FormFactor CEO sells 10,227 shares in plan trade

FORMFACTOR INC CEO Mike Slessor reported open-market sales of 10,227 shares of Common Stock.

Rhea-AI Filing Summary

FORMFACTOR INC CEO Mike Slessor reported open-market sales of 10,227 shares of Common Stock. On March 18, 2026, he sold 1,900 shares at $94.10, 5,495 shares at $95.21, and 2,832 shares at $95.73. A footnote states the sales occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025. Following these transactions, he directly holds 460,859 shares.

Insider Trade Summary 10b5-1

Net Seller: 10,227 shares

Net Sell 3 txns

Insider SLESSOR MIKE

Role CEO

Sold 10,227 shs ($973K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,900	$94.10	$179K
Sale	Common Stock	5,495	$95.21	$523K
Sale	Common Stock	2,832	$95.73	$271K

Holdings After Transaction: Common Stock — 460,859 shares (Direct)

Footnotes (4)

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 $93.63 through $94.48. 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 $94.77 through $95.60. 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.
4. F4. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $95.66 through $95.87. 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.

FAQ

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How many FORM (FormFactor) shares did CEO Mike Slessor sell?

Mike Slessor sold 10,227 shares of FormFactor Common Stock. The Form 4 shows three open-market sales totaling 10,227 shares on March 18, 2026, at prices in the mid-$90 range per share.

At what prices did the FORM CEO’s March 18, 2026 stock sales occur?

The reported sale prices were $94.10, $95.21, and $95.73 per share. Each line item on the Form 4 reflects a separate open-market sale of Common Stock at these respective prices on March 18, 2026.

How many FORM shares does the CEO hold after these reported sales?

After the transactions, Mike Slessor directly holds 460,859 shares. The final line of the non-derivative transaction table lists total shares following the last sale, providing the updated direct ownership position.

Were the FORM CEO’s March 18, 2026 stock sales pre-planned?

Yes, the filing notes the sales occurred under a Rule 10b5-1 plan. A footnote explains the reported sale of shares happened automatically pursuant to a trading plan adopted on August 19, 2025.

What type of transactions did the FORM CEO report on this Form 4?

The CEO reported open-market sales of Common Stock. Each transaction is coded “S” for sale, identified as non-derivative, and described as an open-market or private transaction in the Form 4 data.

Does the FormFactor CEO’s Form 4 include any option exercises or derivatives?

No, the reported activity involves only non-derivative Common Stock sales. The derivative section shows no remaining derivative positions in this filing, and all three transactions relate to direct holdings of Common Stock.

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Accepted by SEC EDGAR 03/18/2026 - 05:56 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).

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 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)
03/18/2026

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	03/18/2026		S		1,900(1)	D	$94.1(2)	469,186	D
Common Stock	03/18/2026		S		5,495(1)	D	$95.21(3)	463,691	D
Common Stock	03/18/2026		S		2,832(1)	D	$95.73(4)	460,859	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 $93.63 through $94.48. 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 $94.77 through $95.60. 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.

4. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $95.66 through $95.87. 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	03/18/2026
	** 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)