Builders FirstSource (BLDR) COO receives stock awards, withholds shares for taxes

Rhea-AI Filing Summary

Builders FirstSource Chief Operating Officer Stephen J. Herron reported equity compensation and related tax withholding in company stock. He received two awards totaling 21,975 shares of common stock on March 15, 2026 with a grant price of $0.00 per share, reflecting restricted stock units under the 2014 Incentive Plan. According to footnotes, one award consists of restricted stock units that vest in 33.3% increments on March 15 of 2027, 2028, and 2029, with each unit converting into one share when vested. On the same date, 5,818 shares were withheld at $88.09 per share to satisfy tax obligations from vesting of previously granted performance-based and time-based restricted stock units. After these transactions, Herron directly owns 111,110 shares of Builders FirstSource common stock, indicating these were routine compensation and tax-related entries rather than open-market trades.

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

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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^*

Herron Stephen J

(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)
	Chief Operating 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)		15,325	A	$0.00	110,278	D
Common Stock, par value $0.01 per share	03/15/2026		A(2)		6,650	A	$0.00	116,928	D
Common Stock, par value $0.01 per share	03/15/2026		F(3)		5,818	D	$88.09	111,110	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.
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FAQ

What insider transactions did BLDR executive Stephen J. Herron report?

Stephen J. Herron reported routine equity compensation and tax withholding transactions. He received two stock awards totaling 21,975 shares at $0.00 per share and had 5,818 shares withheld at $88.09 per share to cover tax obligations from vesting restricted stock units.

How many Builders FirstSource (BLDR) shares does Stephen J. Herron now hold?

After the reported transactions, Stephen J. Herron directly holds 111,110 shares of Builders FirstSource common stock. This figure reflects the impact of new stock awards and shares withheld for taxes tied to vesting performance-based and time-based restricted stock units.

Were Stephen J. Herron’s BLDR transactions open-market buys or sells?

The reported transactions were not open-market buys or sells. They consist of stock granted as compensation at $0.00 per share and 5,818 shares withheld at $88.09 per share to satisfy tax liabilities on vesting restricted stock units.

What are the vesting terms of Stephen J. Herron’s new BLDR restricted stock units?

One award reflects restricted stock units vesting in 33.3% increments on March 15 of 2027, 2028, and 2029. Each vested restricted stock unit entitles Stephen J. Herron to receive one share of Builders FirstSource common stock upon vesting.

Why were 5,818 BLDR shares withheld in Stephen J. Herron’s Form 4 filing?

The 5,818 shares were withheld to pay tax withholding requirements related to the vesting of previously granted performance-based restricted stock units and restricted stock units, as disclosed in the filing’s footnotes, rather than being sold in the open market.