Who owns CWST (CWST)
Which tracked institutional funds hold CWST, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CWST 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 CWST is one-sided between 2025-Q4 and 2026-Q1: 54 added or opened and 173 trimmed or exited — on balance reducing.
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
CWST’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes CWST more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in CWST 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 402 tracked filers holding CWST, 196 increased or opened the position and 211 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 CWST 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 30
- VANGUARD PORTFOLIO MANAGEMENT LLC$266M
- VANGUARD CAPITAL MANAGEMENT LLC$222M
- Point72 Asset Management, L.P.$37M
- SCHRODER INVESTMENT MANAGEMENT GROUP$35M
- VANGUARD FIDUCIARY TRUST CO$35M
- Capital World Investors$31M
Full exits 19
- VANGUARD GROUP INC$635M
- COMERICA BANK$36M
- Yaupon Capital Management LP$19M
- Congruence Capital, LLC$17M
- WCM INVESTMENT MANAGEMENT, LLC$16M
- INTRINSIC EDGE CAPITAL MANAGEMENT LLC$6M
Largest adds
- T. Rowe Price Investment Management, Inc.$109M
- FIFTH THIRD BANCORP$30M
- Woodline Partners LP$28M
- Zimmer Partners, LP$19M
- Clearbridge Investments, LLC$17M
- BAMCO INC /NY/$13M
Largest trims
- BlackRock, Inc.$229M
- WASATCH ADVISORS LP$164M
- Invesco Ltd.$143M
- WESTFIELD CAPITAL MANAGEMENT CO LP$98M
- Capital Research Global Investors$59M
- Conestoga Capital Advisors, LLC$50M
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 |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 8,294,668 | $658M | 10.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 3,353,241 | $266M | 4.2% | 2026-Q1 |
| Conestoga Capital Advisors, LLC added | 2,804,475 | $223M | 3.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,798,927 | $222M | 3.5% | 2026-Q1 |
| WASATCH ADVISORS LP trimmed | 2,582,220 | $205M | 3.2% | 2026-Q1 |
| STATE STREET CORP added | 2,389,197 | $190M | 3.0% | 2026-Q1 |
| Capital Research Global Investors trimmed | 2,330,165 | $185M | 2.9% | 2026-Q1 |
| Capital International Investors trimmed | 1,952,820 | $155M | 2.4% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. added | 1,699,490 | $135M | 2.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,553,163 | $123M | 1.9% | 2026-Q1 |
| Invesco Ltd. trimmed | 1,534,029 | $122M | 1.9% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 1,358,874 | $107M | 1.7% | 2026-Q1 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 1,257,092 | $100M | 1.6% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 1,252,042 | $99M | 1.6% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 1,211,802 | $96M | 1.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,195,294 | $95M | 1.5% | 2026-Q1 |
| GENEVA CAPITAL MANAGEMENT LLC trimmed | 1,163,087 | $92M | 1.4% | 2026-Q1 |
| Clearbridge Investments, LLC added | 1,141,729 | $91M | 1.4% | 2026-Q1 |
| EARNEST PARTNERS LLC trimmed | 1,133,077 | $90M | 1.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 1,067,132 | $85M | 1.3% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,050,770 | $83M | 1.3% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC trimmed | 953,777 | $76M | 1.2% | 2026-Q1 |
| UBS Group AG added | 932,817 | $74M | 1.2% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 924,375 | $73M | 1.1% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 835,425 | $66M | 1.0% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP trimmed | 822,492 | $65M | 1.0% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 780,338 | $62M | 1.0% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC added | 721,890 | $59M | 0.9% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 724,354 | $57M | 0.9% | 2026-Q1 |
| BAMCO INC /NY/ added | 718,461 | $57M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP added | 711,776 | $56M | 0.9% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 652,700 | $52M | 0.8% | 2026-Q1 |
| BROWN ADVISORY INC trimmed | 649,492 | $52M | 0.8% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 608,654 | $48M | 0.8% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 593,009 | $47M | 0.7% | 2026-Q1 |
| NORGES BANK added | 421,639 | $47M | 0.7% | 2026-Q1 |
| TimesSquare Capital Management, LLC trimmed | 574,238 | $46M | 0.7% | 2026-Q1 |
