[Form 4] Trex Company, Inc. Insider Trading Activity

Rhea-AI Filing Summary

TREX (Form 4): Sr. Vice President, Chief Legal Officer and Secretary Amy M. Fernandez reported two non-derivative transactions dated 08/06/2025.

• Gift (Code G): 78 common shares were donated to a 501(c)(3) charity at $0; post-gift direct ownership stood at 24,491 shares.
• Open-market sale (Code S): 1,538 common shares sold at a volume-weighted average price of $64.1817 (range $64.17-$64.19). Direct ownership after sale declined to 22,953 shares.

No derivative securities were involved. The filing clarifies that a Form 4 submitted on 08/07/2025 was mistakenly labeled an amendment; this document re-files the same transactions as the original Form 4.

The combined disposition represents roughly 6.6% of the insider’s pre-transaction holdings and is immaterial relative to Trex’s outstanding share count, but investors often view officer sales as a modest negative sentiment signal.

Positive

• None.

Negative

• Officer share sale: The CLO sold 1,538 shares (~US$99k), reducing her position by 6.6%, a minor but directionally negative insider signal.

Insights

Equity Analyst

TL;DR: Small insider sale (1,538 sh.) by TREX CLO; modest negative signal, limited magnitude.

The transaction lowers Fernandez’s stake from 24.5k to 23.0k shares, a reduction of roughly 6.6%. While insider gifts are neutral, open-market sales by C-suite members can be interpreted as reduced confidence, albeit the dollar value (≈$99k) is insignificant against Trex’s ~US$7 bn market cap. No pattern of serial selling is indicated and no derivatives were exercised, suggesting liquidity or diversification rather than an adverse outlook. Overall market impact is likely minimal but directionally negative.

Corporate Governance Specialist

TL;DR: Administrative re-filing corrects form type; governance risk unchanged.

The filing primarily rectifies a clerical error—switching a mislabeled amendment to an original Form 4—demonstrating compliance consciousness. The sale volume is small and does not trigger control concerns. Continued direct ownership of nearly 23k shares maintains alignment incentives. No 10b5-1 plan was cited for the sale, so it is discretionary, but scale suggests negligible governance impact.

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^*

Fernandez Amy M.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, CLO and Secretary

3. Date of Earliest Transaction (Month/Day/Year)
08/06/2025

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	08/06/2025(1)		G(2)		78	D	$0	24,491	D
Common Stock	08/06/2025		S		1,538	D	$64.1817(3)	22,953	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. On August 7, 2025, the reporting person inadvertently filed a Form 4, reporting the same transactions set forth in this report, as an amendment to a prior Form 4, as opposed to an original Form 4. This Form 4 is being filed reporting the same transactions, solely to indicate that it is an original Form 4 and not an amendment.

2. This transaction involved a gift by the reporting person to a charitable organization as described in Section 501(c)(3) of the Internal Revenue Code.

3. The price reported in column 4 is a weighted average price These shares were sold in multiple transactions at prices ranging from $64.17 to $64.19, inclusive.

	/s/ Amy M. Fernandez	08/07/2025
	** 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.

FAQ

How many Trex (TREX) shares did Amy M. Fernandez sell?

She sold 1,538 common shares on 08/06/2025 at an average price of $64.1817.

What was the size of the charitable gift disclosed in the Form 4?

The insider gifted 78 shares to a 501(c)(3) organization at no cost.

What is Fernandez’s Trex share ownership after the transactions?

Her direct beneficial ownership is 22,953 common shares following the reported sale.

Did the filing involve any derivative securities or option exercises?

No. Table II shows no derivative security transactions for the period.

Why was a new Form 4 filed on 08/07/2025?

The insider previously filed the same data as an amendment in error; this document corrects it to an original Form 4.