Ecovyst Inc. (ECVT) Ownership
ECVT ownership summary
as of October 18, 2026- Institutions
- 103.1% of shares outstanding
- Insiders
- 1.88% of shares outstanding
- Shares outstanding
- 109.5M
- Float
- 99.1M shares available to trade
- Short interest
- 5.52% 5.9M shares short
- Days to cover
- 4.67 short interest up 15.8% vs prior month
- Institutions 103.11%
- Insiders 1.88%
ECVT top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.74% | 10.7M | $109.6M | +1.9M (+22.1%) | June 30, 2026 |
| 2 | Rubric Capital Management LP | 7.50% | 8.2M | $84.4M | −924,179 (−10.1%) | June 30, 2026 |
| 3 | Dimensional Fund Advisors, Inc. | 6.02% | 6.6M | $67.7M | +86,393 (+1.3%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 5.56% | 6.1M | $62.6M | +846,516 (+16.1%) | June 30, 2026 |
| 5 | FMR Inc | 4.87% | 5.3M | $54.8M | +866,276 (+19.4%) | June 30, 2026 |
| 6 | Arrowstreet Capital Limited Partnership | 4.69% | 5.1M | $52.8M | +303,913 (+6.3%) | June 30, 2026 |
| 7 | Vanguard Capital Management, LLC | 4.42% | 4.8M | $49.8M | −133,719 (−2.7%) | June 30, 2026 |
| 8 | Brown Advisory Holdings Inc | 4.14% | 4.5M | $46.6M | −308,659 (−6.4%) | June 30, 2026 |
| 9 | American Century Companies Inc | 3.17% | 3.5M | $35.7M | +1.4M (+71.6%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.88% | 3.1M | $32.4M | +386,373 (+14.0%) | June 30, 2026 |
| 11 | Brightline Capital Management LLC | 2.75% | 3.0M | $31.0M | +212,000 (+7.6%) | June 30, 2026 |
| 12 | State Street Corp | 2.44% | 2.7M | $27.5M | +97,641 (+3.8%) | June 30, 2026 |
| 13 | The Goldman Sachs Group Inc | 2.39% | 2.6M | $26.9M | +1.2M (+86.3%) | June 30, 2026 |
| 14 | Ameriprise Financial Inc | 2.04% | 2.2M | $22.9M | +97,841 (+4.6%) | June 30, 2026 |
| 15 | First Wilshire Securities Mgmt Inc (CA) | 1.98% | 2.2M | $22.3M | −25,546 (−1.2%) | June 30, 2026 |
| 16 | AltraVue Capital, LLC | 1.83% | 2.0M | $20.6M | +2.0M (0.0%) | June 30, 2026 |
| 17 | Charles Schwab Investment Management Inc | 1.73% | 1.9M | $19.5M | −228,029 (−10.7%) | June 30, 2026 |
| 18 | Qube Research & Technologies | 1.52% | 1.7M | $17.1M | +1.7M (0.0%) | June 30, 2026 |
| 19 | Allspring Global Investments Holdings, LLC | 1.29% | 1.4M | $14.5M | −2.4M (−62.9%) | June 30, 2026 |
| 20 | Hotchkis & Wiley Capital Management LLC | 1.28% | 1.4M | $14.4M | −4.0M (−74.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 11.2M shares and 7 cut 8.0M.
