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  4. [Form 4] Builders FirstSource, Inc. Insider Trading Activity

Builders FirstSource (BLDR) officer awarded RSUs, shares withheld to cover taxes

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Builders FirstSource Principal Accounting Officer Matthew Trester reported equity compensation awards and related tax withholding in company stock. He acquired 1,419 and 698 shares of common stock as restricted stock units under the 2014 Incentive Plan, both at a stated price of $0.00 per share.

The new restricted stock units vest in 33.3% increments on each of March 15, 2027, 2028, and 2029, with each vested unit converting into one share of common stock. In a separate transaction, 648 shares at $88.09 per share were withheld to cover tax obligations tied to vesting of previously granted performance-based and time-based restricted stock units.

After these compensation-related transactions and tax withholding, Trester directly owns 4,629 shares of Builders FirstSource common stock. The activity reflects routine stock-based compensation rather than open-market buying or selling.

Positive

  • None.

Negative

  • None.
Insider Trester Matthew
Role Principal Accounting Officer
Type Security Shares Price Value
Grant/Award Common Stock, par value $0.01 per share 1,419 $0.00 --
Grant/Award Common Stock, par value $0.01 per share 698 $0.00 --
Tax Withholding Common Stock, par value $0.01 per share 648 $88.09 $57K
Holdings After Transaction: Common Stock, par value $0.01 per share — 4,579 shares (Direct)
Footnotes (1)
  1. Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest in 33.3% increments on each of March 15, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests. Reflects the vesting of performance-based restricted stock units granted pursuant to the Corporation's 2014 Incentive Plan. Reflects shares withheld to pay tax withholding requirements on vesting of previously granted performance-based restricted stock units and restricted stock units.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED 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).
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*
Trester Matthew
(Last) (First) (Middle)
C/O BUILDERS FIRSTSOURCE, INC.
6031 CONNECTION DR., STE. 400
(Street)
IRVING TX 75039
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Builders FirstSource, Inc. [ BLDR ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Principal Accounting Officer
3. Date of Earliest Transaction (Month/Day/Year)
03/15/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
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)
Code V Amount (A) or (D) Price
Common Stock, par value $0.01 per share 03/15/2026 A(1) 1,419 A $0.00 4,579 D
Common Stock, par value $0.01 per share 03/15/2026 A(2) 698 A $0.00 5,277 D
Common Stock, par value $0.01 per share 03/15/2026 F(3) 648 D $88.09 4,629 D
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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan. The restricted stock units vest in 33.3% increments on each of March 15, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.
2. Reflects the vesting of performance-based restricted stock units granted pursuant to the Corporation's 2014 Incentive Plan.
3. Reflects shares withheld to pay tax withholding requirements on vesting of previously granted performance-based restricted stock units and restricted stock units.
/s/ Minator Azemi, by power of attorney 03/17/2026
** Signature of Reporting Person Date
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.

Source: View Original Filing on SEC EDGAR

FAQ

What did BLDR executive Matthew Trester report in this Form 4 filing?

Matthew Trester reported routine equity compensation activity. He received new restricted stock unit awards and had shares withheld to cover taxes on previously vested awards, resulting in updated direct ownership of 4,629 Builders FirstSource common shares.

How many Builders FirstSource (BLDR) shares did Matthew Trester acquire?

He acquired 1,419 and 698 shares of common stock through restricted stock unit awards. These awards were granted at a stated price of $0.00 per share as part of Builders FirstSource’s 2014 Incentive Plan for executive compensation.

Why were some BLDR shares disposed of in Matthew Trester’s Form 4?

The 648 shares shown as a disposition were withheld to satisfy tax withholding requirements. They relate to vesting of earlier performance-based and time-based restricted stock units, not to an open-market sale or discretionary reduction of his Builders FirstSource holdings.

When do Matthew Trester’s new Builders FirstSource restricted stock units vest?

The newly granted restricted stock units vest in three equal 33.3% installments. Vesting occurs on March 15 of 2027, 2028, and 2029, and each vested unit entitles Trester to receive one share of Builders FirstSource common stock at that time.

How many BLDR shares does Matthew Trester own after these transactions?

Following the reported awards and tax-withholding disposition, Matthew Trester directly owns 4,629 shares of Builders FirstSource common stock. This figure reflects his updated post-transaction position as disclosed in the Form 4 insider trading report.

Are Matthew Trester’s BLDR transactions open-market buys or sells?

No, the filing shows compensation-related activity. The acquisitions are stock awards under the 2014 Incentive Plan, and the 648-share disposition is tax withholding on vesting of prior awards, not an open-market purchase or sale of Builders FirstSource stock.