Insider Transactions Reported by 22 Insiders of TREX CO INC

Symbol: TREX on NYSE
Location: Winchester, VA

Key facts

TREX - TREX CO INC has 22 insiders with reported activity on this page.
Net insider value flow over the last year: +$790,619.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $988,042; sell value: $197,422.
Net share flow: +24,429.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to buying over the last 12 months. Net value: +$790,619.

Buys

$988,042

Shares: 27,505

Insiders: 3

Sells

$197,423

Shares: 3,076

Insiders: 1

Net

+$790,619

Shares: +24,429

Insiders: 2

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	12,380	0	$503,560	$0	+$503,560
3-6	0	0	$0	$0	$0
6-9	15,059	0	$481,432	$0	+$481,432
9-12	66	3,076	$3,051	$197,423	-$194,372

TREX CO INC executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Adam Dante Zambanini	EVP, Chief Operating Officer	$9,713,569			Mixed	01 Mar 2026
William R. Gupp	Sr VP, CLO & Secretary	$8,633,872			Mixed	02 May 2023
Bryan Horix Fairbanks	President and CEO	$6,918,962			Mixed	01 Mar 2026
Patricia B. Robinson	Director	$4,658,022			Mixed	30 Jul 2025
Prithvi Gandhi	SVP, Chief Financial Officer	$3,169,018	+$478,841	+18%	Mixed	24 Feb 2026
Amy M. Fernandez	SVP, CLO and Secretary	$2,851,518	-$197,423	-6.5%	Mixed	01 Mar 2026
James E. Cline	Director	$2,846,300			Mixed	30 Jul 2025
Dennis Charles Schemm	SVP, Chief Financial Officer	$2,835,989			Mixed	01 Mar 2023
Gerald Volas	Director	$2,753,446			Mixed	30 Jul 2025
Brenda Lovcik	SVP, Chief Financial Officer	$2,333,913			Mixed	01 Mar 2025
Richard E. Posey	Retired Director	$2,314,924			Mixed	27 Jul 2022
Jay M. Gratz	Director	$2,044,785			Mixed	30 Jul 2025
Ronald W. Kaplan	Director	$1,627,006			Mixed	30 Jul 2025
Rudolph Jacob T.	Svp, Chro	$1,575,244	+$5,642	+0.36%	Mixed	01 Mar 2026
Michael F. Golden	Former Director	$1,039,222			Mixed	26 Jul 2023
Zachary C. Lauer	SVP, Chief Operations Officer	$1,026,570			Median	28 Apr 2026
Kristine L. Juster	Director	$854,234			Mixed	30 Jul 2025
Gena C. Lovett	Director	$534,608			Mixed	30 Jul 2025
B. Andrew Rose	Director	$522,095	+$503,560	+2717%	Mixed	01 Apr 2026
Melkeya McDuffie	Director	$189,736			Mixed	01 Oct 2025
David Christian Keffer	Director	$120,113			Mixed	01 Apr 2026
Irene Tasi	Director	$55,000			Mixed	09 Feb 2026

