Builders FirstSource (NYSE: BLDR) CEO granted RSUs and withholds shares for taxes

Rhea-AI Filing Summary

Builders FirstSource President & CEO Peter M. Jackson reported compensation-related stock transactions. He received 42,570 restricted stock units under the 2014 Incentive Plan, which vest in 33.3% increments on each of March 15, 2027, 2028, and 2029, with each unit convertible into one common share when vested.

He also acquired 8,392 shares upon vesting of previously granted performance-based restricted stock units. To cover tax withholding on these vestings, 8,508 shares were disposed of at $88.09 per share through share withholding rather than an open-market sale. After these transactions, he directly owns 272,332 shares of common stock.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Jackson Peter M.

Role President & CEO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	42,570	$0.00	--
Grant/Award	Common Stock, par value $0.01 per share	8,392	$0.00	--
Tax Withholding	Common Stock, par value $0.01 per share	8,508	$88.09	$749K

Holdings After Transaction: Common Stock, par value $0.01 per share — 272,448 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^*

Jackson Peter M.

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

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)		42,570	A	$0.00	272,448	D
Common Stock, par value $0.01 per share	03/15/2026		A(2)		8,392	A	$0.00	280,840	D
Common Stock, par value $0.01 per share	03/15/2026		F(3)		8,508	D	$88.09	272,332	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.

FAQ

What stock awards did BLDR CEO Peter M. Jackson receive in this Form 4?

Peter M. Jackson received 42,570 restricted stock units under Builders FirstSource’s 2014 Incentive Plan. These are compensation awards that convert into common shares as they vest over multiple future years, aligning executive pay with long-term company performance.

How do Peter M. Jackson’s new BLDR restricted stock units vest?

The 42,570 restricted stock units vest in 33.3% increments on each of March 15, 2027, March 15, 2028, and March 15, 2029. Each vested restricted stock unit entitles him to receive one share of Builders FirstSource common stock.

What performance-based shares vested for BLDR CEO Peter M. Jackson?

He acquired 8,392 shares of common stock through the vesting of previously granted performance-based restricted stock units. These awards were granted under Builders FirstSource’s 2014 Incentive Plan and became earned based on prior performance conditions specified at grant.

Why were 8,508 BLDR shares disposed of in this Form 4 filing?

8,508 shares were withheld at $88.09 per share to satisfy tax withholding obligations on vesting restricted stock units. This is a tax-withholding disposition to the company, not an open-market sale, and is a common mechanism for covering income taxes on equity awards.

How many Builders FirstSource shares does the CEO hold after these transactions?

Following the reported grants, vesting, and tax-share withholding, Peter M. Jackson directly owns 272,332 shares of Builders FirstSource common stock. This figure reflects his updated direct ownership after all Form 4 transactions on the reported date.

Are the BLDR CEO’s reported transactions open-market buys or sells?

No open-market trades are shown. The Form 4 reports stock awards and vesting (code A) plus tax withholding through share disposition (code F). The F-code transaction represents shares withheld for taxes, not discretionary buying or selling on the open market.