Who owns Trex Company, Inc. (TREX)
Which tracked institutional funds hold TREX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See TREX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
110 tracked funds added or opened TREX while 90 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
TREX’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes TREX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in TREX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 420 tracked filers holding TREX, 221 increased or opened the position and 208 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in TREX between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 23
- VANGUARD CAPITAL MANAGEMENT LLC$173M
- VANGUARD PORTFOLIO MANAGEMENT LLC$163M
- WESTWOOD HOLDINGS GROUP INC$64M
- FULLER & THALER ASSET MANAGEMENT, INC.$54M
- VANGUARD FIDUCIARY TRUST CO$24M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$24M
Full exits 34
- VANGUARD GROUP INC$316M
- TWO SIGMA ADVISERS, LP$20M
- DekaBank Deutsche Girozentrale$20M
- Long Pond Capital, LP$17M
- TORONTO DOMINION BANK$14M
- Baird Financial Group, Inc.$12M
Largest adds
- WELLINGTON MANAGEMENT GROUP LLP$50M
- MARSHALL WACE, LLP$40M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$38M
- BALYASNY ASSET MANAGEMENT L.P.$21M
- BANK OF AMERICA CORP /DE/$19M
- TWO SIGMA INVESTMENTS, LP$19M
Largest trims
- BlackRock, Inc.$136M
- PRINCIPAL FINANCIAL GROUP INC$30M
- D. E. Shaw & Co., Inc.$30M
- NORGES BANK$27M
- MILLENNIUM MANAGEMENT LLC$24M
- JANE STREET GROUP, LLC$20M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP added | 8,343,296 | $304M | 6.4% | 2026-Q1 |
| BlackRock, Inc. trimmed | 6,303,490 | $230M | 4.8% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 6,430,978 | $226M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 4,748,412 | $173M | 3.6% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,484,695 | $163M | 3.4% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 4,236,030 | $152M | 3.2% | 2026-Q1 |
| WASATCH ADVISORS LP trimmed | 3,536,750 | $129M | 2.7% | 2026-Q1 |
| STATE STREET CORP added | 3,250,111 | $118M | 2.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 2,140,250 | $78M | 1.6% | 2026-Q1 |
| Clearbridge Investments, LLC trimmed | 2,121,121 | $77M | 1.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 2,020,399 | $74M | 1.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,975,680 | $72M | 1.5% | 2026-Q1 |
| Impax Asset Management Group plc trimmed | 1,766,368 | $64M | 1.3% | 2026-Q1 |
| WESTWOOD HOLDINGS GROUP INC added | 1,748,611 | $64M | 1.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,700,549 | $62M | 1.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 1,676,015 | $61M | 1.3% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 1,484,345 | $54M | 1.1% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 1,474,843 | $54M | 1.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,462,425 | $53M | 1.1% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 1,367,429 | $50M | 1.0% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,341,239 | $49M | 1.0% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 1,269,354 | $46M | 1.0% | 2026-Q1 |
| Freestone Grove Partners LP trimmed | 1,243,615 | $45M | 1.0% | 2026-Q1 |
| MARSHALL WACE, LLP added | 1,235,056 | $45M | 0.9% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,232,064 | $45M | 0.9% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,088,143 | $40M | 0.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,024,482 | $37M | 0.8% | 2026-Q1 |
| NORGES BANK trimmed | 619,127 | $36M | 0.8% | 2026-Q1 |
| Woodline Partners LP added | 975,958 | $36M | 0.7% | 2026-Q1 |
| Nuveen, LLC added | 939,457 | $34M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 886,066 | $32M | 0.7% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 882,428 | $32M | 0.7% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 776,254 | $28M | 0.6% | 2026-Q1 |
| GENEVA CAPITAL MANAGEMENT LLC trimmed | 749,658 | $27M | 0.6% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 747,556 | $27M | 0.6% | 2026-Q1 |
| FMR LLC trimmed | 746,535 | $27M | 0.6% | 2026-Q1 |
| Amundi added | 719,154 | $26M | 0.5% | 2026-Q1 |
| Grantham, Mayo, Van Otterloo & Co. LLC added | 680,153 | $25M | 0.5% | 2026-Q1 |
