CMP · Insider trading · 13F holders · Congress trades
Compass Minerals International Inc (CMP)
Who is buying and selling CMP: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 11
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 1
CMP at a glance
- No open-market insider purchases or sales of CMP were filed in the last 90 days.
- 11 13F filers hold CMP among their 50 largest positions, worth $468.4M combined. The biggest bets by portfolio weight are Koch, Inc. (20.0%), SailingStone Capital Partners LLC (19.5%) and Ewing Morris & Co. Investment Partners Ltd. (7.7%).
- Members of Congress have disclosed 11 CMP trades since 2017, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $1K–15K on Oct 11, 2023.
- CMP last closed at $22.92 on Oct 30, 2026.
CMP insider trading
No open-market insider purchases or sales of CMP were filed in the last 90 days.
Who owns CMP? Hedge funds and superinvestors
11 13F filers hold CMP among their 50 largest positions, worth $468.4M combined. The biggest bets by portfolio weight are Koch, Inc. (20.0%), SailingStone Capital Partners LLC (19.5%) and Ewing Morris & Co. Investment Partners Ltd. (7.7%).
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Koch, Inc.Investment manager | 20.0% | $219.0M | 7,034,609 | +0.0% shares | Q2 2026 |
| SailingStone Capital Partners LLCHedge fund | 19.5% | $104.3M | 3,351,366 | -30.6% shares | Q2 2026 |
| Irenic Capital Management LPHedge fund | 2.4% | $33.3M | 1,068,378 | -25.6% shares | Q2 2026 |
| Gumshoe Capital Management LLCHedge fund | 24.8% | $27.2M | 872,348 | -31.0% shares | Q2 2026 |
| Engine Capital Management, LPHedge fund | 1.9% | $19.7M | 633,021 | -56.0% shares | Q2 2026 |
| Newtyn Management, LLCHedge fund | 2.5% | $19.7M | 632,326 | -17.9% shares | Q2 2026 |
| Ewing Morris & Co. Investment Partners Ltd.Hedge fund | 7.7% | $14.8M | 570,800 | -71.7% shares | Q2 2026 |
| O'Keefe Stevens Advisory, Inc.Wealth manager | 3.0% | $14.5M | 657,161 | +4.1% shares | Q3 2026 |
| Lee Danner & Bass IncWealth manager | 0.7% | $12.6M | 570,750 | -1.7% shares | Q3 2026 |
| Mountain Lake Investment Management LLCHedge fund | 1.1% | $1.7M | 55,756 | +0.2% shares | Q2 2026 |
| Jackson Creek Investment Advisors LLCMutual fund manager | 0.5% | $1.7M | 56,354 | — | Q2 2026 |
Each manager counts with its latest 13F (Q3 2026: 2, Q2 2026: 9). Screen CMP in the grand portfolio →
CMP stock trades by members of Congress
Members of Congress have disclosed 11 CMP trades since 2017, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $1K–15K on Oct 11, 2023.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Nov 17, 2023 | Kevin HernR-OK · House | Sale | $1K–15K | Oct 11, 2023 | -16.9% |
| Dec 13, 2021 | Josh GottheimerD-NJ · House | Sale | $1K–15K | Nov 16, 2021 | -59.8% |
| Sep 23, 2021 | Thomas R. SuozziD-NY · House | Sale | $15K–50K | Jan 5, 2017 | -71.2% |
| Feb 17, 2021 | Chris JacobsR-NY · House | Sale | $1K–15K | Jan 4, 2021 | -62.9% |
| Feb 18, 2020 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Jan 29, 2020 | -61.0% |
| Feb 10, 2020 | Josh GottheimerD-NJ · House | Buy | $1K–15K | Jan 10, 2020 | -60.7% |
| Jan 10, 2020 | Gilbert Ray Cisneros, Jr.D-CA · House | Sale | $1K–15K | Dec 30, 2019 | -62.4% |
| Jan 6, 2020 | Josh GottheimerD-NJ · House | Sale | $1K–15K | Dec 10, 2019 | -59.2% |
| Aug 19, 2019 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Jul 30, 2019 | -60.2% |
| Sep 29, 2018 | Gary J. PalmerR-AL · House | Buy | $1K–15K | Aug 6, 2018 | -66.4% |
| Sep 29, 2018 | Gary J. PalmerR-AL · House | Buy | $1K–15K | Apr 4, 2017 | -66.8% |
6 members have traded CMP: Kevin Hern, Josh Gottheimer, Thomas R. Suozzi, Chris Jacobs, Gilbert Ray Cisneros, Jr., Gary J. Palmer.
CMP questions and answers
Are insiders buying CMP stock?
No open-market insider purchases or sales of CMP were filed in the last 90 days.
Which hedge funds own CMP?
11 13F filers hold CMP among their 50 largest positions, worth $468.4M combined. The biggest bets by portfolio weight are Koch, Inc. (20.0%), SailingStone Capital Partners LLC (19.5%) and Ewing Morris & Co. Investment Partners Ltd. (7.7%).
Has Congress traded CMP?
Members of Congress have disclosed 11 CMP trades since 2017, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $1K–15K on Oct 11, 2023.
Who is the largest holder of CMP?
Among 13F filers, Koch, Inc. reports the largest CMP position, $219.0M (7,034,609 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Koch, Inc.'s: 20.0% of its portfolio.
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