Builders FirstSource (NYSE: BLDR) director granted 2,558 restricted stock units

Rhea-AI Filing Summary

Builders FirstSource director Cheryl Ainoa reported receiving a grant of 2,558 shares of common stock in the form of restricted stock units under the company’s 2014 Incentive Plan. These units vest on May 14, 2027, after which each unit converts into one share. Following this award, she beneficially owns 4,629 common shares directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider AINOA CHERYL

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.01 per share	2,558	$0.00	--

Holdings After Transaction: Common Stock, par value $0.01 per share — 4,629 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant size: 2,558 units Grant price per share: $0.00 per share Holdings after grant: 4,629 shares +1 more

4 metrics

RSU grant size 2,558 units Restricted stock units granted on May 14, 2026

Grant price per share $0.00 per share Equity award, no purchase price

Holdings after grant 4,629 shares Total common shares beneficially owned after transaction

Vesting date May 14, 2027 Date RSUs convert to common shares

Key Terms

restricted stock units, 2014 Incentive Plan, beneficially owns

3 terms

restricted stock units financial

"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 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.

2014 Incentive Plan financial

"Reflects the acquisition of restricted stock units pursuant to the Corporation's 2014 Incentive Plan."

beneficially owns financial

"total_shares_following_transaction": "4629.0000""

Beneficially owns means a person or entity enjoys the economic benefits and control of a security even if the legal title or registration is held in another name. Think of it like having the keys and profits from a car that is registered to a friend: you use it, benefit from it, and make decisions about it even though the official paperwork lists someone else. For investors, this matters because it reveals who truly controls shares, affects voting power, potential conflicts of interest, and regulatory disclosure obligations.

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^*

AINOA CHERYL

(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)
05/14/2026

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	05/14/2026		A		2,558(1)	A	$0	4,629	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 on May 14, 2027 and entitle the reporting person to one share of common stock for each restricted stock unit that vests.

	/s/ Minator Azemi, by power of attorney	05/18/2026
	** 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 BLDR director Cheryl Ainoa report?

Director Cheryl Ainoa reported receiving 2,558 restricted stock units of Builders FirstSource common stock. The award was granted under the 2014 Incentive Plan and represents a compensation-related equity grant rather than an open-market purchase or sale.

How many Builders FirstSource (BLDR) shares does Cheryl Ainoa hold after this Form 4?

After the reported grant, Cheryl Ainoa beneficially owns 4,629 shares of Builders FirstSource common stock. This figure includes the 2,558 restricted stock units that were awarded and will settle into shares once they vest in 2027.

What are the vesting terms of Cheryl Ainoa’s BLDR restricted stock units?

The 2,558 restricted stock units granted to Cheryl Ainoa vest on May 14, 2027. At vesting, each restricted stock unit entitles her to receive one share of Builders FirstSource common stock, subject to the plan’s terms and conditions.

Was Cheryl Ainoa’s BLDR Form 4 a market buy or sell?

The Form 4 reflects an acquisition through an equity award, not a market trade. Cheryl Ainoa received 2,558 restricted stock units at no purchase price as part of compensation, so there was no open-market buying or selling involved.

Under which plan were Cheryl Ainoa’s BLDR restricted stock units granted?

The restricted stock units were granted under Builders FirstSource’s 2014 Incentive Plan. This plan allows the company to issue equity-based awards to directors and other participants as part of its long-term compensation program.