03-18 | SLESSOR MIKE CEO | SSale | −2.83K | $95.73 | $271K | Yes (planned) | Form 4 ↗ |
| 2026-03-18 | 2026-03-18 | SLESSOR MIKE, CEO | SSale | −5.50K | $95.21 | $523K | Yes (planned) | Form 4 ↗ |
| 2026-03-18 | 2026-03-18 | SLESSOR MIKE, CEO | SSale | −1.90K | $94.10 | $179K | Yes (planned) | Form 4 ↗ |
| 2026-03-06 | 2026-03-05 | McKinnis Aric Brendan CFO, SVP Global Finance | SSale | −3.46K | $90.42 | $313K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-01 | SLESSOR MIKE CEO | SSale | −4.00K | $43.75 | $175K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also FORM’s full analysis or the market-wide insider trading feed. The tabs above jump to FORM’s other SEC data.
Source: SEC Form 4 filings for FORM, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.