| LONDON CO OF VIRGINIA trimmed | 532,707 | $42M | 0.7% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC added | 526,659 | $42M | 0.7% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 525,062 | $42M | 0.7% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 463,949 | $37M | 0.6% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 448,049 | $35M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 438,906 | $35M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 436,116 | $35M | 0.5% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 426,703 | $34M | 0.5% | 2026-Q1 |
| Woodline Partners LP added | 415,406 | $33M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 396,195 | $31M | 0.5% | 2026-Q1 |
| Capital World Investors new | 392,100 | $31M | 0.5% | 2026-Q1 |
| Select Equity Group, L.P. added | 391,974 | $31M | 0.5% | 2026-Q1 |
| FIFTH THIRD BANCORP added | 387,531 | $31M | 0.5% | 2026-Q1 |
| Boston Trust Walden Corp added | 384,785 | $31M | 0.5% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 345,826 | $27M | 0.4% | 2026-Q1 |
| Ranger Investment Management, L.P. trimmed | 341,689 | $27M | 0.4% | 2026-Q1 |
| DF DENT & CO INC trimmed | 327,585 | $26M | 0.4% | 2026-Q1 |
| Global Alpha Capital Management Ltd. trimmed | 325,827 | $26M | 0.4% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 305,665 | $24M | 0.4% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 292,603 | $23M | 0.4% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 292,163 | $23M | 0.4% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL added | 290,464 | $23M | 0.4% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 284,290 | $23M | 0.4% | 2026-Q1 |
| Harvey Partners, LLC added | 281,500 | $22M | 0.3% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 276,629 | $22M | 0.3% | 2026-Q1 |
| Zimmer Partners, LP added | 257,694 | $20M | 0.3% | 2026-Q1 |
| Rockefeller Capital Management L.P. added | 255,656 | $20M | 0.3% | 2026-Q1 |
| Granahan Investment Management, LLC trimmed | 250,262 | $20M | 0.3% | 2026-Q1 |
| Aberdeen Group plc added | 249,564 | $20M | 0.3% | 2026-Q1 |
| GW&K Investment Management, LLC added | 232,277 | $18M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 223,578 | $18M | 0.3% | 2026-Q1 |
| Tidal Investments LLC added | 221,882 | $18M | 0.3% | 2026-Q1 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 211,037 | $17M | 0.3% | 2026-Q1 |
| THORNBURG INVESTMENT MANAGEMENT INC trimmed | 203,167 | $16M | 0.3% | 2026-Q1 |
| Aristotle Capital Boston, LLC added | 195,954 | $16M | 0.2% | 2026-Q1 |
| Summit Creek Advisors LLC trimmed | 186,780 | $15M | 0.2% | 2026-Q1 |
| CREDIT AGRICOLE S A trimmed | 186,341 | $15M | 0.2% | 2026-Q1 |
| Nuveen, LLC trimmed | 174,944 | $14M | 0.2% | 2026-Q1 |
| RIVERBRIDGE PARTNERS LLC new | 173,205 | $14M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 167,841 | $13M | 0.2% | 2026-Q1 |
| HALLSTATT ADVISORS L.P. added | 165,385 | $13M | 0.2% | 2026-Q1 |
| Granite Investment Partners, LLC trimmed | 163,583 | $13M | 0.2% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 154,074 | $12M | 0.2% | 2026-Q1 |
| OSTERWEIS CAPITAL MANAGEMENT INC trimmed | 148,270 | $12M | 0.2% | 2026-Q1 |
| Fenimore Asset Management Inc added | 146,534 | $12M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 144,081 | $11M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 123,600 | $10M | 0.2% | 2026-Q1 |
| Thrivent Financial for Lutherans trimmed | 120,364 | $10M | 0.1% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 120,248 | $10M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 119,559 | $9M | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 112,986 | $9M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 6,481,309 | $635M | 9.9% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 1,046,398 | $99M | 1.6% | 2025-Q3 stale |
| COMERICA BANK trimmed | 368,287 | $36M | 0.6% | 2025-Q4 stale |
| Yaupon Capital Management LP new | 192,855 | $19M | 0.3% | 2025-Q4 stale |
| FIL Ltd trimmed | 158,803 | $18M | 0.3% | 2025-Q1 stale |
| Congruence Capital, LLC new | 171,186 | $17M | 0.3% | 2025-Q4 stale |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 156,949 | $16M | 0.2% | 2025-Q4 stale |
| Forge First Asset Management Inc. added | 161,722 | $15M | 0.2% | 2025-Q3 stale |
| Visualize Group LP trimmed | 19,695 | $15M | 0.2% | 2025-Q2 stale |
| Man Group plc added | 153,923 | $15M | 0.2% | 2025-Q3 stale |
| MILLENNIUM MANAGEMENT LLC added | 119,691 | $11M | 0.2% | 2025-Q3 stale |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 100,000 | $9M | 0.1% | 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.