Beta73% was sold under disclosed trading plans, 27% with no plan disclosed. The largest seller, Mike Slessor (CEO, Director), sold $16.2M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 8 officers and directors who sold. 10 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Mike Slessor, Shai Shahar, Thomas St Dennis, Kelley Steven-Waiss, Jorge Titinger, Brian White, Sheri Rhodes, Rebeca Obregon-Jimenez, Aric McKinnis and Kevin Brewer (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Mike Slessor CEO, Director | 11,098 | $125.20 | n/a | n/a | Oct 14, 2026 | Oct 14, 2026 |
"% of total stake" is the shares in an event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings are not confirmed, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
Yes. Mike Slessor sold 170K shares ($16.2M) in the past 12 months, all of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 73% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 27% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Mike Slessor CEO, Director | $16.2M 170K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Sheri Rhodes Director | $1.5M 14K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Thomas St Dennis Director | $1.3M 13K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Kelley Steven-Waiss Director | $1.2M 12K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Brian White Director | $1.1M 11K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Jorge Titinger Director | $694K 6K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Aric McKinnis CFO, SVP Global Finance | $313K 3.5K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Kevin Brewer Director | $289K 3K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 16, 2025 | Sold | Held Oct 16, 2026 | Still held |
|---|---|---|---|---|
Mike Slessor!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Mike Slessor are complete. CEO, Director | n/a | −170K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Mike SlessorHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Mike Slessor are complete; balances and unit counts will be added when the check is finished. −5Kgifted (net of own trusts) −114Kwithheld by the company for taxes | ||||
Shai Shahar!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Shai Shahar are complete. CFO, SVP Global Finance | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Shai ShaharHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Shai Shahar are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Thomas St Dennis!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Thomas St Dennis are complete. Director | n/a | −13K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Thomas St DennisHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Thomas St Dennis are complete; balances and unit counts will be added when the check is finished. −740gifted (net of own trusts) | ||||
Kelley Steven-Waiss!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kelley Steven-Waiss are complete. Director | n/a | −12K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Kelley Steven-WaissHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kelley Steven-Waiss are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Jorge Titinger!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jorge Titinger are complete. Director | n/a | −6K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jorge TitingerHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jorge Titinger are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Brian White!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Brian White are complete. Director | n/a | −11K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Brian WhiteHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Brian White are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Sheri Rhodes!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Sheri Rhodes are complete. Director | n/a | −14K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Sheri RhodesHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sheri Rhodes are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Rebeca Obregon-Jimenez!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Rebeca Obregon-Jimenez are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Rebeca Obregon-JimenezHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Rebeca Obregon-Jimenez are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Aric McKinnis!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Aric McKinnis are complete. CFO, SVP Global Finance | n/a | −3.5K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Aric McKinnisHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Aric McKinnis are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −2Kwithheld by the company for taxes | ||||
Kevin Brewer!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kevin Brewer are complete. Director | n/a | −3K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Kevin BrewerHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kevin Brewer are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Holdings and share of stake for Formfactor Inc are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $22.7M across 232,738 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($6.2M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $1.5M of it is Sheri Rhodes. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Sheri Rhodes, Jun 2, 2026
115,667 shares ($13.0M) were withheld by the company for taxes, which isn't a market sale.
Gifts the filings describe as charitable. Gifts are not sales and are not included in the sale totals.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Mike Slessor CEO, Director | 170K | $16.2M | 100% | 71% | Nov 19, 2025 to Oct 14, 2026 |
| Sheri Rhodes Director | 14K | $1.5M | 0% | 7% | Feb 10, 2026 to Jun 2, 2026 |
| Thomas St Dennis Director | 13K | $1.3M | 0% | 6% | Nov 17, 2025 to Jun 15, 2026 |
| Kelley Steven-Waiss Director | 12K | $1.2M | 0% | 5% | Dec 2, 2025 to Sep 3, 2026 |
| Brian White Director | 11K | $1.1M | 0% | 5% | Feb 9, 2026 to May 20, 2026 |
| Jorge Titinger Director | 6K | $694K | 0% | 3% | Feb 9, 2026 to May 13, 2026 |
| Aric McKinnis CFO, SVP Global Finance | 3.5K | $313K | 100% | 1% | Mar 5, 2026 to Mar 5, 2026 |
| Kevin Brewer Director | 3K | $289K | 0% | 1% | Feb 11, 2026 to Feb 11, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $520K | $421K | $0 | $100K |
| Dec 2025 | $583K | $432K | $0 | $151K |
| Jan 2026 | $3.6M | $3.6M | $0 | $0 |
| Feb 2026 | $3.6M | $816K | $0 | $2.8M |
| Mar 2026 | $1.3M | $1.3M | $0 | $0 |
| Apr 2026 | $1.4M | $1.4M | $0 | $0 |
| May 2026 | $2.9M | $1.2M | $0 | $1.7M |
| Jun 2026 | $2.7M | $1.4M | $0 | $1.2M |
| Jul 2026 | $560K | $560K | $0 | $0 |
| Aug 2026 | $2.1M | $2.1M | $0 | $0 |
| Sep 2026 | $2.0M | $1.8M | $0 | $202K |
| Oct 2026 | $1.4M | $1.4M | $0 | $0 |
More than usual: about 1.9x the 5-year average. 9 insiders sold; the average is 5 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 239K | 9 | $23.4M |
| Oct 16, 2025 1 year earlier | 54K | 4 | $1.8M |
| Oct 16, 2024 2 years earlier | 252K | 9 | $12.4M |
| Oct 17, 2023 3 years earlier | 28K | 3 | $881K |
| Oct 17, 2022 4 years earlier | 47K | 6 | $2.1M |
| Oct 17, 2021 5 years earlier | 240K | 5 | $9.3M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Formfactor Inc are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 892 Forms 3, 4 and 5 on record for Formfactor Inc (SEC CIK 1039399), filed from Jul 28, 2003 to Oct 14, 2026; 56 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 16, 2026. Prices are the ones reported in each filing, often weighted averages.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
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