Builders FirstSource (BLDR) director sells 5,000 company shares

Rhea-AI Filing Summary

Builders FirstSource director David E. Rush reported an open-market sale of 5,000 shares of Common Stock on May 8, 2026 at a weighted average price of $78.17 per share.

The sale was executed in multiple trades between $78.14 and $78.25 per share. After this transaction, Rush continues to hold 122,284 shares of Builders FirstSource Common Stock directly.

Insider Trade Summary

Net Seller: 5,000 shares ($390,850)

Net Sell 1 txn

Insider Rush David E

Role null

Sold 5,000 shs ($391K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $0.01 per share	5,000	$78.17	$391K

Holdings After Transaction: Common Stock, par value $0.01 per share — 122,284 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 5,000 shares Weighted average sale price: $78.17 per share Post-transaction holdings: 122,284 shares +1 more

4 metrics

Shares sold 5,000 shares Open-market sale on May 8, 2026

Weighted average sale price $78.17 per share Common Stock, open-market sale

Post-transaction holdings 122,284 shares Shares held directly after sale

Trade price range $78.14–$78.25 per share Multiple trades comprising the reported sale

Key Terms

open-market sale, weighted average sale price, Common Stock, par value $0.01 per share, Form 4

4 terms

open-market sale financial

"reported an open-market sale of 5,000 shares of Common Stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average sale price financial

"at a weighted average sale price of $78.17 per share"

Common Stock, par value $0.01 per share financial

"Common Stock, par value $0.01 per share"

Form 4 regulatory

"was disclosed in a Form 4 filing"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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^*

Rush David E

(Last) (First) (Middle)

C/O BUILDERS FIRSTSOURCE, INC.

6031 CONNECTION DR., STE. 400

(Street)

IRVING TEXAS 75039

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/08/2026		S		5,000	D	$78.17(1)	122,284	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. This transaction was executed in multiple trades at prices ranging from $78.14 to $78.25 per share. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request by the SEC staff, the issuer, or a security holder of the issuer.

	/s/ Minator Azemi, by power of attorney	05/12/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Builders FirstSource (BLDR) report for David E. Rush?

Builders FirstSource director David E. Rush reported selling 5,000 shares of Common Stock in an open-market transaction. The sale occurred on May 8, 2026 and was disclosed in a Form 4 filing.

At what price did David E. Rush sell Builders FirstSource (BLDR) shares?

David E. Rush sold the 5,000 Builders FirstSource shares at a weighted average price of $78.17 per share. Individual trades occurred in a range between $78.14 and $78.25 per share.

How many Builders FirstSource (BLDR) shares does David E. Rush hold after the sale?

After the reported sale, David E. Rush holds 122,284 shares of Builders FirstSource Common Stock directly. This post-transaction holding reflects his remaining stake following the 5,000-share open-market sale.

Was the Builders FirstSource (BLDR) insider sale executed in a single trade?

No. The 5,000-share sale by David E. Rush was executed in multiple trades. According to the disclosure, prices ranged from $78.14 to $78.25 per share, with $78.17 reported as the weighted average price.

What type of security did David E. Rush sell in Builders FirstSource (BLDR)?

David E. Rush sold Common Stock of Builders FirstSource, with a par value of $0.01 per share. The transaction was reported as a non-derivative open-market sale in the Form 4 filing.