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Formfactor Inc

FORM
Exchange
Nasdaq
Industry
Semiconductors & Related Devices
SEC CIK
0001039399

In the last 90 days, Formfactor Inc insiders filed 0 open-market purchases and 4 sales; 510 institutions reported holding it in 13F filings for Q2 2026, worth $11.4B in total; Maverick Capital is the only superinvestor holding it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Formfactor Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
4 filings
2 insiders, $4.69M in total
Insiders trading
2
Net value
−$4.69M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Formfactor Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Formfactor Inc
NameTitleLast reported holdingLast filingFilings, past year
Slessor MikeCEO466,694Sep 17, 202621
Steven-Waiss KelleyDirector24,426Sep 4, 20265
McKinnis Aric BrendanCFO, SVP Global Finance14,152Aug 10, 202610
St Dennis ThomasDirector28,333Jun 16, 20265
Rhodes SheriDirector5,375Jun 4, 20263
Obregon-Jimenez RebecaDirector7,875May 22, 20263
White Brian CDirector8,653May 21, 20264
Titinger JorgeDirector14,836May 19, 20263
Brewer Kevin JDirector8,105Feb 12, 20261
Shahar ShaiCFO, SVP Global Finance55,968Aug 8, 20250
Maier LotharDirector6,770May 15, 20240
Link Raymond ADirector66,225May 30, 20230

