FormFactor CEO sells 16K shares under trading plan

FORMFACTOR INC CEO Mike Slessor reported selling 16,002 shares of common stock on August 14, 2026 in six open-market transactions.

Rhea-AI Filing Summary

FORMFACTOR INC CEO Mike Slessor reported selling 16,002 shares of common stock on August 14, 2026 in six open-market transactions. The sales occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025, at weighted-average prices with ranges from $128.14 to $133.53 per share.

Insider Trade Summary 10b5-1

Net Seller: 16,002 shares

Net Sell 6 txns

Insider SLESSOR MIKE

Role CEO

Sold 16,002 shs ($2.10M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,482	$128.72	$319K
Sale	Common Stock F1, F3	2,892	$129.55	$375K
Sale	Common Stock F1, F4	3,282	$130.54	$428K
Sale	Common Stock F1, F5	1,125	$131.65	$148K
Sale	Common Stock F1, F6	5,535	$132.50	$733K
Sale	Common Stock F1, F7	686	$133.33	$91K

Holdings After Transaction: Common Stock — 484,204 shares (Direct)

Footnotes (7)

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 $128.14 through $129.01. 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 $129.29 through $129.80. 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 $130.255 through $131.00. 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.
5. F5. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $131.30 through $131.75. 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.
6. F6. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $132.17 through $132.95. 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.
7. F7. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $133.255 through $133.53. 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: 16,002 shares Number of sale transactions: 6 Shares in largest single sale: 5,535 shares +3 more

6 metrics

Total shares sold 16,002 shares Aggregate common stock sold by CEO Mike Slessor on August 14, 2026

Number of sale transactions 6 Separate open-market sales reported on August 14, 2026

Shares in largest single sale 5,535 shares Largest transaction block sold at a weighted-average price of $132.50 per share

Shares in smallest single sale 686 shares Smallest transaction block sold at a weighted-average price of $133.33 per share

Representative sale price $128.72 per share Weighted-average price for a 2,482-share sale on August 14, 2026

Representative sale price $132.50 per share Weighted-average price for a 5,535-share sale on August 14, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average sale price, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"The reported sale of shares occurred 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 for the transaction reported."

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

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

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

FORM reported that CEO Mike Slessor sold 16,002 shares of common stock on August 14, 2026. The sales were executed in six open-market trades at weighted-average prices between $128.14 and $133.53 per share under a Rule 10b5-1 plan.

How many FORM (FormFactor Inc) shares did Mike Slessor sell and at what prices?

Mike Slessor sold 16,002 shares of FORM common stock in six trades on August 14, 2026. Weighted-average prices per trade ranged from about $128.14–$129.01 up to $133.255–$133.53 per share, as detailed in the filing footnotes.

Were Mike Slessor’s FORM stock sales made under a Rule 10b5-1 trading plan?

Yes. The filing states the reported sales occurred automatically under a Rule 10b5-1 trading plan. That plan was adopted on August 19, 2025, indicating the trades on August 14, 2026 followed a pre-established schedule rather than discretionary timing.

How many separate transactions did FORM CEO Mike Slessor report on August 14, 2026?

Mike Slessor reported six separate open-market sale transactions on August 14, 2026. Individual trades covered between 686 and 5,535 shares each, all in FORM common stock, with each transaction reported at a weighted-average sale price range.

What was the lowest and highest price range for Mike Slessor’s FORM share sales?

The lowest reported weighted-average price range was $128.14–$129.01 per share, and the highest was $133.255–$133.53. Each transaction’s reported per-share price represents a weighted average across multiple sales within the stated range, according to the footnotes.

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

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Available on EDGAR 08/17/2026 - 06:17 PM Accepted by SEC EDGAR 08/17/2026 - 06:16 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)
08/14/2026

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	08/14/2026		S		2,482(1)	D	$128.72(2)	497,724	D
Common Stock	08/14/2026		S		2,892(1)	D	$129.55(3)	494,832	D
Common Stock	08/14/2026		S		3,282(1)	D	$130.54(4)	491,550	D
Common Stock	08/14/2026		S		1,125(1)	D	$131.65(5)	490,425	D
Common Stock	08/14/2026		S		5,535(1)	D	$132.5(6)	484,890	D
Common Stock	08/14/2026		S		686(1)	D	$133.33(7)	484,204	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 $128.14 through $129.01. 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 $129.29 through $129.80. 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 $130.255 through $131.00. 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.

5. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $131.30 through $131.75. 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.

6. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $132.17 through $132.95. 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.

7. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $133.255 through $133.53. 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	08/17/2026
	** 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)