Who owns Compass Minerals International, Inc. (CMP)
Which tracked institutional funds hold CMP, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CMP 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
54 tracked funds added or opened CMP while 24 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
CMP’s largest tracked holder by dollar value, Koch, Inc., sizes it at 17.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 17.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CMP 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 204 tracked filers holding CMP, 97 increased or opened the position and 85 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 CMP 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 11
- VANGUARD CAPITAL MANAGEMENT LLC$41M
- Irenic Capital Management LP$34M
- VANGUARD PORTFOLIO MANAGEMENT LLC$13M
- JANE STREET GROUP, LLC$6M
- VANGUARD FIDUCIARY TRUST CO$6M
- Sourcerock Group LLC$5M
Full exits 9
- VANGUARD GROUP INC$49M
- Pacer Advisors, Inc.$6M
- Concentric Capital Strategies, LP$1M
- ARISTEIA CAPITAL, L.L.C.$1M
- Trexquant Investment LP$1M
- Jefferies Financial Group Inc.$1M
Largest adds
- BANK OF AMERICA CORP /DE/$26M
- Koch, Inc.$26M
- Engine Capital Management, LP$26M
- STATE STREET CORP$14M
- AMERICAN CENTURY COMPANIES INC$12M
- Ewing Morris & Co. Investment Partners Ltd.$10M
Largest trims
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$36M
- BlackRock, Inc.$12M
- Lightrock Netherlands B.V.$5M
- MARSHALL WACE, LLP$2M
- THOMPSON SIEGEL & WALMSLEY LLC$2M
- SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC$2M
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 |
|---|---|---|---|---|
| Koch, Inc. | 7,034,609 | $164M | 16.3% | 2026-Q1 |
| SailingStone Capital Partners LLC trimmed | 4,825,611 | $113M | 11.2% | 2026-Q1 |
| BlackRock, Inc. trimmed | 2,852,763 | $67M | 6.6% | 2026-Q1 |
| STATE STREET CORP added | 2,322,476 | $54M | 5.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,748,555 | $41M | 4.1% | 2026-Q1 |
| Ewing Morris & Co. Investment Partners Ltd. added | 2,014,327 | $40M | 4.0% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 1,678,675 | $39M | 3.9% | 2026-Q1 |
| Engine Capital Management, LP added | 1,439,065 | $34M | 3.3% | 2026-Q1 |
| Irenic Capital Management LP new | 1,435,529 | $34M | 3.3% | 2026-Q1 |
| Gumshoe Capital Management LLC | 1,264,883 | $30M | 2.9% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,253,045 | $29M | 2.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 913,683 | $21M | 2.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 785,144 | $18M | 1.8% | 2026-Q1 |
| Newtyn Management, LLC trimmed | 770,000 | $18M | 1.8% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 704,438 | $16M | 1.6% | 2026-Q1 |
| O'Keefe Stevens Advisory, Inc. added | 610,462 | $14M | 1.4% | 2026-Q1 |
| LEE DANNER & BASS INC added | 605,750 | $14M | 1.4% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 571,428 | $13M | 1.3% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 538,629 | $13M | 1.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 360,464 | $8M | 0.8% | 2026-Q1 |
| CastleKnight Management LP added | 351,526 | $8M | 0.8% | 2026-Q1 |
| MORGAN STANLEY trimmed | 349,837 | $8M | 0.8% | 2026-Q1 |
| Nuveen, LLC added | 289,665 | $7M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 289,482 | $7M | 0.7% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 270,955 | $6M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 249,291 | $6M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 242,399 | $6M | 0.6% | 2026-Q1 |
| Sourcerock Group LLC trimmed | 235,198 | $5M | 0.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 222,103 | $5M | 0.5% | 2026-Q1 |
| Invesco Ltd. added | 200,331 | $5M | 0.5% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 179,070 | $4M | 0.4% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 172,911 | $4M | 0.4% | 2026-Q1 |
| CITIGROUP INC added | 167,404 | $4M | 0.4% | 2026-Q1 |
| THOMPSON SIEGEL & WALMSLEY LLC trimmed | 143,364 | $3M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 141,698 | $3M | 0.3% | 2026-Q1 |
| Janney Montgomery Scott LLC added | 134,814 | $3M | 0.3% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 126,255 | $3M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 123,710 | $3M | 0.3% | 2026-Q1 |
| HRT FINANCIAL LP added | 112,357 | $3M | 0.3% | 2026-Q1 |