Top shareholders of TREX CO INC (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
BlackRock, Inc.	13D/G 13F	Company	9.8%	10,513,943	$606,759,651	$0	31 Mar 2025	13D/G 13F
WELLINGTON MANAGEMENT GROUP LLP	13D/G 13F	Company	8%	8,358,786	$338,530,833	+$45,902,578	31 Mar 2026	13D/G 13F
ALLIANCEBERNSTEIN L.P.	13D/G 13F	Company	6.1%	6,503,478	$271,585,241	-$64,283,005	31 Dec 2025	13D/G 13F
VANGUARD CAPITAL MANAGEMENT LLC	13D/G 13F	Vanguard Capital Management · Company	5.4%	5,568,825	$202,816,606	$0	31 Mar 2026	13D/G 13F
WASATCH ADVISORS LP	13D/G 13F	Company	4.8%	5,185,652	$312,487,390	-$24,328,408	30 Jun 2025	13D/G 13F
PRICE T ROWE ASSOCIATES INC /MD/	13D/G 13F	T. Rowe Price Associates, Inc. · Company	0.7%	740,731	$38,273,571	-$338,982,223	30 Sep 2025	13D/G 13F
Adam Dante Zambanini	3/4/5	EVP, Chief Operating Officer	0.22%	234,514	$9,713,569	—	01 Mar 2026	3/4/5
Bryan Horix Fairbanks	3/4/5	President and CEO	0.16%	167,044	$6,918,962	—	01 Mar 2026	3/4/5
Prithvi Gandhi	3/4/5	SVP, Chief Financial Officer	0.07%	76,454	$3,169,018	+$478,841	24 Feb 2026	3/4/5
Patricia B. Robinson	3/4/5	Director	0.07%	70,331	$4,658,022	—	30 Jul 2025	3/4/5
Amy M. Fernandez	3/4/5	SVP, CLO and Secretary	0.07%	68,844	$2,851,518	-$197,423	01 Mar 2026	3/4/5
James E. Cline	3/4/5	Director	0.04%	42,976	$2,846,300	—	30 Jul 2025	3/4/5
Gerald Volas	3/4/5	Director	0.04%	41,574	$2,753,446	—	30 Jul 2025	3/4/5
Rudolph Jacob T.	3/4/5	SVP, CHRO	0.04%	38,031	$1,575,244	+$5,642	01 Mar 2026	3/4/5
Jay M. Gratz	3/4/5	Director	0.03%	30,874	$2,044,785	—	30 Jul 2025	3/4/5
Zachary C. Lauer	3/4/5	SVP, Chief Operations Officer	0.03%	28,187	$1,026,570	—	28 Apr 2026	3/4/5
Ronald W. Kaplan	3/4/5	Director	0.02%	24,566	$1,627,006	—	30 Jul 2025	3/4/5
B. Andrew Rose	3/4/5	Director	0.01%	14,883	$522,095	+$503,560	01 Apr 2026	3/4/5
Kristine L. Juster	3/4/5	Director	0.01%	12,898	$854,234	—	30 Jul 2025	3/4/5
Gena C. Lovett	3/4/5	Director	0.01%	8,072	$534,608	—	30 Jul 2025	3/4/5
Melkeya McDuffie	3/4/5	Director	0%	3,653	$189,736	—	01 Oct 2025	3/4/5
David Christian Keffer	3/4/5	Director	0%	3,424	$120,113	—	01 Apr 2026	3/4/5
Irene Tasi	3/4/5	Director	0%	1,256	$55,000	—	09 Feb 2026	3/4/5
VANGUARD PORTFOLIO MANAGEMENT LLC	13F	Company	4.3%	4,484,695	$163,332,592	—	31 Mar 2026	13F
