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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 $11.5B 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
Sep 17, 2026 (view filing)7:30 PM ETSep 161 daySlessor MikeCEOSSale−17.5K$104.73−$1.83M−3.6%466.7K after3 lots10b5-1
Sep 4, 2026 (view filing)4:51 PM ETSep 31 daySteven-Waiss KelleyDirectorSSale−2.10K$96.10−$201.8K−7.9%24.4K after
Aug 17, 2026 (view filing)6:16 PM ETAug 143 daysSlessor MikeCEOSSale−16.0K$130.95−$2.10M−3.2%484.2K after6 lots10b5-1
Jul 16, 2026 (view filing)5:30 PM ETJul 151 daySlessor MikeCEOSSale−4.74K$118.31−$560.2K−1.1%430.4K after6 lots10b5-1
Jun 16, 2026 (view filing)Jun 151 daySt Dennis ThomasDirectorSSale−2.80K$151.49−$424.2K−8.8%29.1K after
Jun 11, 2026 (view filing)Jun 101 daySlessor MikeCEOSSale−11.9K$121.35−$1.44M−2.7%435.1K after7 lots10b5-1
Jun 4, 2026 (view filing)Jun 22 daysRhodes SheriDirectorSSale−6.33K$125.40−$793.5K−54.1%5.38K after
May 22, 2026 (view filing)May 211 dayObregon-Jimenez RebecaDirectorSSaleRestricted Stock Units−3.83K$126.48−$484.2K−32.7%7.88K after
May 21, 2026 (view filing)May 201 dayWhite Brian CDirectorSSale−3.25K$126.00−$409.5K−27.3%8.65K after
May 21, 2026 (view filing)May 192 daysSt Dennis ThomasDirectorSSale−1.00K$115.84−$115.8K−3.0%31.9K after
May 15, 2026 (view filing)May 132 daysTitinger JorgeDirectorSSale−4.01K$128.79−$516.3K−22.9%13.5K after
May 15, 2026 (view filing)May 15Same daySteven-Waiss KelleyDirectorSSale−5.40K$125.60−$678.2K−17.7%25.2K after
May 14, 2026 (view filing)May 131 daySlessor MikeCEOSSale−9.44K$126.52−$1.19M−2.1%447.0K after12 lots10b5-1
Apr 15, 2026 (view filing)Apr 15Same daySlessor MikeCEOSSale−11.3K$127.72−$1.44M−2.5%449.6K after5 lots10b5-1
Mar 18, 2026 (view filing)Mar 18Same daySlessor MikeCEOSSale−10.2K$95.15−$973.1K−2.2%460.9K after3 lots10b5-1
Mar 6, 2026 (view filing)Mar 51 dayMcKinnis Aric BrendanCFO, SVP Global FinanceSSale−3.46K$90.42−$313.0K−23.7%11.1K after
Feb 25, 2026 (view filing)Feb 241 dayWhite Brian CDirectorSSale−2.30K$100.01−$230.0K−17.9%10.6K after
Feb 18, 2026 (view filing)Feb 18Same daySlessor MikeCEOSSale−8.66K$94.14−$815.6K−1.8%471.1K after3 lots10b5-1
Feb 12, 2026 (view filing)Feb 111 dayBrewer Kevin JDirectorSSale−3.00K$96.20−$288.6K−27.0%8.11K after
Feb 11, 2026 (view filing)Feb 101 daySt Dennis ThomasDirectorSSale−7.43K$93.84−$697.3K−19.1%31.5K after2 lots
Feb 11, 2026 (view filing)Feb 101 dayRhodes SheriDirectorSSale−7.63K$92.61−$707.0K−42.4%10.4K after
Feb 11, 2026 (view filing)Feb 101 daySteven-Waiss KelleyDirectorSSale−2.20K$93.70−$206.1K−6.7%30.6K after
Feb 10, 2026 (view filing)Feb 91 dayObregon-Jimenez RebecaDirectorSSaleRestricted Stock Units−2.77K$95.82−$265.4K−21.1%10.4K after
