FormFactor CEO sells 17,510 shares in plan trade

FORMFACTOR’s CEO reported pre-planned sales totaling 17,510 shares of common stock on September 16, 2026 under a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

FORMFACTOR INC (FORM) reported that CEO and director Mike Slessor sold a total of 17,510 shares of common stock on September 16, 2026 in open-market or private transactions. The sales were made under a Rule 10b5-1 trading plan adopted on August 19, 2025.

The transactions included 8,737 shares at a weighted average price of $104.26 (range $103.65–$104.63), 7,773 shares at a weighted average price of $105.12 (range $104.66–$105.615), and 1,000 shares at $105.80.

Insider Trade Summary 10b5-1

Net Seller: 17,510 shares

Net Sell 3 txns

Insider SLESSOR MIKE

Role CEO

Sold 17,510 shs ($1.83M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	8,737	$104.26	$911K
Sale	Common Stock F1, F3	7,773	$105.12	$817K
Sale	Common Stock F1	1,000	$105.80	$106K

Holdings After Transaction: Common Stock — 466,694 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 $103.65 through $104.63. 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 $104.66 through $105.615. 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

Total shares sold: 17,510 shares Shares sold at $104.26 weighted average: 8,737 shares Shares sold at $105.12 weighted average: 7,773 shares +2 more

5 metrics

Total shares sold 17,510 shares Common stock sales by CEO on September 16, 2026

Shares sold at $104.26 weighted average 8,737 shares Weighted average price $104.26; range $103.65–$104.63

Shares sold at $105.12 weighted average 7,773 shares Weighted average price $105.12; range $104.66–$105.615

Shares sold at fixed price 1,000 shares at $105.80 Common stock sold by CEO on September 16, 2026

Rule 10b5-1 plan adoption date August 19, 2025 Plan under which the reported sales occurred automatically

Key Terms

Rule 10b5-1 trading plan, weighted average sale price, Form 4

3 terms

Rule 10b5-1 trading plan regulatory

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

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 for the transaction"

Form 4 regulatory

"reported in a Form 4 filing for insider transactions"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

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

What insider transaction did FORMFACTOR (FORM) report for its CEO?

FORMFACTOR reported that CEO and director Mike Slessor sold a total of 17,510 shares of common stock on September 16, 2026 in open-market or private transactions, as disclosed in a Form 4 filing.

At what prices did the FORM CEO sell shares in this Form 4 filing?

The CEO’s reported sales included 8,737 shares at a weighted average price of $104.26, 7,773 shares at a weighted average price of $105.12, and 1,000 shares at $105.80, with detailed price ranges provided for the weighted-average transactions.

How many FORM shares did the CEO sell in total on September 16, 2026?

On September 16, 2026, the CEO sold a total of 17,510 shares of FORMFACTOR common stock, as summarized in the Form 4’s transaction data.

Was the FORM CEO’s stock sale made under a Rule 10b5-1 plan?

Yes. The filing states that the reported sales occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025, and the Form 4’s Rule 10b5-1 checkbox is marked as affirmed.

What price ranges applied to the weighted-average FORM share sales?

For 8,737 shares, the weighted-average sale price of $104.26 reflects a range of $103.65–$104.63. For 7,773 shares, the weighted-average price of $105.12 reflects a range of $104.66–$105.615, according to the Form 4 footnotes.

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

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Available on EDGAR 09/17/2026 - 07:31 PM Accepted by SEC EDGAR 09/17/2026 - 07:30 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)
09/16/2026

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	09/16/2026		S		8,737(1)	D	$104.26(2)	475,467	D
Common Stock	09/16/2026		S		7,773(1)	D	$105.12(3)	467,694	D
Common Stock	09/16/2026		S		1,000(1)	D	$105.8	466,694	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 $103.65 through $104.63. 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 $104.66 through $105.615. 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	09/17/2026
	** 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)