Compass Minerals International, Inc. (CMP) ownership: Top institutional holder: Koch, Inc. ($164.26M). Insider activity: Net Seller (2 buys, 18 sells). 3 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| Koch, Inc. | 7034609.00 | $164.26M | 2026-03-31 |
| SailingStone Capital Partners LLC | 4825611.00 | $112.68M | 2026-03-31 |
| BlackRock Fund Advisors | 1417151.00 | $111.03M | 2016-12-31 |
| BlackRock, Inc. | 2852763.00 | $66.61M | 2026-03-31 |
| STATE STREET CORP | 2322476.00 | $54.23M | 2026-03-31 |
| VANGUARD GROUP INC | 2757733.00 | $54.16M | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1748555.00 | $40.83M | 2026-03-31 |
| Ewing Morris & Co. Investment Partners Ltd. | 2014327.00 | $40.44M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-18 | |
| Buy | null | 2026-05-18 | |
| Sell | null | 2026-05-18 | |
| Buy | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-05-13 | |
| Sell | null | 2026-03-31 | |
| Sell | null | 2026-03-31 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.