Builders FirstSource awards Hiller 12,808 stock units

Each vested unit entitles the COO-Designate to one common share, with vesting scheduled for October 18 in 2027, 2028 and 2029.

Rhea-AI Filing Summary

Builders FirstSource, Inc. (BLDR) COO-Designate Michael Hiller acquired 12,808 restricted stock units on October 18, 2026, under the Corporation’s 2026 Incentive Plan. The units vest in 33.3% increments on October 18 of each year from 2027 through 2029, with each vested unit entitling him to one share of common stock. His reported direct holdings after the award were 64,950 shares.

Insider Trade Summary

Grant/Award: 12,808 shares

Grant/Award 1 txn

Insider Hiller Michael

Role COO-Designate

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share F1	12,808	$0.00	$0.00

Holdings After Transaction: Common Stock, par value $0.01 per share — 64,950 shares (Direct)

Footnotes (1)

1. F1. Reflects the acquisition of restricted stock units pursuant to the Corporation's 2026 Incentive Plan. The restricted stock units vest in 33.3% increments on each of October 18, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

Key Figures

Restricted stock units awarded: 12,808 units Direct holdings after award: 64,950 shares Vesting increment: 33.3% +2 more

5 metrics

Restricted stock units awarded 12,808 units Awarded October 18, 2026

Direct holdings after award 64,950 shares Reported following the award

Vesting increment 33.3% At each stated vesting date

Vesting dates October 18, 2027; October 18, 2028; and October 18, 2029 The restricted stock units vest in increments on these dates

Shares per vested unit 1 share Each restricted stock unit that vests entitles the holder to one common share

Key Terms

restricted stock units, vesting, 2026 Incentive Plan

3 terms

restricted stock units financial

"acquisition of restricted stock units pursuant to the Corporation's 2026 Incentive Plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting financial

"The restricted stock units vest in 33.3% increments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

2026 Incentive Plan financial

"pursuant to the Corporation's 2026 Incentive Plan"

A 2026 incentive plan is a company’s formal program, often named for a year, that authorizes awards like stock options, restricted shares, and cash bonuses to employees and executives to motivate performance and retain talent. For investors it matters because the plan creates potential new shares or payouts that can dilute existing ownership and align management’s choices with company goals—think of it as a reward budget that affects both pay incentives and share value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many restricted stock units did BLDR COO-Designate Michael Hiller receive?

Michael Hiller acquired 12,808 restricted stock units on October 18, 2026, under Builders FirstSource’s 2026 Incentive Plan. His reported direct holdings after the award were 64,950 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/20/2026 - 04:05 PM EDT Accepted by SEC EDGAR 10/20/2026 - 04:05 PM EDT Learn about SEC filing dates

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^*

Hiller Michael

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	COO-Designate

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/18/2026

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	10/18/2026		A(1)		12,808	A	$0.00	64,950	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 2026 Incentive Plan. The restricted stock units vest in 33.3% increments on each of October 18, 2027-2029 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

	/s/ Alena Brenner, by power of attorney	10/20/2026
	** 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)