FormFactor: Mike Slessor proposes $1.39M share sale

Three earlier sales by Mike Slessor are listed: 17,510 shares on September 16, 2026; 16,002 on August 14, 2026; and 4,735 on July 15, 2026.

Rhea-AI Filing Summary

FormFactor, Inc. (FORM) lists a proposed sale by Mike Slessor of 11,098 common shares, with an aggregate market value of $1,389,437.42 and an approximate sale date of October 14, 2026. The shares are identified as Performance Shares acquired from the issuer on August 1, 2025. Slessor also reported earlier sales of 17,510 shares on September 16, 2026; 16,002 shares on August 14, 2026; and 4,735 shares on July 15, 2026.

Key Figures

Shares listed for proposed sale: 11,098 shares Aggregate market value of proposed sale: $1,389,437.42 Shares sold: 17,510 shares +2 more

5 metrics

Shares listed for proposed sale 11,098 shares Approximate sale date: October 14, 2026

Aggregate market value of proposed sale $1,389,437.42 Proposed sale

Shares sold 17,510 shares September 16, 2026

Shares sold 16,002 shares August 14, 2026

Shares sold 4,735 shares July 15, 2026

Key Terms

Rule 144, Performance Shares

2 terms

Rule 144 regulatory

"paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Performance Shares financial

"Performance Shares"

Performance shares are a type of company stock given to executives or employees that only become theirs if the company meets specific goals, like hitting certain profits or growth targets. They motivate leaders to work toward the company’s success, because their additional shares depend on achieving these results.

FAQ

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

How many FORM shares did Mike Slessor propose to sell?

Mike Slessor listed 11,098 FormFactor common shares for a proposed sale, with an aggregate market value of $1,389,437.42 and an approximate sale date of October 14, 2026.

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

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Available on EDGAR 10/14/2026 - 04:20 PM EDT Accepted by SEC EDGAR 10/14/2026 - 04:20 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001590177
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	FORMFACTOR, INC.
SEC File Number	000-50307
Address of Issuer	7005 SOUTHFRONT ROAD LIVERMORE CALIFORNIA 94551
Phone	9252904000
Name of Person for Whose Account the Securities are To Be Sold	MIKE SLESSOR
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	11098	1389437.42	78120725	10/14/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/01/2025	Performance Shares	ISSUER			11098	08/01/2025	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
MIKE SLESSOR 7005 Southfront Road Livermore CA 94551	Common	09/16/2026	17510	1833790.78
MIKE SLESSOR 7005 Southfront Road Livermore CA 94551	Common	08/14/2026	16002	2095492.30
MIKE SLESSOR 7005 Southfront Road Livermore CA 94551	Common	07/15/2026	4735	560197.38

144: Remarks and Signature

Remarks
Date of Notice	10/14/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/19/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Mike (Michael) David Slessor
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)