Feb 10, 2026 (view filing)Feb 91 dayWhite Brian CDirectorSSale−5.50K$90.95−$500.2K−30.0%12.9K after
Feb 10, 2026 (view filing)Feb 91 dayTitinger JorgeDirectorSSale−2.00K$88.84−$177.7K−10.3%17.5K after
Jan 15, 2026 (view filing)Jan 15Same daySlessor MikeCEOSSale−13.1K$76.81−$1.01M−2.7%472.9K after2 lots10b5-1
Jan 6, 2026 (view filing)Jan 6Same daySlessor MikeCEOSSale−39.6K$65.00−$2.57M−7.5%486.0K after10b5-1
Dec 17, 2025 (view filing)Dec 17Same daySlessor MikeCEOSSale−7.67K$56.36−$432.2K−1.4%525.6K after2 lots10b5-1
Dec 2, 2025 (view filing)Dec 2Same daySteven-Waiss KelleyDirectorSSale−2.70K$55.97−$151.1K−7.6%32.8K after
Nov 19, 2025 (view filing)Nov 19Same daySlessor MikeCEOSSale−8.40K$50.06−$420.7K−1.6%533.3K after2 lots10b5-1
Nov 17, 2025 (view filing)Nov 17Same daySt Dennis ThomasDirectorSSale−2.00K$49.85−$99.7K−4.9%39.0K after
Sep 12, 2025 (view filing)Sep 12Same daySteven-Waiss KelleyDirectorSSale−3.60K$30.43−$109.5K−9.2%35.5K after
Aug 13, 2025 (view filing)Aug 13Same dayObregon-Jimenez RebecaDirectorSSale−4.00K$29.55−$118.2K−23.4%13.1K after
Jul 2, 2025 (view filing)Jul 11 daySlessor MikeCEOSSale−4.00K$34.03−$136.1K−0.8%506.9K after10b5-1
Jun 3, 2025 (view filing)Jun 21 daySlessor MikeCEOSSale−4.00K$29.83−$119.3K−0.8%510.9K after10b5-1
May 30, 2025 (view filing)May 291 daySt Dennis ThomasDirectorSSale−3.00K$31.24−$93.7K−6.8%41.0K after
May 1, 2025 (view filing)May 1Same daySlessor MikeCEOSSale−4.00K$31.72−$126.9K−0.8%510.6K after10b5-1
Apr 1, 2025 (view filing)Apr 1Same daySlessor MikeCEOSSale−4.00K$28.24−$113.0K−0.8%514.6K after10b5-1
Mar 6, 2025 (view filing)Mar 51 daySteven-Waiss KelleyDirectorSSale−3.87K$31.02−$120.0K−10.6%32.6K after
Mar 4, 2025 (view filing)Mar 31 daySlessor MikeCEOSSale−4.00K$33.05−$132.2K−0.8%518.6K after10b5-1
Feb 3, 2025 (view filing)Feb 3Same daySlessor MikeCEOSSale−4.00K$38.98−$155.9K−0.8%518.5K 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
Dec 2, 2024 (view filing)Dec 2Same daySlessor MikeCEOSSale−4.00K$40.59−$162.3K−0.8%526.5K after2 lots10b5-1
Nov 6, 2024 (view filing)Nov 51 daySt Dennis ThomasDirectorSSale−3.10K$39.11−$121.2K−7.6%37.4K after
Nov 4, 2024 (view filing)Nov 13 daysSlessor MikeCEOSSale−4.00K$38.81−$155.2K−0.8%526.3K after10b5-1
Oct 2, 2024 (view filing)Oct 11 daySlessor MikeCEOSSale−4.00K$45.28−$181.1K−0.7%530.3K after2 lots10b5-1
Sep 4, 2024 (view filing)Sep 31 daySlessor MikeCEOSSale−4.00K$46.31−$185.2K−0.7%534.3K after2 lots10b5-1
Aug 7, 2024 (view filing)Aug 61 dayTitinger JorgeDirectorSSale−6.77K$41.94−$283.9K−34.3%13.0K after
Aug 5, 2024 (view filing)Aug 14 daysSlessor MikeCEOSSale−4.00K$50.93−$203.7K−0.8%523.2K after5 lots10b5-1
Jul 2, 2024 (view filing)Jul 11 daySlessor MikeCEOSSale−4.00K$59.00−$236.0K−0.8%487.6K after3 lots10b5-1