AQR CAPITAL MANAGEMENT LLC	13F	Company	4.1%	4,246,384	$152,657,497	—	31 Mar 2026	13F
STATE STREET CORP	13F	Company	3.1%	3,250,111	$118,369,043	—	31 Mar 2026	13F
MORGAN STANLEY	13F	Company	2%	2,140,250	$77,947,906	—	31 Mar 2026	13F
Clearbridge Investments, LLC	13F	Company	2%	2,121,121	$77,251,211	—	31 Mar 2026	13F
BANK OF AMERICA CORP /DE/	13F	Company	1.9%	2,020,399	$73,582,931	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	1.9%	1,975,680	$71,972,896	—	31 Mar 2026	13F
Impax Asset Management Group plc	13F	Company	1.7%	1,766,368	$64,331,123	—	31 Mar 2026	13F
WESTWOOD HOLDINGS GROUP INC	13F	Company	1.7%	1,748,611	$63,684,412	—	31 Mar 2026	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	1.6%	1,700,549	$61,928,542	—	31 Mar 2026	13F
AMERICAN CENTURY COMPANIES INC	13F	Company	1.6%	1,676,015	$61,040,529	—	31 Mar 2026	13F
FEDERATED HERMES, INC.	13F	Company	1.4%	1,484,345	$54,059,845	—	31 Mar 2026	13F
FULLER & THALER ASSET MANAGEMENT, INC.	13F	Company	1.4%	1,474,843	$53,713,782	—	31 Mar 2026	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	1.4%	1,462,425	$53,261,519	—	31 Mar 2026	13F
Point72 Asset Management, L.P.	13F	Company	1.3%	1,367,429	$49,801,764	—	31 Mar 2026	13F
CITADEL ADVISORS LLC	13F	Company	1.3%	1,341,239	$48,847,925	—	31 Mar 2026	13F
JACOBS LEVY EQUITY MANAGEMENT, INC	13F	Company	1.2%	1,269,354	$46,229,873	—	31 Mar 2026	13F
Freestone Grove Partners LP	13F	Company	1.2%	1,243,615	$45,292,458	—	31 Mar 2026	13F
MARSHALL WACE, LLP	13F	Company	1.2%	1,235,056	$44,980,738	—	31 Mar 2026	13F
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	13F	Company	1.2%	1,232,064	$44,871,771	—	31 Mar 2026	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	1%	1,088,143	$39,630,168	—	31 Mar 2026	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.98%	1,024,482	$37,311,634	—	31 Mar 2026	13F
Woodline Partners LP	13F	Company	0.93%	975,958	$35,544,390	—	31 Mar 2026	13F
Nuveen, LLC	13F	Company	0.9%	939,457	$34,215,024	—	31 Mar 2026	13F
D. E. Shaw & Co., Inc.	13F	Company	0.85%	892,699	$32,512,098	—	31 Mar 2026	13F
NORTHERN TRUST CORP	13F	Company	0.85%	886,066	$32,270,523	—	31 Mar 2026	13F
FMR LLC	13F	Company	0.79%	820,359	$29,877,480	—	31 Mar 2026	13F

