FORM CEO Mike Slessor reports November 2025 insider stock sale

Rhea-AI Filing Summary

FormFactor, Inc. (FORM) CEO and director Mike Slessor reported open-market sales of company stock. On 11/19/2025, he sold 4,739 shares of common stock at a weighted average price of $49.65, and an additional 3,664 shares at a weighted average price of $50.60. Both transactions are coded as sales and were executed under a Rule 10b5-1 trading plan that was adopted on August 19, 2025. After these transactions, Slessor beneficially owned 533,270 shares of FormFactor common stock in direct ownership.

Insider Trade Summary

Net Seller: 8,403 shares

Net Sell 2 txns

Insider SLESSOR MIKE

Role CEO

Sold 8,403 shs ($421K)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,739	$49.65	$235K
Sale	Common Stock	3,664	$50.60	$185K

Holdings After Transaction: Common Stock — 533,270 shares (Direct)

Footnotes (3)

1. F1. The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.
2. F2. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $49.16 through $50.02. 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. F3. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $50.21 through $50.69. 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.

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 11/19/2025 - 08:54 PM Learn about SEC filing dates

FAQ

What insider transaction did FORM CEO Mike Slessor report?

Mike Slessor, CEO and director of FormFactor, Inc. (FORM), reported selling 4,739 shares of common stock at a weighted average price of $49.65 and 3,664 shares at a weighted average price of $50.60 on 11/19/2025.

How many FORM shares does Mike Slessor own after the reported sales?

Following the reported transactions on 11/19/2025, Mike Slessor beneficially owned 533,270 shares of FormFactor common stock in direct ownership.

Were the FORM stock sales by Mike Slessor under a Rule 10b5-1 plan?

Yes. The filing states that the sales occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025, which pre-arranged the sale of shares.

What were the price ranges for Mike Slessor’s FORM share sales?

For the first sale, the weighted average price was $49.65 with a price range of $49.16 through $50.02. For the second, the weighted average price was $50.60 with a price range of $50.21 through $50.69.

What role does Mike Slessor hold at FormFactor (FORM)?

Mike Slessor is identified in the filing as both a director and an officer of FormFactor, Inc., serving in the role of CEO.

Is this FormFactor (FORM) Form 4 filed by more than one reporting person?

No. The form is indicated as being filed by one reporting person, specifically covering the transactions of Mike Slessor.

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).

X

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 CA 94551

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
11/19/2025

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

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

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

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	11/19/2025		S		4,739(1)	D	$49.65(2)	536,934	D
Common Stock	11/19/2025		S		3,664(1)	D	$50.6(3)	533,270	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

Explanation of Responses:

1. The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025.

2. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $49.16 through $50.02. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $50.21 through $50.69. 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.

Remarks:

	/s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor	11/19/2025
	** 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.