FormFactor CEO Mike Slessor sells 11,098 shares

The three reported sales were automatic transactions under a Rule 10b5-1 trading plan adopted August 19, 2025.

Rhea-AI Filing Summary

FormFactor Inc. CEO and director Mike Slessor sold 11,098 shares of common stock in three direct transactions on October 14, 2026: 2,195 shares at a weighted average sale price of $124.23 per share, 7,703 at $125.36, and 1,200 at $125.92. The sales occurred automatically under a Rule 10b5-1 trading plan adopted August 19, 2025.

Insider Trade Summary 10b5-1

Net Seller: 11,098 shares

Net Sell 3 txns

Insider SLESSOR MIKE

Role CEO

Sold 11,098 shs ($1.39M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,195	$124.23	$273K
Sale	Common Stock F1, F3	7,703	$125.36	$966K
Sale	Common Stock F1, F4	1,200	$125.92	$151K

Holdings After Transaction: Common Stock — 455,596 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 $123.87 through $124.86. 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 $124.90 through $125.805. 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 $125.855 through $125.98. 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.

Key Figures

Shares sold across reported transactions: 11,098 shares Shares sold: 2,195 shares Weighted average sale price: $124.23 per share +4 more

7 metrics

Shares sold across reported transactions 11,098 shares October 14, 2026

Shares sold 2,195 shares October 14, 2026 transaction

Weighted average sale price $124.23 per share 2,195-share transaction on October 14, 2026

Shares sold 7,703 shares October 14, 2026 transaction

Weighted average sale price $125.36 per share 7,703-share transaction on October 14, 2026

Shares sold 1,200 shares October 14, 2026 transaction

Weighted average sale price $125.92 per share 1,200-share transaction on October 14, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average sale price, Price range of shares sold

3 terms

Rule 10b5-1 trading plan financial

"automatically pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average sale price financial

"Price represents the weighted average sale price"

Price range of shares sold financial

"Price range of shares sold is $123.87 through $124.86"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did FORM CEO Mike Slessor sell, and at what prices?

Mike Slessor sold 11,098 shares of common stock in three transactions on October 14, 2026. The reported amounts and weighted average sale prices were 2,195 shares at $124.23 per share, 7,703 at $125.36, and 1,200 at $125.92.

What were the reported price ranges for Mike Slessor's FORM sales?

The reported ranges were $123.87 through $124.86 for the 2,195-share sale, $124.90 through $125.805 for the 7,703-share sale, and $125.855 through $125.98 for the 1,200-share sale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/14/2026 - 08:06 PM EDT Accepted by SEC EDGAR 10/14/2026 - 08:06 PM EDT 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)
10/14/2026

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	10/14/2026		S		2,195(1)	D	$124.23(2)	464,499	D
Common Stock	10/14/2026		S		7,703(1)	D	$125.36(3)	456,796	D
Common Stock	10/14/2026		S		1,200(1)	D	$125.92(4)	455,596	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 $123.87 through $124.86. 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 $124.90 through $125.805. 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 $125.855 through $125.98. 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	10/14/2026
	** 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)