Recent Insider Transactions by Companies or Individuals for TREX CO INC

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
David Christian Keffer	TREX	Common Stock	Award	5.39%			175	3,424	01 Apr 2026	Direct
B. Andrew Rose	TREX	Common Stock	Award	4.94%			700	14,883	01 Apr 2026	Direct
B. Andrew Rose	TREX	Common Stock	Purchase	552.1%	$488,582	$40.69	12,008	14,183	03 Mar 2026	Direct
B. Andrew Rose	TREX	Common Stock	Purchase	20.6%	$14,977	$40.26	372	2,175	02 Mar 2026	Direct
Amy M. Fernandez	TREX	Common Stock	Tax liability	-6.13%			-4,496	68,844	01 Mar 2026	Direct
Amy M. Fernandez	TREX	Common Stock	Other	-1.46%			-1,083	73,340	01 Mar 2026	Direct
Amy M. Fernandez	TREX	Common Stock	Award	2.63%			1,910	74,423	01 Mar 2026	Direct
Rudolph Jacob T.	TREX	Common Stock	Tax liability	-6.97%			-2,850	38,031	01 Mar 2026	Direct
Rudolph Jacob T.	TREX	Common Stock	Other	-1.6%			-663	40,881	01 Mar 2026	Direct
Rudolph Jacob T.	TREX	Common Stock	Award	3.1%			1,250	41,544	01 Mar 2026	Direct
Bryan Horix Fairbanks	TREX	Common Stock	Tax liability	-12.2%			-23,127	167,044	01 Mar 2026	Direct
Bryan Horix Fairbanks	TREX	Common Stock	Other	-2.9%			-5,678	190,171	01 Mar 2026	Direct
Bryan Horix Fairbanks	TREX	Common Stock	Award	5.16%			9,609	195,849	01 Mar 2026	Direct
Adam Dante Zambanini	TREX	Common Stock	Tax liability	-3.41%			-8,271	234,514	01 Mar 2026	Direct
Adam Dante Zambanini	TREX	Common Stock	Other	-0.79%			-1,928	242,785	01 Mar 2026	Direct
Adam Dante Zambanini	TREX	Common Stock	Award	1.5%			3,623	244,713	01 Mar 2026	Direct
Rudolph Jacob T.	TREX	Common Stock	Award	45.7%			12,642	40,294	24 Feb 2026	Direct
Amy M. Fernandez	TREX	Common Stock	Award	39%			20,362	72,513	24 Feb 2026	Direct
Prithvi Gandhi	TREX	Common Stock	Award	149.3%			45,790	76,454	24 Feb 2026	Direct
Adam Dante Zambanini	TREX	Common Stock	Award	18.6%			37,828	241,090	24 Feb 2026	Direct
Irene Tasi	TREX	Common Stock	Award				1,256	1,256	09 Feb 2026	Direct
B. Andrew Rose	TREX	Common Stock	Award	14.3%			225	1,803	02 Jan 2026	Direct
David Christian Keffer	TREX	Common Stock	Award	5.8%			178	3,249	02 Jan 2026	Direct
B. Andrew Rose	TREX	Common Stock	Award				1,578	1,578	03 Dec 2025	Direct
Prithvi Gandhi	TREX	Common Stock	Purchase	95.8%	$478,840	$31.92	15,000	30,664	14 Nov 2025	Direct
Amy M. Fernandez	TREX	Common Stock	Award	127.2%			29,198	52,151	06 Nov 2025	Direct
Prithvi Gandhi	TREX	Common Stock	Award				15,664	15,664	06 Nov 2025	Direct
Rudolph Jacob T.	TREX	Common Stock	Purchase	0.21%	$2,591	$43.92	59	27,652	10 Oct 2025	Direct
Melkeya McDuffie	TREX	Common Stock	Award	1.36%			49	3,653	01 Oct 2025	Direct
David Christian Keffer	TREX	Common Stock	Award	4.17%			123	3,071	01 Oct 2025	Direct
Amy M. Fernandez	TREX	Common Stock	Sale	-6.28%	$98,711	$64.18	-1,538	22,953	06 Aug 2025	Direct
Amy M. Fernandez	TREX	Common Stock	Gift	-0.32%			-78	24,491	06 Aug 2025	Direct
Amy M. Fernandez	TREX	Common Stock	Sale	-6.28%	$98,711	$64.18	-1,538	22,953	06 Aug 2025	Direct
Amy M. Fernandez	TREX	Common Stock	Gift	-0.32%			-78	24,491	06 Aug 2025	Direct
Gerald Volas	TREX	Common Stock	Award	4.56%			1,812	41,574	30 Jul 2025	Direct
Melkeya McDuffie	TREX	Common Stock	Award	101.1%			1,812	3,604	30 Jul 2025	Direct
Patricia B. Robinson	TREX	Common Stock	Award	2.64%			1,812	70,331	30 Jul 2025	Direct
Gena C. Lovett	TREX	Common Stock	Award	29%			1,812	8,072	30 Jul 2025	Direct
David Christian Keffer	TREX	Common Stock	Award	116.1%			1,584	2,948	30 Jul 2025	Direct
Ronald W. Kaplan	TREX	Common Stock	Award	7.96%			1,812	24,566	30 Jul 2025	Direct
Kristine L. Juster	TREX	Common Stock	Award	16.3%			1,812	12,898	30 Jul 2025	Direct
Jay M. Gratz	TREX	Common Stock	Award	6.23%			1,812	30,874	30 Jul 2025	Direct
James E. Cline	TREX	Common Stock	Award	4.4%			1,812	42,976	30 Jul 2025	Direct
Rudolph Jacob T.	TREX	Common Stock	Purchase	0.24%	$3,051	$46.22	66	27,593	03 Jul 2025	Direct
Melkeya McDuffie	TREX	Common Stock	Award	2.52%			44	1,792	01 Jul 2025	Direct
David Christian Keffer	TREX	Common Stock	Award	8.86%			111	1,364	01 Jul 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.