[Form 4] FORMFACTOR INC Insider Trading Activity

FORMFACTOR INC CEO Mike Slessor reported routine equity compensation activity involving restricted stock units.

Rhea-AI Filing Summary

FORMFACTOR INC CEO Mike Slessor reported routine equity compensation activity involving restricted stock units. On May 7, 2026, 5,908 Restricted Stock Units converted into an equal number of common shares on a 1-for-1 basis. In connection with this vesting, 3,288 common shares were withheld to satisfy tax withholding obligations, rather than sold in the open market. Following these transactions, Slessor directly held 456,475 shares of FORMFACTOR common stock. The RSUs were part of a grant dated August 7, 2023 that vests in twelve quarterly installments through August 7, 2026, and unvested units are forfeited if employment ends, subject to separate change-of-control and severance arrangements.

Insider Trade Summary

5,908 shares exercised/converted

Exercise 3 txns

Insider SLESSOR MIKE

Role CEO

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	5,908	$0.00	$0.00
Exercise	Common Stock	5,908	$0.00	$0.00
Exercise Price or Tax Liability	Common Stock	3,288	$144.68	$476K

Holdings After Transaction: Restricted Stock Units — 5,908 contracts (Direct); Common Stock — 456,475 shares (Direct)

Footnotes (4)

1. 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.
2. F2. Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.
3. F3. The Restricted Stock Units granted on August 7, 2023 vest in twelve (12) quarterly installments beginning on November 7, 2023 and ending on August 7, 2026 and will be settled into shares of common stock on or following the vesting dates.
4. 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.

FAQ

What did FORM (FormFactor Inc) CEO Mike Slessor report in this Form 4?

FORMFACTOR CEO Mike Slessor reported settlement of restricted stock units into common shares and related tax withholding. 5,908 RSUs converted into common stock, and 3,288 shares were withheld to cover tax obligations, leaving him with 459,763 directly held shares after the transactions.

Did the FORMFACTOR (FORM) CEO sell shares on the open market in this filing?

No open-market sale is shown; the disposition is tax-related. The Form 4 records 3,288 common shares withheld upon RSU vesting to cover tax withholding obligations, a non-market transaction, while 5,908 RSUs converted into common stock as part of scheduled equity compensation.

How many FORMFACTOR (FORM) shares does the CEO hold after these transactions?

After the reported RSU settlement and tax withholding, CEO Mike Slessor directly holds 459,763 shares of FORMFACTOR common stock. This total reflects the newly issued shares from vested RSUs minus the portion withheld to satisfy associated tax liabilities on May 7, 2026.

What restricted stock units vested for the FORM (FormFactor) CEO in this Form 4?

5,908 Restricted Stock Units vested and were settled into the same number of FORMFACTOR common shares. Each RSU converts into one share. These units are part of an August 7, 2023 grant that vests quarterly from November 7, 2023 through August 7, 2026.

How does the RSU vesting schedule work for FORM (FORM) CEO Mike Slessor?

The RSUs granted on August 7, 2023 vest in twelve quarterly installments from November 7, 2023 to August 7, 2026. Unvested RSUs are forfeited if his employment ends before a vesting date, subject to separate change-of-control severance and equity-vesting agreements filed with the SEC.

What happens to unvested FORMFACTOR (FORM) RSUs if the CEO leaves the company?

Unvested RSUs are generally forfeited without consideration if employment terminates before a vesting date. However, separate change-of-control severance and equity-vesting agreements, already filed with the SEC, may modify vesting or exercisability terms in specific termination or transaction scenarios.

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Accepted by SEC EDGAR 05/08/2026 - 04:52 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SLESSOR MIKE

(Last) (First) (Middle)

7005 SOUTHFRONT ROAD

(Street)

LIVERMORE CALIFORNIA 94551

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
FORMFACTOR INC [ FORM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/07/2026		M		5,908	A	$0(1)	459,763	D
Common Stock	05/07/2026		F		3,288(2)	D	$144.68	456,475	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	$0	05/07/2026		M			5,908	(3)	(4)	Common Stock	5,908	$0	5,908	D

Explanation of Responses:

1. 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.

2. Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.

3. The Restricted Stock Units granted on August 7, 2023 vest in twelve (12) quarterly installments beginning on November 7, 2023 and ending on August 7, 2026 and will be settled into shares of common stock on or following the vesting dates.

4. 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.

Remarks:

	/s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor	05/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)