FormFactor CEO sells 11,294 shares in plan trade

FORMFACTOR INC CEO Mike Slessor reported open-market sales of company Common Stock in multiple transactions on April 15, 2026, totaling 11,294 shares.

Rhea-AI Filing Summary

FORMFACTOR INC CEO Mike Slessor reported open-market sales of company Common Stock in multiple transactions on April 15, 2026, totaling 11,294 shares. The shares were sold at weighted average prices ranging from about $125.24 to $129.22 per share under a pre-arranged Rule 10b5-1 trading plan adopted on August 19, 2025.

After these sales, Slessor continues to hold 449,565 shares of FormFactor Common Stock directly, indicating he retains a substantial equity stake in the company despite the planned disposals.

Insider Trade Summary 10b5-1

Net Seller: 11,294 shares

Net Sell 5 txns

Insider SLESSOR MIKE

Role CEO

Sold 11,294 shs ($1.44M)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,826	$125.24	$229K
Sale	Common Stock	900	$126.58	$114K
Sale	Common Stock	2,369	$127.65	$302K
Sale	Common Stock	5,432	$128.56	$698K
Sale	Common Stock	767	$129.22	$99K

Holdings After Transaction: Common Stock — 449,565 shares (Direct)

Footnotes (6)

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 $125.01 through $125.735. 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 $126.28 through $126.90. 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 $127.25 through $127.945. 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 $128.05 through $128.87. 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.
6. F6. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $129.00 through $129.62. 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: 11,294 shares Shares held after transactions: 449,565 shares Sale block 1: 1,826 shares at $125.24/share +4 more

7 metrics

Total shares sold 11,294 shares Open-market sales of Common Stock on April 15, 2026

Shares held after transactions 449,565 shares Direct ownership by CEO Mike Slessor after sales

Sale block 1 1,826 shares at $125.24/share Common Stock open-market sale on April 15, 2026

Sale block 2 900 shares at $126.58/share Common Stock open-market sale on April 15, 2026

Sale block 3 2,369 shares at $127.65/share Common Stock open-market sale on April 15, 2026

Sale block 4 5,432 shares at $128.56/share Common Stock open-market sale on April 15, 2026

Sale block 5 767 shares at $129.22/share Common Stock open-market sale on April 15, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average sale price, Common Stock, open-market sale, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025."

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."

Common Stock financial

"security_title: "Common Stock" in each non-derivative transaction entry"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open-market sale financial

"transaction_action: "open-market sale" for each reported transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

non-derivative financial

"transaction_type: "non-derivative" for all reported sales of Common Stock"

FAQ

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

What insider activity did FORM CEO Mike Slessor report in this Form 4 filing for FORM?

FORM CEO Mike Slessor reported selling 11,294 shares of FormFactor Common Stock in open-market transactions. The trades occurred on April 15, 2026 at various weighted average sale prices between approximately $125 and $129 per share under a pre-arranged Rule 10b5-1 plan.

How many FORMFACTOR INC (FORM) shares did the CEO sell and at what prices?

The CEO sold 11,294 FormFactor Common Stock shares across five trades. Reported weighted average prices per share were $125.24, $126.58, $127.65, $128.56, and $129.22, with detailed price ranges for each transaction available to security holders upon request.

How many FORM (FormFactor) shares does CEO Mike Slessor hold after these reported sales?

After the reported sales, CEO Mike Slessor holds 449,565 FormFactor Common Stock shares directly. This post-transaction balance reflects his remaining equity position following the 11,294 shares sold in a series of open-market transactions on April 15, 2026.

Were the FORM CEO’s share sales made under a Rule 10b5-1 trading plan?

Yes. The filing states the reported sale of FormFactor shares occurred automatically under a Rule 10b5-1 trading plan. That plan was adopted on August 19, 2025, indicating the transactions were pre-arranged rather than discretionary trades timed after new information.

What does the weighted average sale price disclosure mean in the FORM Form 4?

Each transaction’s reported price is a weighted average sale price for multiple trades within a range. For example, one sale reflects prices between $125.01 and $125.735. The CEO commits to provide exact share counts at each separate price to the SEC or security holders on request.

Did the FORM Form 4 filing show any derivative exercises or only common stock sales?

The data show only non-derivative FormFactor Common Stock sales totaling 11,294 shares. The derivative position summary is empty, and the transaction summary lists no option exercises, gifts, tax withholdings, or restructuring transactions in this particular Form 4 filing.

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

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Accepted by SEC EDGAR 04/15/2026 - 04:35 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)
04/15/2026

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	04/15/2026		S		1,826(1)	D	$125.24(2)	459,033	D
Common Stock	04/15/2026		S		900(1)	D	$126.58(3)	458,133	D
Common Stock	04/15/2026		S		2,369(1)	D	$127.65(4)	455,764	D
Common Stock	04/15/2026		S		5,432(1)	D	$128.56(5)	450,332	D
Common Stock	04/15/2026		S		767(1)	D	$129.22(6)	449,565	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 $125.01 through $125.735. 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 $126.28 through $126.90. 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 $127.25 through $127.945. 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 $128.05 through $128.87. 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.

6. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $129.00 through $129.62. 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	04/15/2026
	** 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.
* Form 4: SEC 1474 (03-26)