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FormFactor Inc (FORM) CEO sells 4,735 shares under Rule 10b5-1 plan

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

FORMFACTOR INC CEO and director Mike Slessor reported open-market sales of 4,735 shares of common stock on July 15, 2026, executed in six transactions at weighted-average prices within disclosed ranges between about $115.995 and $121.38 per share.

The sales occurred automatically under a pre-arranged Rule 10b5-1 trading plan adopted on August 19, 2025.

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Insider SLESSOR MIKE
Role CEO
Sold 4,735 shs ($560K)
Type Security Shares Price Value
Sale Common Stock 1,041 $116.56 $121K
Sale Common Stock 1,650 $117.39 $194K
Sale Common Stock 706 $118.21 $83K
Sale Common Stock 170 $119.08 $20K
Sale Common Stock 300 $120.58 $36K
Sale Common Stock 868 $121.30 $105K
Holdings After Transaction: Common Stock — 434,106 shares (Direct)
Footnotes (1)
  1. The reported sale of shares occurred automatically pursuant to a Rule 10b5-1 trading plan adopted on August 19, 2025. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $115.995 through $116.985. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $116.995 through $117.9. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $117.985 through $118.8. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $119.075 through $119.085. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $120.215 through $120.76. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $121.14 through $121.38. 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.
Shares sold 4,735 shares Aggregate common shares sold in open-market transactions on July 15, 2026 by the CEO
Number of sale transactions 6 Count of separate open-market sale entries reported for July 15, 2026
Sale price example $121.3000 per share Weighted-average price for one reported sale of 868 shares of common stock
Shares in largest single sale 1,650 shares Largest individual transaction size reported, at a weighted-average price of $117.3900
Lowest price range bound $115.995 Lower end of a disclosed weighted-average sale price range for the July 15, 2026 trades
Highest price range bound $121.38 Upper end of a disclosed weighted-average sale price range for the July 15, 2026 trades
Rule 10b5-1 plan adoption date August 19, 2025 Date on which the trading plan governing the reported sales was adopted
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 sale market
"Transaction code "S" reflects a Sale in open market or private 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.

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FAQ

What insider stock sale did FORM (FormFactor Inc) disclose for July 15, 2026?
FormFactor Inc reported that CEO Mike Slessor sold 4,735 shares of common stock on July 15, 2026 in six open-market transactions. The trades used weighted-average pricing within disclosed ranges between about $115.995 and $121.38 per share.

At what prices did FormFactor Inc (FORM) CEO Mike Slessor sell shares?
The reported sales by CEO Mike Slessor were executed at weighted-average prices within several disclosed ranges between about $115.995 and $121.38 per share. Each transaction’s price reflects an average of multiple trades in that range.

How many transactions did FORM’s CEO execute in this Form 4 filing?
CEO Mike Slessor executed six open-market sale transactions in FormFactor Inc common stock, all dated July 15, 2026. Together these transactions covered an aggregate of 4,735 shares sold, as summarized in the filing’s transaction table.

Was the FormFactor Inc (FORM) CEO stock sale under a Rule 10b5-1 plan?
Yes. The filing states the reported sales occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025. Such plans pre-arrange trading activity, reducing the significance of trade timing as an informational signal.

What role does Mike Slessor hold at FormFactor Inc (FORM) in this Form 4?
Mike Slessor is identified as both CEO and a director of FormFactor Inc in the Form 4. The reported transactions therefore reflect trading activity by a senior executive and board member in the company’s common stock.
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock07/15/2026S1,041(1)D$116.56(2)434,106D
Common Stock07/15/2026S1,650(1)D$117.39(3)432,456D
Common Stock07/15/2026S706(1)D$118.21(4)431,750D
Common Stock07/15/2026S170(1)D$119.08(5)431,580D
Common Stock07/15/2026S300(1)D$120.58(6)431,280D
Common Stock07/15/2026S868(1)D$121.3(7)430,412D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 $115.995 through $116.985. 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 $116.995 through $117.9. 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 $117.985 through $118.8. 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 $119.075 through $119.085. 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 $120.215 through $120.76. 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 $121.14 through $121.38. 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 Slessor07/16/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR