FORMFACTOR INC (FORM)
$101.55-$8.68 (-7.87%) Today
FormFactor Inc is a provider of electrical and optical test and measurement technologies along the full semiconductor product lifecycle - from characterization, modeling, reliability, and design de-bug, to qualification and production test.. The company operates in two reportable segments namely Probe Cards Segment and the Systems Segment. Sales of probe cards and analytical probes are included in the Probe Cards Segment, while sales of probe stations and thermal sub-systems are included in the Systems Segment. Probe cards generate the maximum revenue from its operations. It offers multiple product lines which include analytical probes, probe stations, thermal sub-systems, and related services.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 21 | 41,755 | $5.32M |
| Grant or award | 3 | 176,412 | |
| Option exercise | 14 | 319,536 | |
| Tax withholding / forfeiture | 7 | 88,178 | |
| Bona-fide gift | 1 | 740 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
84 Form 4 filings on record, the earliest from Oct 2, 2024, newest first. Filing history page 1 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,482 | $128.72 | $319K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,892 | $129.55 | $375K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 3,282 | $130.54 | $428K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,125 | $131.65 | $148K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 5,535 | $132.50 | $733K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 686 | $133.33 | $91K | |
| Mike Slessor - Officer | Option exercise | Common Stock | 141,792 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 78,908 | $117.39 | $9.26M | |
| Mike Slessor - Officer | Option exercise | Common Stock | 5,908 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 3,288 | $117.39 | $386K | |
| Mike Slessor - Officer | Grant or award | Restricted Stock Units | 27,696 | $0.00 | - | |
| Mike Slessor - Officer | Grant or award | Performance-based Restricted Stock Units | 141,792 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Performance-based Restricted Stock Units | 141,792 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 5,908 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Grant or award | Restricted Stock Units | 6,924 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Common Stock | 3,644 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 2,028 | $114.44 | $232K | |
| Mike Slessor - Officer | Option exercise | Common Stock | 6,031 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 3,357 | $115.21 | $387K | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 3,644 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 6,031 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 521 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 130 | $114.44 | $15K | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 1,099 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 274 | $115.21 | $32K | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 521 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 1,099 | $0.00 | - | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,041 | $116.56 | $121K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,650 | $117.39 | $194K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 706 | $118.21 | $83K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 170 | $119.08 | $20K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 300 | $120.58 | $36K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 868 | $121.30 | $105K | |
| Dennis Thomas St - Director | Open-market sale | Common Stock | 2,800 | $151.49 | $424K | |
| Dennis Thomas St - Director | Gift | Common Stock | 740 | $0.00 | - | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,500 | $122.63 | $307K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,629 | $123.37 | $201K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,399 | $117.70 | $165K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 767 | $119.00 | $91K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 400 | $119.46 | $48K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 975 | $121.00 | $118K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 4,220 | $121.72 | $514K | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 773 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 193 | $125.11 | $24K | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 773 | $0.00 | - | |
| Sheri Rhodes - Director | Open-market sale | Common Stock | 6,328 | $125.40 | $794K | |
| Rebeca Obregon-Jimenez - Director | Open-market sale | Restricted Stock Units | 3,828 | $126.48 | $484K | |
| Brian C. White - Director | Open-market sale | Common Stock | 3,250 | $126.00 | $410K | |
| Dennis Thomas St - Director | Open-market sale | Common Stock | 1,000 | $115.84 | $116K | |
| Dennis Thomas St - Director | Grant or award | Common Stock | 1,347 | $0.00 | - | |
| Rebeca Obregon-Jimenez - Director | Grant or award | Restricted Stock Units | 1,347 | $0.00 | - | |
| Sheri Rhodes - Director | Grant or award | Common Stock | 1,347 | $0.00 | - | |
 Kelley Steven-Waiss - Director | Grant or award | Common Stock | 1,347 | $0.00 | - | |
| Jorge Titinger - Director | Grant or award | Common Stock | 1,347 | $0.00 | - | |
| Brian C. White - Director | Grant or award | Common Stock | 1,347 | $0.00 | - | |
| Jorge Titinger - Director | Open-market sale | Common Stock | 4,009 | $128.79 | $516K | |
| Kelley Steven-Waiss - Director | Open-market sale | Common Stock | 5,400 | $125.60 | $678K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 700 | $122.84 | $86K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,300 | $123.72 | $161K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,984 | $124.71 | $372K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,388 | $125.58 | $174K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 398 | $126.59 | $50K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 100 | $127.47 | $13K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 700 | $128.52 | $90K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 700 | $129.33 | $91K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 200 | $130.57 | $26K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 200 | $132.63 | $27K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 66 | $135.73 | $9K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 702 | $136.15 | $96K | |
| Mike Slessor - Officer | Option exercise | Common Stock | 5,908 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 3,288 | $144.68 | $476K | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 5,908 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Common Stock | 3,644 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 2,028 | $145.00 | $294K | |
| Mike Slessor - Officer | Option exercise | Common Stock | 6,031 | $0.00 | - | |
| Mike Slessor - Officer | Tax withholding / forfeiture | Common Stock | 3,357 | $149.12 | $501K | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 3,644 | $0.00 | - | |
| Mike Slessor - Officer | Option exercise | Restricted Stock Units | 6,031 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 521 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 130 | $145.00 | $19K | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 1,099 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 274 | $149.12 | $41K | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 521 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 1,099 | $0.00 | - | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,826 | $125.24 | $229K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 900 | $126.58 | $114K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,369 | $127.65 | $302K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 5,432 | $128.56 | $698K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 767 | $129.22 | $99K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 1,900 | $94.10 | $179K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 5,495 | $95.21 | $523K | |
| Mike Slessor - Officer | Open-market sale | Common Stock | 2,832 | $95.73 | $271K | |
| Aric Brendan McKinnis - Officer | Open-market sale | Common Stock | 3,462 | $90.42 | $313K | |
| Aric Brendan McKinnis - Officer | Option exercise | Restricted Stock Units | 773 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Option exercise | Common Stock | 773 | $0.00 | - | |
| Aric Brendan McKinnis - Officer | Tax withholding / forfeiture | Common Stock | 193 | $99.70 | $19K | |
| Brian C. White - Director | Open-market sale | Common Stock | 2,300 | $100.01 | $230K |
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| MIKE SLESSOR | Officer, Director | 16,002 | $2.10M | View on EDGAR | |
| - | - | - | - | View on EDGAR | |
| - | - | - | - | View on EDGAR |
FORMFACTOR INC (FORM) had 10 insider filings in the last 90 days, with the most recent on 2026-08-17. The full record for FORM runs to 84 Form 4 filings, the earliest from 2024-10-02. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of FORM were filed in the last 90 days.
21 insider sales of FORM were filed in the last 90 days, totaling $5.32M.
This page tracks FORM Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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