ECVT top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.18% | 3.5M | $35.7M | — | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 2.59% | 2.8M | $29.1M | −32,640 (−1.1%) | September 30, 2026 |
| 3 | Vanguard Small Cap Index | 2.30% | 2.5M | $25.9M | −1,329 (−0.1%) | August 31, 2026 |
| 4 | Brown Advisory Small-Cap Fdmtl Val Inv | 2.24% | 2.5M | $25.2M | +290,440 (+13.4%) | August 31, 2026 |
| 5 | Avantis US Small Cap Value ETF | 1.93% | 2.1M | $21.7M | — | September 30, 2026 |
| 6 | Fidelity Stock Selector Small Cap | 1.66% | 1.8M | $18.7M | +776,962 (+74.8%) | July 31, 2026 |
| 7 | Vanguard MStar Small Cap Value Index | 1.46% | 1.6M | $16.4M | +1,266 (+0.1%) | August 31, 2026 |
| 8 | DFA US Small Cap Value I | 1.38% | 1.5M | $15.6M | — | August 31, 2026 |
| 9 | Fidelity Advisor Small Cap I | 1.22% | 1.3M | $13.7M | +889,846 (+201.7%) | July 31, 2026 |
| 10 | Fidelity Small Cap Index | 1.10% | 1.2M | $12.4M | +10,247 (+0.9%) | July 31, 2026 |
| 11 | Fidelity Series Small Cap Opps | 1.08% | 1.2M | $12.1M | +473,647 (+67.2%) | July 31, 2026 |
| 12 | Columbia Small Cap Value Discv A | 0.95% | 1.0M | $10.7M | +6,400 (+0.6%) | August 31, 2026 |
| 13 | Needham Aggressive Growth Retail | 0.93% | 1.0M | $10.5M | — | June 30, 2026 |
| 14 | Allspring Special Small Cap Value A | 0.84% | 919K | $9.5M | −31,014 (−3.3%) | August 31, 2026 |
| 15 | DFA US Targeted Value I | 0.78% | 853K | $8.8M | — | August 31, 2026 |
| 16 | iShares Russell 2000 Growth ETF | 0.72% | 792K | $8.1M | −1,002 (−0.1%) | September 30, 2026 |
| 17 | Dimensional US Targeted Value ETF | 0.68% | 747K | $7.7M | +91 (+0.0%) | September 30, 2026 |
| 18 | Schwab Fundamental U.S. Small CompanyETF | 0.64% | 696K | $7.2M | +987 (+0.1%) | September 30, 2026 |
| 19 | Dimensional US Small Cap Value ETF | 0.60% | 656K | $6.7M | +322 (+0.0%) | September 24, 2026 |
| 20 | Vanguard Russell 2000 ETF | 0.58% | 634K | $6.5M | +14,406 (+2.3%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ECVT insider transactions
latest 5| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2024-08-07 | Paul Whittleston | Buy | $6.50 | 7,800 | $50,700 |
| 2024-08-05 | Joseph S Koscinski | Buy | $6.26 | 4,807 | $30,092 |
| 2024-03-22 | Susan F Ward | Sell | $10.28 | 24,436 | $251,202 |
| 2023-08-23 | Kurt Bitting | Buy | $9.64 | 3,100 | $29,884 |
| 2023-05-26 | Ltd Ineos | Sell | $10.88 | 14,000,000 | $152.3M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ECVT shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ECVT
Institutional investors own 103.1% of Ecovyst's shares and insiders 1.88%. The largest holder is BlackRock Inc with 9.74% of the shares (10.7M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 7 reduced their stake in the latest filings. Short interest is 5.52% of the float, or 4.67 days of average trading volume. The share count rose 11,345.4% since 2014.
Related: ECVT analyst forecast, ECVT key metrics. See the ECVT stock overview for the latest quote and news.
ECVT ownership FAQ
Who owns the most Ecovyst stock?
The largest shareholders of Ecovyst are BlackRock Inc (9.74%), Rubric Capital Management LP (7.50%), Dimensional Fund Advisors, Inc. (6.02%), Vanguard Portfolio Management, LLC (5.56%), FMR Inc (4.87%).
What percentage of Ecovyst is owned by institutions?
Institutions hold 103.1% of Ecovyst's shares outstanding; insiders hold 1.88%.
Which funds own Ecovyst?
The largest fund holders of Ecovyst are Vanguard MStar Total Stk Mkt Idx Invest (3.18%), iShares Russell 2000 ETF (2.59%), Vanguard Small Cap Index (2.30%), Brown Advisory Small-Cap Fdmtl Val Inv (2.24%), Avantis US Small Cap Value ETF (1.93%).
What is Ecovyst's short interest?
5.9M shares of Ecovyst were sold short, 5.52% of the float; at the average daily volume it would take 4.67 days to cover.
Are insiders buying or selling Ecovyst?
Of the latest 5 reported insider transactions in Ecovyst (since May 26, 2023), 3 were purchases and 2 were sales.
How many shares of Ecovyst are outstanding?
Ecovyst has 109.5M shares outstanding, of which 99.1M are in the public float.