Mark A. Alexander - 01 Jun 2026 Form 4 Insider Report for Builders FirstSource, Inc. (BLDR)

Reporting relationship: Director
Issuer ticker: BLDR
Reported as of: 01 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Jun 2026, 16:05:12 UTC
Prior SEC filing: 18 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Minator Azemi, by power of attorney

Key filing fact

Mark A. Alexander filed Form 4 for Builders FirstSource, Inc. (BLDR) on 02 Jun 2026.

Key facts

This page summarizes Mark A. Alexander's Form 4 filing for Builders FirstSource, Inc. (BLDR).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 02 Jun 2026, 16:05.

Change

Previous filing in this sequence was filed on 18 May 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 0001212607 Primary reporting owner

ALEXANDER MARK A

Relationship: Director
Address: C/O BUILDERS FIRSTSOURCE, INC., 6031 CONNECTION DR., STE. 400, IRVING
Signature: /s/ Minator Azemi, by power of attorney
Signature date: 02 Jun 2026

Reported non-derivative transactions

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

BLDR transaction

Common Stock, par value $0.01 per share

Award

Transaction value
Shares: +409
Change %: +0.86%
Price: $76.26^*
Shares after: 47,913
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Reflects acquisition of shares in lieu of cash compensation for services as a director under the Corporation's 2026 Incentive Plan pursuant to the Corporation's Amended and Restated Director Compensation Policy.