Who owns Ecovyst Inc. (ECVT)
Which tracked institutional funds hold ECVT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ECVT company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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
The tracked-fund tape on ECVT is one-sided between 2025-Q4 and 2026-Q1: 84 added or opened and 21 trimmed or exited — on balance accumulating.
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
ECVT’s largest tracked holder by dollar value, Rubric Capital Management LP, sizes it at 1.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ECVT 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 197 tracked filers holding ECVT, 106 increased or opened the position and 74 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 ECVT 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 26
- VANGUARD PORTFOLIO MANAGEMENT LLC$67M
- VANGUARD CAPITAL MANAGEMENT LLC$64M
- Driehaus Capital Management LLC$17M
- Congruence Capital, LLC$10M
- VANGUARD FIDUCIARY TRUST CO$9M
- Dayah Capital LLC$6M
Full exits 10
- VANGUARD GROUP INC$99M
- MANGROVE PARTNERS IM, LLC$53M
- Medina Value Partners, LLC$21M
- THOMPSON SIEGEL & WALMSLEY LLC$13M
- Forest Hill Capital, LLC$4M
- Nierenberg Investment Management Company, LLC$2M
Largest adds
- FMR LLC$53M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$49M
- DIMENSIONAL FUND ADVISORS LP$21M
- AMERICAN CENTURY COMPANIES INC$20M
- BRIGHTLINE CAPITAL MANAGEMENT, LLC$16M
- Rubric Capital Management LP$15M
Largest trims
- HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC$23M
- Invenomic Capital Management LP$13M
- SHAPIRO CAPITAL MANAGEMENT LLC$12M
- OAKTREE CAPITAL MANAGEMENT LP$11M
- NewEdge Advisors, LLC$8M
- HARBOR CAPITAL ADVISORS, INC.$3M
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 |
|---|---|---|---|---|
| Rubric Capital Management LP trimmed | 9,136,067 | $117M | 7.0% | 2026-Q1 |
| BlackRock, Inc. trimmed | 8,734,220 | $112M | 6.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 6,498,654 | $84M | 4.9% | 2026-Q1 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC trimmed | 5,413,862 | $70M | 4.1% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 5,244,406 | $67M | 4.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 4,977,580 | $64M | 3.8% | 2026-Q1 |
| BROWN ADVISORY INC trimmed | 4,842,174 | $62M | 3.7% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 4,829,034 | $62M | 3.7% | 2026-Q1 |
| FMR LLC added | 4,467,334 | $57M | 3.4% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC trimmed | 3,798,389 | $50M | 3.0% | 2026-Q1 |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC added | 2,800,000 | $36M | 2.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,763,454 | $36M | 2.1% | 2026-Q1 |
| STATE STREET CORP added | 2,577,391 | $33M | 2.0% | 2026-Q1 |
| OAKTREE CAPITAL MANAGEMENT LP trimmed | 2,393,791 | $31M | 1.8% | 2026-Q1 |
| FIRST WILSHIRE SECURITIES MANAGEMENT INC added | 2,196,784 | $28M | 1.7% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 2,131,663 | $27M | 1.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 2,126,914 | $27M | 1.6% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 2,025,270 | $26M | 1.5% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 1,864,621 | $24M | 1.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,406,885 | $18M | 1.1% | 2026-Q1 |
| Owls Nest Partners IA, LLC trimmed | 1,374,674 | $18M | 1.0% | 2026-Q1 |
| Driehaus Capital Management LLC new | 1,356,131 | $17M | 1.0% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 1,225,131 | $16M | 0.9% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,106,009 | $14M | 0.8% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 1,049,527 | $13M | 0.8% | 2026-Q1 |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 1,020,000 | $13M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP added | 958,764 | $12M | 0.7% | 2026-Q1 |
| SEI INVESTMENTS CO added | 938,031 | $12M | 0.7% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 834,793 | $11M | 0.6% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 821,390 | $11M | 0.6% | 2026-Q1 |
| BRIGADE CAPITAL MANAGEMENT, LP | 817,255 | $11M | 0.6% | 2026-Q1 |
| Congruence Capital, LLC new | 815,443 | $10M | 0.6% | 2026-Q1 |
| Allianz Asset Management GmbH added | 805,698 | $10M | 0.6% | 2026-Q1 |
| SHAPIRO CAPITAL MANAGEMENT LLC trimmed | 766,762 | $10M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 731,724 | $9M | 0.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 722,625 | $9M | 0.6% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 649,778 | $8M | 0.5% | 2026-Q1 |
