Trex (TREX) director adds 12,380 shares in open-market stock purchases

Rhea-AI Filing Summary

Trex Company director Andrew B. Rose reported open-market purchases of 12,380 shares of Trex common stock. The transactions occurred on March 2, 2026 and March 3, 2026, at weighted average prices of approximately $40.14, $40.26 and $40.74 per share.

Each reported price reflects a weighted average for multiple trades within narrow ranges. The filing notes that detailed trade-by-trade pricing within the disclosed ranges is available upon request to the company, its security holders, or the SEC staff.

Insider Trade Summary

Net Buyer: 12,380 shares ($503,560)

Net Buy 3 txns

Insider ROSE B ANDREW

Role Director

Bought 12,380 shs ($504K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	986	$40.1409	$40K
Purchase	Common Stock	11,022	$40.737	$449K
Purchase	Common Stock	372	$40.2618	$15K

Holdings After Transaction: Common Stock — 3,161 shares (Direct)

Footnotes (1)

1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.13 to $40.33, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.84 to $40.34, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (2) to this Form 4. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.54 to $40.86, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (3) to this Form 4.

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^*

ROSE B ANDREW

(Last) (First) (Middle)

C/O TREX COMPANY, INC.

2500 TREX WAY

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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	03/02/2026		P		372	A	$40.2618(1)	2,175	D
Common Stock	03/03/2026		P		986	A	$40.1409(2)	3,161	D
Common Stock	03/03/2026		P		11,022	A	$40.737(3)	14,183	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. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.13 to $40.33, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (1) to this Form 4.

2. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $39.84 to $40.34, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (2) to this Form 4.

3. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $40.54 to $40.86, inclusive. The reporting person undertakes to provide to Issuer, any security holder of Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote (3) to this Form 4.

	/s/ Amy M. Fernandez by power of attorney	03/03/2026
	** 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).
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FAQ

What insider transaction did Trex (TREX) report for Andrew B. Rose?

Trex reported that director Andrew B. Rose bought 12,380 shares of Trex common stock in open-market transactions. These purchases occurred on March 2 and March 3, 2026, at weighted average prices slightly above $40 per share, according to the Form 4 filing.

How many Trex (TREX) shares did Andrew B. Rose buy and on which dates?

Andrew B. Rose bought a total of 12,380 Trex common shares. The Form 4 shows one purchase on March 2, 2026, and two separate open-market purchases on March 3, 2026, all classified as non-derivative common stock transactions.

What prices did Andrew B. Rose pay for Trex (TREX) shares in the reported trades?

The reported prices are weighted averages of multiple trades. The Form 4 lists approximate prices of $40.14, $40.26 and $40.74 per Trex share, with underlying trade ranges from about $39.84 to $40.86, as detailed in the filing’s footnotes.

Were the Trex (TREX) insider transactions by Andrew B. Rose open-market purchases?

Yes. The Form 4 describes each transaction as an open-market purchase of Trex common stock. All three trades are coded as “P,” indicating purchases in the open market or private transactions, and are categorized as non-derivative securities.

Does the Trex (TREX) Form 4 provide detailed pricing for each individual trade?

The Form 4 reports weighted average prices and price ranges instead of each individual trade price. It states that Andrew B. Rose will provide full information on the number of shares purchased at each separate price within those ranges upon request.