Mike Slessor - 05 Aug 2026 Form 4 Insider Report for FORMFACTOR INC (FORM)

Reporting relationship: CEO, Director
Issuer ticker: FORM
Reported as of: 05 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 07 Aug 2026, 17:56:24 UTC
Prior SEC filing: 16 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor

Key filing fact

Mike Slessor filed Form 4 for FORMFACTOR INC (FORM) on 07 Aug 2026.

Key facts

This page summarizes Mike Slessor's Form 4 filing for FORMFACTOR INC (FORM).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 07 Aug 2026, 17:56.

Change

Previous filing in this sequence was filed on 16 Jul 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001590177 Primary reporting owner

SLESSOR MIKE

Relationship: CEO, Director
Address: 7005 SOUTHFRONT ROAD, LIVERMORE
Signature: /s/ Stan Finkelstein, Attorney-in-fact for Mike Slessor
Signature date: 07 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

FORM transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,644
Change %: +0.85%
Price: $0.000000^*
Shares after: 434,056
Date: 05 Aug 2026
Ownership: Direct
Footnotes: F1

FORM transaction

Common Stock

Tax liability

Transaction value
Shares: -2,028
Change %: -0.47%
Price: $114.44^*
Shares after: 432,028
Date: 05 Aug 2026
Ownership: Direct
Footnotes: F2

FORM transaction

Common Stock

Options Exercise

Transaction value
Shares: +6,031
Change %: +1.4%
Price: $0.000000^*
Shares after: 438,059
Date: 06 Aug 2026
Ownership: Direct
Footnotes: F1

FORM transaction

Common Stock

Tax liability

Transaction value
Shares: -3,357
Change %: -0.77%
Price: $115.21^*
Shares after: 434,702
Date: 06 Aug 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

FORM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -3,644
Change %: -20%
Price: $0.000000^*
Shares after: 14,576
Date: 05 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,644
Exercise price: $0.000000
Footnotes: F3, F4

FORM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -6,031
Change %: -11%
Price: $0.000000^*
Shares after: 48,248
Date: 06 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 6,031
Exercise price: $0.000000
Footnotes: F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

These shares of common stock reflect the settlement of restricted stock units of the Issuer. Each Restricted Stock Unit (RSU) is convertible into a share of common stock on a 1-for-1 basis.

Footnote F2

Represents the number of shares withheld upon vesting of restricted stock units to cover tax withholding obligations.

Footnote F3

The Restricted Stock Units granted on August 5, 2024 vest in twelve (12) quarterly installments beginning on November 5, 2024 and ending on August 5, 2027 and will be settled into shares of common stock on or following the vesting dates.

Footnote F4

If the reporting person's employment is terminated for any reason before an applicable Vesting Date, all restricted stock units that have not yet vested shall be forfeited without consideration, except as provided in the change of control severance agreement and any other agreements regarding equity vesting and exercisability between the reporting person and Issuer, which agreements or form agreements are filed with the SEC.

Footnote F5

The Restricted Stock Units granted on August 6, 2025 vest in twelve (12) quarterly installments beginning on November 6, 2025 and ending on August 6, 2028 and will be settled into shares of common stock on or following the vesting dates.