Comparable stake leader
BlackRock, Inc.
SEC ownership of TREX CO INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001069878.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
01 Jul 2026
- Public ticker
- TREX on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
01 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001069878
- Issuer location
- Winchester, VA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of TREX CO INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
01 Jul 2026
13D/G
13F
3/4/5
Lead comparable stake: 9.8%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 9.8%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
9.8%
WELLINGTON MANAGEMENT GROUP LLP
8%
ALLIANCEBERNSTEIN L.P.
6.1%
VANGUARD CAPITAL MANAGEMENT LLC
5.4%
WASATCH ADVISORS LP
4.8%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
9.8%
|
$606,759,651
10,513,943 shares
|
$0 | 31 Mar 2025 |
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
Company
|
8%
|
$338,530,833
8,358,786 shares
|
+$45,902,578 | 31 Mar 2026 |
| ALLIANCEBERNSTEIN L.P. |
13D/G
13F
Company
|
6.1%
|
$271,585,241
6,503,478 shares
|
-$64,283,005 | 31 Dec 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.4%
|
$202,816,606
5,568,825 shares
|
$0 | 31 Mar 2026 |
| WASATCH ADVISORS LP |
13D/G
13F
Company
|
4.8%
|
$312,487,390
5,185,652 shares
|
-$24,328,408 | 30 Jun 2025 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
13F
T. Rowe Price Associates, Inc. · Company
|
0.7%
|
$38,273,571
740,731 shares
|
-$338,982,223 | 30 Sep 2025 |
| Adam Dante Zambanini |
3/4/5
EVP, Chief Operating Officer
|
0.22%
|
$9,713,569
234,514 shares
|
— | 01 Mar 2026 |
| Bryan Horix Fairbanks |
3/4/5
President and CEO
|
0.16%
|
$6,918,962
167,044 shares
|
— | 01 Mar 2026 |
How to read this table
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.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$717,568.
Buys
$984,991
Insiders: 3
Sells
$267,423
Insiders: 2
Net
+$717,568
Shares: +22,963
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 27,439
Shares: 4,476
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 1,400 | $0 | $70,000 | -$70,000 |
| 3-6 | 12,380 | 0 | $503,560 | $0 | +$503,560 |
| 6-9 | 15,000 | 0 | $478,840 | $0 | +$478,840 |
| 9-12 | 59 | 3,076 | $2,591 | $197,423 | -$194,832 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 22 reporting-owner rows connected to TREX CO INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
22
Largest Forms 3/4/5 holder
Adam Dante Zambanini
Net 12M change
+$717,569
Latest report
01 Jul 2026
| 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 | ||
| Rudolph Jacob T. | Svp, Chro | $1,831,550 | -$67,409 | -3.5% | Filing P/S | 25 Jun 2026 |
| Ronald W. Kaplan | Director | $1,627,006 | Mixed | 30 Jul 2025 | ||
| Michael F. Golden | Former Director | $1,039,222 | Mixed | 26 Jul 2023 | ||
| Zachary C. Lauer | SVP, Chief Operations Officer | $1,026,570 | Mixed | 28 Apr 2026 | ||
| Kristine L. Juster | Director | $854,234 | Mixed | 30 Jul 2025 | ||
| B. Andrew Rose | Director | $771,066 | +$503,560 | +188% | Median | 01 Jul 2026 |
| Gena C. Lovett | Director | $534,608 | Mixed | 30 Jul 2025 | ||
| Melkeya McDuffie | Director | $189,736 | Mixed | 01 Oct 2025 |
Recent insider transactions for TREX CO INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| B. Andrew Rose | TREX | Common Stock | Award | 3.53% | 526 | 15,409 | 01 Jul 2026 | Direct | ||
| David Christian Keffer | TREX | Common Stock | Award | 3.83% | 131 | 3,555 | 01 Jul 2026 | Direct | ||
| Rudolph Jacob T. | TREX | Common Stock | Sale | -3.68% | $70,000 | $50.00 | -1,400 | 36,631 | 25 Jun 2026 | Direct |
| 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 |
* marks a reported price that did not pass the local price check.