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FORMFACTOR (FORM) CEO Mike Slessor sells 11,890 shares under 10b5-1 plan

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

Rhea-AI Filing Summary

FORMFACTOR INC CEO Mike Slessor reported open-market sales of a total of 11,890 shares of Common Stock on June 10, 2026. The sales occurred in multiple trades at prices ranging from about $117.70 to $123.37 per share pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on August 19, 2025.

Positive

  • None.

Negative

  • None.
Insider SLESSOR MIKE
Role CEO
Sold 11,890 shs ($1.44M)
Type Security Shares Price Value
Sale Common Stock 1,399 $117.70 $165K
Sale Common Stock 767 $119.00 $91K
Sale Common Stock 400 $119.46 $48K
Sale Common Stock 975 $121.00 $118K
Sale Common Stock 4,220 $121.72 $514K
Sale Common Stock 2,500 $122.63 $307K
Sale Common Stock 1,629 $123.37 $201K
Holdings After Transaction: Common Stock — 445,638 shares (Direct, null)
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 $117.14 through $117.87. 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. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $121.22 through $122.04. 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 $122.25 through $123. 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 $123.365 through $123.39. 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 11,890 shares Total Common Stock sold on June 10, 2026
Highest reported sale price $123.37 per share One of the open-market sales on June 10, 2026
Lowest reported sale price $117.70 per share One of the open-market sales on June 10, 2026
Number of sale transactions 7 transactions Separate Common Stock sales reported in Form 4
Trading plan adoption date August 19, 2025 Rule 10b5-1 plan governing the reported sales
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.
open-market sale financial
"transaction_action": "open-market sale""
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.
weighted average sale price financial
"Price represents the weighted average sale price for the transaction reported."
non-derivative financial
"transaction_type": "non-derivative""
Form 4 regulatory
"INSIDER FILING DATA (Form 4):"
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.
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Form 4 Insider Transactions: What Each Field Means →
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)
06/10/2026		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 Stock06/10/2026S1,399(1)D$117.7(2)445,638D
Common Stock06/10/2026S767(1)D$119444,871D
Common Stock06/10/2026S400(1)D$119.46444,471D
Common Stock06/10/2026S975(1)D$121443,496D
Common Stock06/10/2026S4,220(1)D$121.72(3)439,276D
Common Stock06/10/2026S2,500(1)D$122.63(4)436,776D
Common Stock06/10/2026S1,629(1)D$123.37(5)435,147D
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 $117.14 through $117.87. 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.
3. Price represents the weighted average sale price for the transaction reported. Price range of shares sold is $121.22 through $122.04. 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 $122.25 through $123. 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 $123.365 through $123.39. 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 Slessor06/11/2026
** 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

FAQ

What did FORMFACTOR INC (FORM) CEO Mike Slessor report in this Form 4?

FORMFACTOR INC CEO Mike Slessor reported selling 11,890 shares of Common Stock in open-market transactions on June 10, 2026. These trades were disclosed as routine insider sales and are detailed with per-share prices in the Form 4 filing.

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

Mike Slessor sold a total of 11,890 FORMFACTOR INC Common Stock shares across seven open-market transactions. Reported weighted-average sale prices for these trades ranged roughly between $117.70 and $123.37 per share on June 10, 2026, according to the Form 4.

Were Mike Slessor’s FORM (FORMFACTOR INC) share sales under a Rule 10b5-1 plan?

Yes. The Form 4 states the reported sale of shares occurred automatically under a Rule 10b5-1 trading plan adopted on August 19, 2025. Such pre-arranged plans schedule trades in advance, reducing the significance of short-term market timing.

What type of transactions did FORMFACTOR INC (FORM) disclose for its CEO?

The filing shows non-derivative open-market sales of Common Stock coded as “S” transactions. Each entry reflects an open-market or private sale, with no derivative exercises, option conversions, gifts, or tax-withholding dispositions reported in this particular Form 4.

Does this FORM (FORMFACTOR INC) Form 4 show any option exercises or derivative activity?

No. The derivative summary in the Form 4 is empty and the transaction codes are all “S” for non-derivative Common Stock sales. This indicates the reported activity involved only direct stock sales, with no option exercises or other derivative transactions.

How many separate trades are reported in Mike Slessor’s FORM (FORMFACTOR INC) Form 4?

The Form 4 lists seven separate Common Stock sale transactions on June 10, 2026. Each line item discloses a specific share amount and a weighted-average sale price, together totaling 11,890 shares sold in open-market transactions under the pre-established trading plan.