MIKE SLESSOR - 05 Nov 2025 Form 4 Insider Report for FORMFACTOR INC (FORM)

Role: CEO, Director
Signature: /s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor
Issuer symbol: FORM
Transactions as of: 05 Nov 2025
Transactions value $: -$293,795
Form type: 4
Filing time: 07 Nov 2025, 16:22:58 UTC
Previous filing: 04 Nov 2025
Next filing: 10 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SLESSOR MIKE	CEO, Director	7005 SOUTHFRONT ROAD, LIVERMORE	/s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor	07 Nov 2025	0001590177

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FORM	Common Stock	Options Exercise		+3.64K	+0.68%		538K	05 Nov 2025	Direct	F1
transaction	FORM	Common Stock	Tax liability	-$112K	-2.03K	-0.38%	$55.36	536K	05 Nov 2025	Direct	F2
transaction	FORM	Common Stock	Options Exercise		+6.03K	+1.12%		542K	06 Nov 2025	Direct	F1
transaction	FORM	Common Stock	Tax liability	-$182K	-3.35K	-0.62%	$54.22	539K	06 Nov 2025	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	FORM	Restricted Stock Units	Options Exercise	$0	-3.64K	-12.5%	$0.00	25.5K	05 Nov 2025	Common Stock	3.64K	$0.00	Direct	F1, F3, F4
transaction	FORM	Restricted Stock Units	Options Exercise	$0	-6.03K	-8.33%	$0.00	66.3K	06 Nov 2025	Common Stock	6.03K	$0.00	Direct	F1, F4, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These shares of common stock reflect the settlement of restricted stock units of the Issuer. Each Restricted Stock Unit (RSU) is convertible into a share of common stock on a 1-for-1 basis.
F2	Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.
F3	The Restricted Stock Units granted on August 5, 2024 vest in twelve (12) quarterly installments beginning on November 5, 2024 and ending on August 5, 2027 and will be settled into shares of common stock on or following the vesting dates.
F4	If the reporting person's employment is terminated for any reason before an applicable Vesting Date, all restricted stock units that have not yet vested shall be forfeited without consideration, except as provided in the change of control severance agreement and any other agreements regarding equity vesting and exercisability between the reporting person and Issuer, which agreements or form agreements are filed with the SEC.
F5	The Restricted Stock Units granted on August 6, 2025 vest in twelve (12) quarterly installments beginning on November 6, 2025 and ending on August 6, 2028 and will be settled into shares of common stock on or following the vesting dates.