Form 4 for FORM FORMFACTOR INC

Accepted 2026-09-17 19:30:54 ET · period of report 2026-09-16 · accession 0001628280-26-062602 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
MT	2026-09-17 19:30	2026-09-16	FORM	SLESSOR MIKE	CEO, Dir	S - Sale	$104.73	-17.5K	466.7K	-4%	-$1.83M

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-09-16	S	D	8,737	$104.26	475,467	D	—	—	(F1) The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025. (F2) Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $103.65 through $104.63. 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.
2	Common	Common Stock	2026-09-16	S	D	7,773	$105.12	467,694	D	—	—	(F1) The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025. (F3) Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $104.66 through $105.615. 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.
3	Common	Common Stock	2026-09-16	S	D	1,000	$105.80	466,694	D	—	—	(F1) The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.