Builders FirstSource (BLDR) executive logs RSU grants and tax-withholding share disposition

Rhea-AI Filing Summary

Builders FirstSource, Inc. executive Scott L. Robins, President - West Division, reported equity compensation and related tax withholding transactions in common stock held indirectly through a trust. On March 15, 2026, the trust acquired 9,507 restricted stock units under the 2014 Incentive Plan, which vest in 33.3% increments on each of March 15, 2027, 2028, and 2029.

On the same date, the trust also acquired 5,594 shares upon vesting of performance-based restricted stock units granted under the same plan. To cover tax withholding obligations on vesting of these and previously granted awards, 5,057 shares were disposed of at $88.09 per share. After these transactions, indirect holdings by the trust totaled 151,247 shares of common stock.

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

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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^*

Robins Scott L

(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)
	President - West Division

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)		9,507	A	$0.00	150,710	I	By trust
Common Stock, par value $0.01 per share	03/15/2026		A(2)		5,594	A	$0.00	156,304	I	By trust
Common Stock, par value $0.01 per share	03/15/2026		F(3)		5,057	D	$88.09	151,247	I	By trust

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.
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FAQ

What insider transactions did BLDR executive Scott L. Robins report?

Scott L. Robins reported equity compensation and related tax withholding. A trust acquired restricted stock units and shares from vesting performance-based awards, and disposed of shares solely to cover tax obligations, reflecting routine compensation activity rather than open-market buying or selling.

How many restricted stock units did Scott L. Robins receive in the latest BLDR Form 4?

A trust associated with Scott L. Robins received 9,507 restricted stock units. These units were granted under Builders FirstSource’s 2014 Incentive Plan and will convert into common shares as they vest over time, subject to the plan’s terms and vesting schedule.

What is the vesting schedule for Scott L. Robins’ new BLDR restricted stock units?

The 9,507 restricted stock units vest in 33.3% increments on March 15, 2027, March 15, 2028, and March 15, 2029. Each vested unit entitles the reporting person to receive one share of Builders FirstSource common stock upon vesting.

Why were some BLDR shares disposed of in Scott L. Robins’ Form 4 filing?

The filing states 5,057 shares were withheld to satisfy tax withholding requirements. These shares relate to the vesting of previously granted performance-based restricted stock units and restricted stock units, and do not represent an open-market sale decision by the executive.

How many BLDR shares does the trust associated with Scott L. Robins hold after these transactions?

Following the reported grant, vesting, and tax-withholding disposition, the trust’s indirect holdings total 151,247 shares of Builders FirstSource common stock. This figure reflects the position after all transactions reported in the Form 4 on March 15, 2026.

Were Scott L. Robins’ BLDR transactions open-market buys or sales?

No open-market buys or sales were reported. The acquisitions were equity grants and vesting of performance-based restricted stock units, while the disposition was a tax-withholding transaction, where shares were withheld to cover tax liabilities on vesting awards.