SEC Form 4 · accession 0001628280-26-057485
FORMFACTOR INC · FORM
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Mike Slessor
Officer — CEO · Director
Period of report
Aug 14, 2026
Accepted (ET)
Aug 17, 2026 · 6:16 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001039399
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1,F2 | Aug 14, 2026 | S | 2,482 | $128.72 | D | 497,724 | D | |
| Common StockF1,F3 | Aug 14, 2026 | S | 2,892 | $129.55 | D | 494,832 | D | |
| Common StockF1,F4 | Aug 14, 2026 | S | 3,282 | $130.54 | D | 491,550 | D | |
| Common StockF1,F5 | Aug 14, 2026 | S | 1,125 | $131.65 | D | 490,425 | D | |
| Common StockF1,F6 | Aug 14, 2026 | S | 5,535 | $132.50 | D | 484,890 | D | |
| Common StockF1,F7 | Aug 14, 2026 | S | 686 | $133.33 | D | 484,204 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.
- F2Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $128.14 through $129.01. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
- F3Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $129.29 through $129.80. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
- F4Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $130.255 through $131.00. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
- F5Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $131.30 through $131.75. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
- F6Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $132.17 through $132.95. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.
- F7Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $133.255 through $133.53. Reporting person undertakes to provide upon request by the SEC staff or a security holder of the Issuer, full information regarding the number of shares sold at each separate price.