| DISCIPLINED GROWTH INVESTORS INC /MN trimmed | 678,357 | $25M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 665,164 | $24M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp added | 649,458 | $24M | 0.5% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 647,178 | $24M | 0.5% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 640,830 | $23M | 0.5% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 585,891 | $21M | 0.4% | 2026-Q1 |
| Hill City Capital, LP trimmed | 550,000 | $20M | 0.4% | 2026-Q1 |
| SEI INVESTMENTS CO added | 547,526 | $20M | 0.4% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 525,856 | $19M | 0.4% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 510,580 | $19M | 0.4% | 2026-Q1 |
| DAVENPORT & Co LLC trimmed | 507,350 | $18M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 497,084 | $18M | 0.4% | 2026-Q1 |
| Heron Bay Capital Management added | 465,865 | $17M | 0.4% | 2026-Q1 |
| BANK OF NOVA SCOTIA added | 427,361 | $16M | 0.3% | 2026-Q1 |
| CONFLUENCE INVESTMENT MANAGEMENT LLC new | 390,641 | $14M | 0.3% | 2026-Q1 |
| UBS Group AG added | 378,065 | $14M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 360,149 | $13M | 0.3% | 2026-Q1 |
| CITIGROUP INC trimmed | 343,231 | $13M | 0.3% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 330,864 | $12M | 0.3% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 314,399 | $11M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 294,598 | $11M | 0.2% | 2026-Q1 |
| LOOMIS SAYLES & CO L P added | 292,831 | $11M | 0.2% | 2026-Q1 |
| Man Group plc added | 289,374 | $11M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 278,690 | $10M | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 270,446 | $10M | 0.2% | 2026-Q1 |
| Walleye Capital LLC added | 255,714 | $9M | 0.2% | 2026-Q1 |
| Voleon Capital Management LP added | 243,215 | $9M | 0.2% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 9,004,832 | $316M | 6.6% | 2025-Q4 stale |
| Anomaly Capital Management, LP added | 2,307,739 | $119M | 2.5% | 2025-Q3 stale |
| Conestoga Capital Advisors, LLC trimmed | 1,894,949 | $98M | 2.1% | 2025-Q3 stale |
| Madison Asset Management, LLC added | 1,893,081 | $98M | 2.1% | 2025-Q3 stale |
| MACQUARIE GROUP LTD added | 1,652,402 | $85M | 1.8% | 2025-Q3 stale |
| BAMCO INC /NY/ added | 1,589,735 | $82M | 1.7% | 2025-Q3 stale |
| Liontrust Investment Partners LLP | 1,405,194 | $76M | 1.6% | 2025-Q3 stale |
| Kinetic Partners Management, LP new | 1,059,900 | $58M | 1.2% | 2025-Q2 stale |
| Capital Research Global Investors | 705,297 | $36M | 0.8% | 2025-Q3 stale |
| Stephens Investment Management Group LLC trimmed | 699,776 | $36M | 0.8% | 2025-Q3 stale |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 639,397 | $33M | 0.7% | 2025-Q3 stale |
| Broad Bay Capital Management, LP added | 537,220 | $31M | 0.7% | 2025-Q1 stale |
| Artisan Partners Limited Partnership trimmed | 463,116 | $27M | 0.6% | 2025-Q1 stale |
| AustralianSuper Pty Ltd trimmed | 474,226 | $26M | 0.5% | 2025-Q2 stale |
| Pembroke Management, LTD added | 476,311 | $25M | 0.5% | 2025-Q3 stale |
| Aperture Investors, LLC added | 406,610 | $21M | 0.4% | 2025-Q3 stale |
| Ophir Asset Management Pty Ltd new | 398,865 | $21M | 0.4% | 2025-Q3 stale |
| TWO SIGMA ADVISERS, LP added | 574,500 | $20M | 0.4% | 2025-Q4 stale |
| DekaBank Deutsche Girozentrale | 200,000 | $20M | 0.4% | 2025-Q4 stale |
| Epoch Investment Partners, Inc. trimmed | 335,756 | $20M | 0.4% | 2025-Q1 stale |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 320,339 | $18M | 0.4% | 2025-Q1 stale |
| Fisher Asset Management, LLC added | 329,124 | $17M | 0.4% | 2025-Q3 stale |
| Long Pond Capital, LP new | 484,286 | $17M | 0.4% | 2025-Q4 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 250,000 | $15M | 0.3% | 2025-Q1 stale |
| AMERICAN CAPITAL MANAGEMENT INC added | 280,737 | $15M | 0.3% | 2025-Q3 stale |
| TORONTO DOMINION BANK added | 400,343 | $14M | 0.3% | 2025-Q4 stale |
| FRED ALGER MANAGEMENT, LLC trimmed | 215,079 | $12M | 0.3% | 2025-Q1 stale |
| Baird Financial Group, Inc. trimmed | 354,436 | $12M | 0.3% | 2025-Q4 stale |
| Montanaro Asset Management Ltd trimmed | 302,462 | $11M | 0.2% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC trimmed | 202,287 | $10M | 0.2% | 2025-Q3 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 297,227 | $10M | 0.2% | 2025-Q4 stale |
| OSTERWEIS CAPITAL MANAGEMENT INC added | 195,296 | $10M | 0.2% | 2025-Q3 stale |
| LONDON CO OF VIRGINIA trimmed | 252,509 | $9M | 0.2% | 2025-Q4 stale |
| Kanen Wealth Management LLC new | 250,000 | $9M | 0.2% | 2025-Q4 stale |
| FIL Ltd new | 169,500 | $9M | 0.2% | 2025-Q3 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.