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Nov 8, 2021 (view filing)Nov 53 daysSlessor MikeCEOSSale−25.0K$44.60−$1.11M−6.0%392.9K after
Nov 10, 2021 (view filing)Nov 91 dayShahar ShaiCFO, SVP Global FinanceSSale−3.37K$43.78−$147.7K−7.9%39.5K after
Nov 26, 2021 (view filing)Nov 242 daysSteven-Waiss KelleyDirectorSSale−3.00K$43.12−$129.4K−12.0%22.0K after
Feb 9, 2022 (view filing)Feb 81 daySt Dennis ThomasDirectorSSale−6.00K$41.63−$249.8K−13.0%40.1K after
Feb 9, 2022 (view filing)Feb 81 dayObregon-Jimenez RebecaDirectorSSale−2.40K$41.61−$99.9K−33.8%4.70K after
Feb 14, 2022 (view filing)Feb 95 daysSteven-Waiss KelleyDirectorSSale−6.00K$42.62−$255.7K−21.4%22.0K afterAmended
May 17, 2022 (view filing)May 17Same dayLink Raymond ADirectorSSale−1.60K$40.23−$64.4K−2.5%61.4K after
Feb 15, 2023 (view filing)Feb 132 daysSlessor MikeCEOSSale−10.0K$31.97−$319.7K−2.1%477.4K after
Feb 17, 2023 (view filing)Feb 161 daySt Dennis ThomasDirectorSSale−13.0K$32.31−$420.0K−29.6%30.9K after
Mar 7, 2023 (view filing)Mar 61 dayShahar ShaiCFO, SVP Global FinanceSSale−4.76K$29.68−$141.2K−6.1%72.9K after
Nov 13, 2023 (view filing)Nov 9-104 daysShahar ShaiCFO, SVP Global FinanceSSale−24.4K$36.40−$886.7K−20.5%94.6K after5 lots
Nov 15, 2023 (view filing)Nov 141 daySt Dennis ThomasDirectorSSale−3.79K$38.24−$145.0K−8.9%38.7K after
Nov 21, 2023 (view filing)Nov 201 dayShahar ShaiCFO, SVP Global FinanceSSale−16.6K$39.49−$656.2K−17.6%77.9K after
Dec 5, 2023 (view filing)Dec 14 daysObregon-Jimenez RebecaDirectorSSale−8.49K$37.51−$318.5K−42.3%11.6K after
Feb 13, 2024 (view filing)Feb 121 dayShahar ShaiCFO, SVP Global FinanceSSale−10.0K$42.12−$421.2K−13.0%67.1K after
Mar 4, 2024 (view filing)Mar 13 daysSlessor MikeCEOSSale−4.00K$43.38−$173.5K−0.8%499.8K after10b5-1
Mar 5, 2024 (view filing)Mar 41 dayShahar ShaiCFO, SVP Global FinanceSSale−10.0K$44.51−$445.1K−26.6%27.6K after
Apr 2, 2024 (view filing)Apr 11 daySlessor MikeCEOSSale−4.00K$45.94−$183.8K−0.8%495.8K after10b5-1
May 2, 2024 (view filing)May 11 daySlessor MikeCEOSSale−4.00K$43.75−$175.0K−0.8%491.8K after10b5-1
May 8, 2024 (view filing)May 62 daysSteven-Waiss KelleyDirectorSSale−4.80K$54.24−$260.4K−12.8%32.6K after
May 8, 2024 (view filing)May 71 dayRhodes SheriDirectorSSale−13.3K$56.02−$746.1K−63.6%7.63K after
May 8, 2024 (view filing)May 6-72 daysShahar ShaiCFO, SVP Global FinanceSSale−11.9K$55.10−$656.9K−43.2%15.7K after3 lots
May 13, 2024 (view filing)May 103 daysSt Dennis ThomasDirectorSSale−2.00K$56.30−$112.6K−5.2%36.7K after
May 15, 2024 (view filing)May 141 dayMaier LotharDirectorSSale−99.7K$55.08−$5.49M−93.6%6.77K after
May 22, 2024 (view filing)May 202 daysWhite Brian CDirectorSSale−3.29K$57.00−$187.5K−21.8%11.8K after
May 29, 2024 (view filing)May 281 dayObregon-Jimenez RebecaDirectorSSale−4.83K$57.59−$278.3K−31.3%10.6K after
Jun 4, 2024 (view filing)Jun 31 daySlessor MikeCEOSSale−4.00K$54.37−$217.5K−0.8%491.6K after2 lots10b5-1
Jul 2, 2024 (view filing)Jul 11 daySlessor MikeCEOSSale−4.00K$59.00−$236.0K−0.8%487.6K after3 lots10b5-1
Aug 5, 2024 (view filing)Aug 14 daysSlessor MikeCEOSSale−4.00K$50.93−$203.7K−0.8%523.2K after5 lots10b5-1
Aug 7, 2024 (view filing)Aug 61 dayTitinger JorgeDirectorSSale−6.77K$41.94−$283.9K−34.3%13.0K after
Sep 4, 2024 (view filing)Sep 31 daySlessor MikeCEOSSale−4.00K$46.31−$185.2K−0.7%534.3K after2 lots10b5-1
Oct 2, 2024 (view filing)Oct 11 daySlessor MikeCEOSSale−4.00K$45.28−$181.1K−0.7%530.3K after2 lots10b5-1
Nov 4, 2024 (view filing)Nov 13 daysSlessor MikeCEOSSale−4.00K$38.81−$155.2K−0.8%526.3K after10b5-1
Nov 6, 2024 (view filing)Nov 51 daySt Dennis ThomasDirectorSSale−3.10K$39.11−$121.2K−7.6%37.4K after
Dec 2, 2024 (view filing)Dec 2Same daySlessor MikeCEOSSale−4.00K$40.59−$162.3K−0.8%526.5K after2 lots10b5-1
Jan 2, 2025 (view filing)Jan 2Same daySlessor MikeCEOSSale−4.00K$44.44−$177.8K−0.8%522.5K after2 lots10b5-1
Feb 3, 2025 (view filing)Feb 3Same daySlessor MikeCEOSSale−4.00K$38.98−$155.9K−0.8%518.5K after2 lots10b5-1
Mar 4, 2025 (view filing)Mar 31 daySlessor MikeCEOSSale−4.00K$33.05−$132.2K−0.8%518.6K after10b5-1
Mar 6, 2025 (view filing)Mar 51 daySteven-Waiss KelleyDirectorSSale−3.87K$31.02−$120.0K−10.6%32.6K after
Apr 1, 2025 (view filing)Apr 1Same daySlessor MikeCEOSSale−4.00K$28.24−$113.0K−0.8%514.6K after10b5-1
May 1, 2025 (view filing)May 1Same daySlessor MikeCEOSSale−4.00K$31.72−$126.9K−0.8%510.6K after10b5-1
May 30, 2025 (view filing)May 291 daySt Dennis ThomasDirectorSSale−3.00K$31.24−$93.7K−6.8%41.0K after
Jun 3, 2025 (view filing)Jun 21 daySlessor MikeCEOSSale−4.00K$29.83−$119.3K−0.8%510.9K after10b5-1
Jul 2, 2025 (view filing)Jul 11 daySlessor MikeCEOSSale−4.00K$34.03−$136.1K−0.8%506.9K after10b5-1
Aug 13, 2025 (view filing)Aug 13Same dayObregon-Jimenez RebecaDirectorSSale−4.00K$29.55−$118.2K−23.4%13.1K after
Sep 12, 2025 (view filing)Sep 12Same daySteven-Waiss KelleyDirectorSSale−3.60K$30.43−$109.5K−9.2%35.5K after
Nov 17, 2025 (view filing)Nov 17Same daySt Dennis ThomasDirectorSSale−2.00K$49.85−$99.7K−4.9%39.0K after
Nov 19, 2025 (view filing)Nov 19Same daySlessor MikeCEOSSale−8.40K$50.06−$420.7K−1.6%533.3K after2 lots10b5-1
Dec 2, 2025 (view filing)Dec 2Same daySteven-Waiss KelleyDirectorSSale−2.70K$55.97−$151.1K−7.6%32.8K after
Dec 17, 2025 (view filing)Dec 17Same daySlessor MikeCEOSSale−7.67K$56.36−$432.2K−1.4%525.6K after2 lots10b5-1