FormFactor (FORM) CEO Slessor reports 10b5-1 stock sales on Jan. 15 2026

Rhea-AI Filing Summary

FormFactor, Inc. insider filing reports planned stock sales by CEO Mike Slessor. On January 15, 2026, Slessor, who is both CEO and a director, sold 6,976 shares of FormFactor common stock at a weighted average price of $76.43 and an additional 6,112 shares at a weighted average price of $77.24.

The filing states these transactions occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025, which is designed to pre-arrange sales according to preset terms. After these sales, Slessor directly beneficially owned 472,907 shares of FormFactor common stock, as reported in the form.

Insider Trade Summary

Net Seller: 13,088 shares ($1,005,267)

Net Sell 2 txns

Insider SLESSOR MIKE

Role CEO

Sold 13,088 shs ($1.01M)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,976	$76.43	$533K
Sale	Common Stock	6,112	$77.24	$472K

Holdings After Transaction: Common Stock — 479,019 shares (Direct)

Footnotes (1)

1. The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $75.90 through $76.89. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $76.96 through $77.50. 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 →

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)
01/15/2026

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	01/15/2026		S		6,976(1)	D	$76.43(2)	479,019	D
Common Stock	01/15/2026		S		6,112(1)	D	$77.24(3)	472,907	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 $75.90 through $76.89. 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 $76.96 through $77.50. 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	01/15/2026
	** 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.

FAQ

What insider activity did FormFactor (FORM) report for CEO Mike Slessor?

The filing reports that CEO and director Mike Slessor sold 6,976 shares of FormFactor common stock at a weighted average price of $76.43 and 6,112 shares at a weighted average price of $77.24 on January 15, 2026.

How many FormFactor (FORM) shares does Mike Slessor hold after these transactions?

Following the reported sales, Mike Slessor beneficially owned 472,907 shares of FormFactor common stock, held directly.

Were the FormFactor (FORM) insider sales part of a Rule 10b5-1 plan?

Yes. The filing states that the reported sales occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025.

What prices were received for the FormFactor (FORM) shares sold by Mike Slessor?

One sale had a weighted average price of $76.43 with a price range of $75.90–$76.89, and the other had a weighted average price of $77.24 with a price range of $76.96–$77.50.

What is Mike Slessor’s role at FormFactor (FORM)?

Mike Slessor is reported as both a director and an officer of FormFactor, serving as CEO.

Are the FormFactor (FORM) insider trades direct or indirect holdings?

The filing shows the transactions as direct ownership, with no nature of indirect beneficial ownership indicated for the reported shares.