| Empowered Funds, LLC added | 566,680 | $7M | 0.4% | 2026-Q1 |
| Ballast Asset Management, LP added | 554,625 | $7M | 0.4% | 2026-Q1 |
| SG Americas Securities, LLC added | 516,569 | $7M | 0.4% | 2026-Q1 |
| Dayah Capital LLC new | 470,000 | $6M | 0.4% | 2026-Q1 |
| UBS Group AG added | 433,465 | $6M | 0.3% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 422,463 | $5M | 0.3% | 2026-Q1 |
| Invenomic Capital Management LP trimmed | 418,265 | $5M | 0.3% | 2026-Q1 |
| KESTREL INVESTMENT MANAGEMENT CORP trimmed | 405,400 | $5M | 0.3% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 392,193 | $5M | 0.3% | 2026-Q1 |
| SummitTX Capital, L.P. new | 390,106 | $5M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 382,233 | $5M | 0.3% | 2026-Q1 |
| Invesco Ltd. added | 377,455 | $5M | 0.3% | 2026-Q1 |
| CastleKnight Management LP | 367,148 | $5M | 0.3% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 338,599 | $4M | 0.3% | 2026-Q1 |
| Tiptree Advisors, LLC new | 325,000 | $4M | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 310,322 | $4M | 0.2% | 2026-Q1 |
| Nuveen, LLC trimmed | 312,714 | $4M | 0.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 306,700 | $4M | 0.2% | 2026-Q1 |
| VARCOV Co. added | 278,682 | $4M | 0.2% | 2026-Q1 |
| UMB Bank, n.a. | 272,651 | $4M | 0.2% | 2026-Q1 |
| WEDGE CAPITAL MANAGEMENT L L P/NC trimmed | 256,583 | $3M | 0.2% | 2026-Q1 |
| MIRABELLA FINANCIAL SERVICES LLP added | 239,526 | $3M | 0.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 238,003 | $3M | 0.2% | 2026-Q1 |
| HARBOR CAPITAL ADVISORS, INC. trimmed | 234,136 | $3M | 0.2% | 2026-Q1 |
| Swiss National Bank | 225,600 | $3M | 0.2% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 186,701 | $2M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 180,872 | $2M | 0.1% | 2026-Q1 |
| Massar Capital Management, LP new | 178,976 | $2M | 0.1% | 2026-Q1 |
| Man Group plc trimmed | 166,063 | $2M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 151,668 | $2M | 0.1% | 2026-Q1 |
| ExodusPoint Capital Management, LP added | 149,388 | $2M | 0.1% | 2026-Q1 |
| EASTERLY INVESTMENT PARTNERS LLC trimmed | 135,610 | $2M | 0.1% | 2026-Q1 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM added | 130,361 | $2M | 0.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 129,221 | $2M | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 128,080 | $2M | 0.1% | 2026-Q1 |
| Bleakley Financial Group, LLC added | 117,741 | $2M | 0.1% | 2026-Q1 |
| Campbell & CO Investment Adviser LLC added | 117,420 | $2M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 10,182,271 | $99M | 5.9% | 2025-Q4 stale |
| MANGROVE PARTNERS IM, LLC trimmed | 5,447,873 | $53M | 3.1% | 2025-Q4 stale |
| Western Standard LLC added | 3,566,876 | $29M | 1.7% | 2025-Q2 stale |
| Boston Partners trimmed | 3,225,459 | $28M | 1.7% | 2025-Q3 stale |
| Medina Value Partners, LLC added | 2,192,017 | $21M | 1.3% | 2025-Q4 stale |
| THOMPSON SIEGEL & WALMSLEY LLC trimmed | 1,366,711 | $13M | 0.8% | 2025-Q4 stale |
| Yaupon Capital Management LP added | 900,000 | $7M | 0.4% | 2025-Q2 stale |
| Simcoe Capital Management, LLC new | 767,640 | $7M | 0.4% | 2025-Q3 stale |
| Voss Capital, LP trimmed | 641,317 | $5M | 0.3% | 2025-Q2 stale |
| EVR Research LP trimmed | 600,000 | $5M | 0.3% | 2025-Q2 stale |
| Shay Capital LLC added | 517,000 | $4M | 0.3% | 2025-Q2 stale |
| Ghisallo Capital Management LLC added | 500,000 | $4M | 0.2% | 2025-Q2 stale |
| Forest Hill Capital, LLC | 391,900 | $4M | 0.2% | 2025-Q4 stale |
| Kent Lake PR LLC new | 400,000 | $3M | 0.2% | 2025-Q2 stale |
| RAYMOND JAMES FINANCIAL INC | 346,137 | $3M | 0.2% | 2025-Q3 stale |
| CAPSTONE INVESTMENT ADVISORS, LLC added | 350,000 | $3M | 0.2% | 2025-Q2 stale |
| Cove Street Capital, LLC trimmed | 313,713 | $3M | 0.2% | 2025-Q3 stale |
| DSC Meridian Capital LP new | 300,000 | $2M | 0.1% | 2025-Q2 stale |
| Burkehill Global Management, LP new | 300,000 | $2M | 0.1% | 2025-Q2 stale |
| NEXPOINT ASSET MANAGEMENT, L.P. | 287,687 | $2M | 0.1% | 2025-Q2 stale |
| SOROS FUND MANAGEMENT LLC new | 286,674 | $2M | 0.1% | 2025-Q2 stale |
| Jain Global LLC new | 284,300 | $2M | 0.1% | 2025-Q2 stale |
| Nierenberg Investment Management Company, LLC | 228,810 | $2M | 0.1% | 2025-Q4 stale |
| Trexquant Investment LP trimmed | 220,166 | $2M | 0.1% | 2025-Q2 stale |
| Clearline Capital LP added | 168,144 | $1M | 0.1% | 2025-Q3 stale |
| Atom Investors LP trimmed | 149,116 | $1M | 0.1% | 2025-Q4 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.