TREX (TREX) COO Adam Zambanini receives time- and performance-based stock grants

Rhea-AI Filing Summary

Zambanini Adam Dante reported acquisition or exercise transactions in this Form 4 filing.

TREX CO INC executive Adam Dante Zambanini, EVP and Chief Operating Officer, reported two equity awards of common stock on February 24, 2026, classified as grants or awards rather than market purchases. These were structured as restricted stock unit awards.

One award vests over three years in three equal annual installments on March 1, 2027, March 1, 2028, and March 1, 2029. The second is performance-based, with the same three-year vesting schedule, but the actual shares that vest each year will depend on company financial goals and can range from 0% to 200% of the target share amount.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Zambanini Adam Dante

Role EVP, Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	18,914	$41.45	$784K
Grant/Award	Common Stock	18,914	$41.45	$784K

Holdings After Transaction: Common Stock — 222,176 shares (Direct)

Footnotes (1)

1. This restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

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
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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^*

Zambanini Adam Dante

(Last) (First) (Middle)

2500 TREX WAY

C/O TREX COMPANY, INC.

(Street)

WINCHESTER VA 22601

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TREX CO INC [ TREX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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	02/24/2026		A(1)		18,914	A	$41.45	222,176	D
Common Stock	02/24/2026		A(2)		18,914	A	$41.45	241,090	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 restricted stock unit award vests over a three-year period in three equal annual installments occurring March 1, 2027, March 1, 2028 and March 1, 2029.

2. This restricted stock unit award is performance-based, and vests over a three-year period in three equal installments occurring March 1, 2027, March 1, 2028 and March 1, 2029. The number of shares set forth above is the target number of shares. The number of shares that will actually vest each year will be based upon performance against certain financial goals for the Company and will range from 0% to 200% of the target number of shares.

	/s/ Amy M. Fernandez by power of attorney	02/25/2026
	** 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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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transaction did TREX EVP Adam Zambanini report on this Form 4?

Adam Zambanini reported two equity awards of TREX common stock classified as grants or awards. These are restricted stock unit grants rather than open-market purchases, tied to a multi-year vesting schedule and, in one case, company performance goals.

How do Adam Zambanini’s new TREX restricted stock unit awards vest?

The awards vest over three years in three equal annual installments. Vesting dates are March 1, 2027, March 1, 2028, and March 1, 2029, aligning the executive’s equity compensation with a longer-term service and performance period at TREX.

What is performance-based about one of Adam Zambanini’s TREX stock awards?

One restricted stock unit award is performance-based and vests over the same three-year schedule. The shares that vest each year depend on TREX financial goals, ranging from 0% to 200% of the target number of shares in the award.

Does the Form 4 show Adam Zambanini buying or selling TREX shares in the market?

The Form 4 shows grant or award acquisitions, not market buying or selling. Both transactions use code “A” for grant, award, or other acquisition, reflecting equity compensation granted to Adam Zambanini as part of his role at TREX.

What ownership type is reported for Adam Zambanini’s new TREX awards?

The awards are reported as directly owned common stock. The transactions list ownership as “D” for direct, with no indication of indirect entities such as trusts or partnerships, meaning the reported holdings are attributed directly to Adam Zambanini.