| Man Group plc added | 104,772 | $2M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 104,208 | $2M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 86,528 | $2M | 0.2% | 2026-Q1 |
| UBS Group AG added | 81,359 | $2M | 0.2% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 80,248 | $2M | 0.2% | 2026-Q1 |
| Jackson Creek Investment Advisors LLC new | 78,550 | $2M | 0.2% | 2026-Q1 |
| Integrated Quantitative Investments LLC new | 77,888 | $2M | 0.2% | 2026-Q1 |
| Jump Financial, LLC trimmed | 71,008 | $2M | 0.2% | 2026-Q1 |
| Swiss National Bank | 69,950 | $2M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 68,735 | $2M | 0.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 65,730 | $2M | 0.2% | 2026-Q1 |
| Krilogy Financial LLC added | 58,651 | $2M | 0.2% | 2026-Q1 |
| Lighthouse Investment Partners, LLC trimmed | 60,000 | $1M | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC added | 59,713 | $1M | 0.1% | 2026-Q1 |
| Mountain Lake Investment Management LLC added | 55,636 | $1M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 53,484 | $1M | 0.1% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 52,865 | $1M | 0.1% | 2026-Q1 |
| ASSETMARK, INC added | 49,514 | $1M | 0.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 49,026 | $1M | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 48,613 | $1M | 0.1% | 2026-Q1 |
| MARTINGALE ASSET MANAGEMENT L P added | 48,140 | $1M | 0.1% | 2026-Q1 |
| Gotham Asset Management, LLC trimmed | 45,988 | $1M | 0.1% | 2026-Q1 |
| Koss-Olinger Consulting, LLC trimmed | 45,500 | $1M | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 45,331 | $1M | 0.1% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC | 41,078 | $959K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 40,993 | $957K | 0.1% | 2026-Q1 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 40,934 | $956K | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 39,522 | $923K | 0.1% | 2026-Q1 |
| Creative Planning added | 36,220 | $846K | 0.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 35,874 | $838K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 34,758 | $812K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 33,377 | $779K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 39,467 | $775K | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 31,973 | $747K | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 31,240 | $729K | 0.1% | 2026-Q1 |
| CoreCommodity Management, LLC added | 30,997 | $724K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 2,471,001 | $49M | 4.8% | 2025-Q4 stale |
| Pacer Advisors, Inc. trimmed | 289,191 | $6M | 0.6% | 2025-Q4 stale |
| ICON ADVISERS INC/CO added | 480,000 | $4M | 0.4% | 2025-Q1 stale |
| TUDOR INVESTMENT CORP ET AL added | 163,890 | $3M | 0.3% | 2025-Q2 stale |
| Invenomic Capital Management LP trimmed | 153,576 | $3M | 0.3% | 2025-Q2 stale |
| Long Focus Capital Management, LLC added | 222,370 | $2M | 0.2% | 2025-Q1 stale |
| GROUP ONE TRADING LLC added | 76,206 | $2M | 0.2% | 2025-Q2 stale |
| SummerHaven Investment Management, LLC added | 75,155 | $2M | 0.1% | 2025-Q2 stale |
| Cove Street Capital, LLC trimmed | 71,417 | $1M | 0.1% | 2025-Q3 stale |
| Concentric Capital Strategies, LP trimmed | 65,586 | $1M | 0.1% | 2025-Q4 stale |
| GSA CAPITAL PARTNERS LLP added | 63,742 | $1M | 0.1% | 2025-Q3 stale |
| Numerai GP LLC added | 62,175 | $1M | 0.1% | 2025-Q3 stale |
| ARISTEIA CAPITAL, L.L.C. added | 56,439 | $1M | 0.1% | 2025-Q4 stale |
| Trexquant Investment LP trimmed | 53,254 | $1M | 0.1% | 2025-Q4 stale |
| Y-Intercept (Hong Kong) Ltd added | 51,845 | $1M | 0.1% | 2025-Q2 stale |
| Jefferies Financial Group Inc. | 52,711 | $1M | 0.1% | 2025-Q4 stale |
| Nebula Research & Development LLC trimmed | 49,433 | $993K | 0.1% | 2025-Q2 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 46,762 | $939K | 0.1% | 2025-Q2 stale |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 44,672 | $897K | 0.1% | 2025-Q2 stale |
| Skylands Capital, LLC added | 93,600 | $870K | 0.1% | 2025-Q1 stale |
| Bard Financial Services, Inc. trimmed | 89,700 | $833K | 0.1% | 2025-Q1 stale |
| HUSSMAN STRATEGIC ADVISORS, INC. | 42,000 | $825K | 0.1% | 2025-Q4 stale |
| HSBC HOLDINGS PLC trimmed | 39,938 | $800K | 0.1% | 2025-Q2 stale |
| Tejara Capital Ltd new | 79,751 | $741K | 0.1% | 2025-Q1 stale |
| ALGERT GLOBAL LLC added | 36,590 | $703K | 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.