Follow the people · Insider
Christopher Koster
Christopher Koster files insider transactions with the SEC as a secretary & general counsel of Centene (CNC). We hold 2 disclosed purchases and sales filed since 10 February 2020, 2 of them in the last 90 days.
- Files forCNC
- Disclosed buys and sells2 in all, 2 in the last 90 days
- Last disclosure27 August 2026
Positions held
1 post we hold — a term names its own dates; a run of filings only says when they filed- Filed 7 February 2020 — 26 August 2026Secretary & General Counsel · Centene (CNC)45 Form 4 lines · source: SEC Form 4
Everything they disclosed
45 entries, newest first — one per disclosure report, one per Form 4 line- ▼ sold on the open market 56,500 shares of CenteneSEC Form 427 August 2026Common Stock · traded 26 August 2026 · filed 27 August 2026
- ▼ sold on the open market 47,603 shares of CenteneSEC Form 419 August 2026Common Stock · traded 18 August 2026 · filed 19 August 2026
- had shares withheld for tax on 9,087 shares of CenteneSEC Form 417 March 2026Common Stock · traded 15 March 2026 · filed 17 March 2026
- had shares withheld for tax on 9,087 shares of CenteneSEC Form 417 March 2026Common Stock · traded 15 March 2026 · filed 17 March 2026
- was granted 126,925 shares of CenteneSEC Form 46 February 2026Common Stock · traded 26 January 2026 · filed 6 February 2026
- was granted 126,925 shares of CenteneSEC Form 46 February 2026Common Stock · traded 26 January 2026 · filed 6 February 2026
- was granted 126,925 shares of CenteneSEC Form 428 January 2026Common Stock · traded 26 January 2026 · filed 28 January 2026
- was granted 126,925 shares of CenteneSEC Form 428 January 2026Common Stock · traded 26 January 2026 · filed 28 January 2026
- had shares withheld for tax on 4,039 shares of CenteneSEC Form 418 March 2025Common Stock · traded 15 March 2025 · filed 18 March 2025
- was granted 85,925 shares of CenteneSEC Form 418 March 2025Common Stock · traded 15 March 2025 · filed 18 March 2025
- returned to the issuer 10,661 shares of CenteneSEC Form 46 February 2025Common Stock · traded 4 February 2025 · filed 6 February 2025
- had shares withheld for tax on 3,852 shares of CenteneSEC Form 46 February 2025Common Stock · traded 4 February 2025 · filed 6 February 2025
- had shares withheld for tax on 2,518 shares of CenteneSEC Form 417 December 2024Common Stock · traded 15 December 2024 · filed 17 December 2024
- had shares withheld for tax on 1,987 shares of CenteneSEC Form 424 June 2024Common Stock · traded 23 June 2024 · filed 24 June 2024
- had shares withheld for tax on 2,135 shares of CenteneSEC Form 419 March 2024Common Stock · traded 15 March 2024 · filed 19 March 2024
- was granted 37,147 shares of CenteneSEC Form 419 March 2024Common Stock · traded 15 March 2024 · filed 19 March 2024
- was granted 6,336 shares of CenteneSEC Form 48 February 2024Common Stock · traded 6 February 2024 · filed 8 February 2024
- had shares withheld for tax on 13,449 shares of CenteneSEC Form 48 February 2024Common Stock · traded 6 February 2024 · filed 8 February 2024
- had shares withheld for tax on 4,889 shares of CenteneSEC Form 419 December 2023Common Stock · traded 15 December 2023 · filed 19 December 2023
- had shares withheld for tax on 1,994 shares of CenteneSEC Form 427 June 2023Common Stock · traded 23 June 2023 · filed 27 June 2023
- was granted 41,444 shares of CenteneSEC Form 417 March 2023Common Stock · traded 15 March 2023 · filed 17 March 2023
- was granted 324 shares of CenteneSEC Form 49 February 2023Common Stock · traded 7 February 2023 · filed 9 February 2023
- had shares withheld for tax on 6,175 shares of CenteneSEC Form 49 February 2023Common Stock · traded 7 February 2023 · filed 9 February 2023
- had shares withheld for tax on 4,928 shares of CenteneSEC Form 419 December 2022Common Stock · traded 15 December 2022 · filed 19 December 2022
- had shares withheld for tax on 1,340 shares of CenteneSEC Form 413 December 2022Common Stock · traded 10 December 2022 · filed 13 December 2022
- had shares withheld for tax on 2,010 shares of CenteneSEC Form 427 June 2022Common Stock · traded 23 June 2022 · filed 27 June 2022
- was granted 15,690 shares of Centene (a derivative holding)SEC Form 417 December 2021Common Stock Option (right to buy) · traded 15 December 2021 · filed 17 December 2021
- was granted 5,856 shares of CenteneSEC Form 417 December 2021Common Stock · traded 15 December 2021 · filed 17 December 2021
- had shares withheld for tax on 10,378 shares of CenteneSEC Form 417 December 2021Common Stock · traded 15 December 2021 · filed 17 December 2021
- was granted 36,347 shares of CenteneSEC Form 417 December 2021Common Stock · traded 15 December 2021 · filed 17 December 2021
- had shares withheld for tax on 1,343 shares of CenteneSEC Form 414 December 2021Common Stock · traded 10 December 2021 · filed 14 December 2021
- had shares withheld for tax on 1,194 shares of CenteneSEC Form 414 December 2021Common Stock · traded 11 December 2021 · filed 14 December 2021
- ▼ sold on the open market 14,300 shares of CenteneSEC Form 41 November 2021Common Stock · traded 28 October 2021 · filed 1 November 2021
- was granted 13,500 shares of CenteneSEC Form 425 June 2021Common Stock · traded 23 June 2021 · filed 25 June 2021
- had shares withheld for tax on 11,188 shares of CenteneSEC Form 428 April 2021Common Stock · traded 27 April 2021 · filed 28 April 2021
- was granted 5,746 shares of CenteneSEC Form 417 December 2020Common Stock · traded 15 December 2020 · filed 17 December 2020
- had shares withheld for tax on 7,351 shares of CenteneSEC Form 417 December 2020Common Stock · traded 15 December 2020 · filed 17 December 2020
- was granted 40,000 shares of CenteneSEC Form 417 December 2020Common Stock · traded 15 December 2020 · filed 17 December 2020
- had shares withheld for tax on 1,343 shares of CenteneSEC Form 414 December 2020Common Stock · traded 10 December 2020 · filed 14 December 2020
- had shares withheld for tax on 1,194 shares of CenteneSEC Form 414 December 2020Common Stock · traded 11 December 2020 · filed 14 December 2020
- had shares withheld for tax on 1,063 shares of CenteneSEC Form 414 December 2020Common Stock · traded 12 December 2020 · filed 14 December 2020
- was granted 48 shares of Centene (a derivative holding)SEC Form 49 March 2020Phantom Stock · traded 6 March 2020 · filed 9 March 2020
- was granted 44 shares of Centene (a derivative holding)SEC Form 421 February 2020Phantom Stock · traded 21 February 2020 · filed 21 February 2020
- had shares withheld for tax on 2,984 shares of CenteneSEC Form 421 February 2020Common Stock · traded 20 February 2020 · filed 21 February 2020
- was granted 45 shares of Centene (a derivative holding)SEC Form 410 February 2020Phantom Stock · traded 7 February 2020 · filed 10 February 2020
Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.