The public view is the crawlable proof. The same sourced dataset is available through REST and MCP for agents, research scripts, and back-office tools.
| Date | Insider | Role | Action | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 17, 2025 | Elms Steve | Director | Grant(A) | 84K | — | $0 |
| Nov 17, 2025 | Elms Steve | Director | Grant(A) | 137K | — | $0 |
| Nov 17, 2025 | Eansor Norman David | Director | Grant(A) | 84K | — | $0 |
| Nov 17, 2025 | Eansor Norman David | Director | Grant(A) | 137K | — | $0 |
| Nov 17, 2025 | Knobil Katharine | Director | Grant(A) | 137K | — | $0 |
| Nov 17, 2025 | Knobil Katharine | Director | Grant(A) | 84K | — | $0 |
| Oct 31, 2025 | Vera Juan | Chief Executive Officer, Director | Grant(A) | 250K | — | $0 |
| Oct 31, 2025 | Corzo Kathryn Penkus | Director | Grant(A) | 148K | — | $0 |
| Feb 12, 2025 | Vera Juan | President and CEO, Director | Grant(A) | 50K | — | $0 |
| Feb 12, 2025 | Eansor Norman David | Director | Grant(A) | 30K | — | $0 |
| Feb 12, 2025 | Knobil Katharine | Director | Grant(A) | 30K | — | $0 |
| Feb 12, 2025 | Elms Steve | Director | Grant(A) | 30K | — | $0 |
| Dec 23, 2024 | NEA Partners 16, L.P. | 10% Owner | Buy(P) | 554K | $3.20 | $1.8M |
| Dec 23, 2024 | Elms Steve | Director | Buy(P) | 11K | $3.20 | $35K |
| Jun 6, 2023 | Elms Steve | Director | Grant(A) | 8K | — | $0 |
| Jun 6, 2023 | Wilson John Robert | Director | Grant(A) | 8K | — | $0 |
| Jun 6, 2023 | Knobil Katharine | Director | Grant(A) | 8K | — | $0 |
| Jun 6, 2023 | Eansor Norman David | Director | Grant(A) | 8K | — | $0 |
| May 10, 2023 | Vera Juan | President and CEO, Director | Grant(A) | 100K | — | $0 |
| Feb 27, 2023 | Agopyan Nadia | SVP, Regulatory Affairs | Grant(A) | 34K | — | $0 |
| Feb 27, 2023 | Szymanska Anna | Vice President, Quality | Grant(A) | 30K | — | $0 |
| Feb 27, 2023 | Vera Juan | Chief Scientific Officer & COO, Director | Grant(A) | 46K | — | $0 |
| Feb 27, 2023 | Loiacono Michael | Chief Accounting Officer | Grant(A) | 38K | — | $0 |
| Feb 27, 2023 | Koneru Mythili | Chief Medical Officer | Grant(A) | 52K | — | $0 |
| Feb 27, 2023 | Hoang Tsvetelina P | VP, Research and Development | Grant(A) | 33K | — | $0 |
| May 24, 2022 | Eansor Norman David | Director | Grant(A) | 80K | — | $0 |
| May 24, 2022 | Elms Steve | Director | Grant(A) | 80K | — | $0 |
| May 24, 2022 | Knobil Katharine | Director | Grant(A) | 80K | — | $0 |
| May 24, 2022 | Laskow-Pooley David | Director | Grant(A) | 80K | — | $0 |
| May 24, 2022 | Wilson John Robert | Director | Grant(A) | 80K | — | $0 |
| Mar 24, 2022 | Kim Anthony H. | Chief Financial Officer | Grant(A) | 151K | — | $0 |
| Mar 24, 2022 | Kim Anthony H. | Chief Financial Officer | Tax withholding(F) | 36K | $0.48 | $17K |
| Mar 24, 2022 | Vera Juan | Chief Scientific Officer & COO, Director | Grant(A) | 141K | — | $0 |
| Mar 24, 2022 | Vera Juan | Chief Scientific Officer & COO, Director | Tax withholding(F) | 33K | $0.48 | $16K |
| Mar 24, 2022 | Hoang Peter L. | President and CEO, Director | Grant(A) | 199K | — | $0 |
| Mar 24, 2022 | Hoang Peter L. | President and CEO, Director | Tax withholding(F) | 48K | $0.48 | $23K |
| Feb 17, 2022 | Agopyan Nadia | VP, Regulatory Affairs | Grant(A) | 40K | — | $0 |
| Feb 17, 2022 | Garrett Gerald | Vice President, Clinical Ops. | Grant(A) | 40K | — | $0 |
| Feb 17, 2022 | Hoang Tsvetelina P | VP, Research and Development | Grant(A) | 40K | — | $0 |
| Feb 17, 2022 | Kim Anthony H. | Chief Financial Officer | Grant(A) | 160K | — | $0 |
| Feb 17, 2022 | Koneru Mythili | Chief Medical Officer | Grant(A) | 160K | — | $0 |
| Feb 17, 2022 | Loiacono Michael | Chief Accounting Officer | Grant(A) | 140K | — | $0 |
| Feb 17, 2022 | Szymanska Anna | Vice President, Quality | Grant(A) | 40K | — | $0 |
| Feb 17, 2022 | Vera Juan | Chief Scientific Officer & COO, Director | Grant(A) | 160K | — | $0 |
| Feb 17, 2022 | Hoang Peter L. | President and CEO, Director | Grant(A) | 430K | — | $0 |
| Dec 8, 2021 | Knobil Katharine | Director | Grant(A) | 125K | — | $0 |
| Jun 8, 2021 | Wilson John Robert | Director | Grant(A) | 13K | — | $0 |
| Jun 8, 2021 | Eansor Norman David | Director | Grant(A) | 13K | — | $0 |
| Jun 8, 2021 | Elms Steve | Director | Grant(A) | 13K | — | $0 |
| Jun 8, 2021 | Laskow-Pooley David | Director | Grant(A) | 13K | — | $0 |
| Jun 8, 2021 | Wasserman Frederick Gerald | Director | Grant(A) | 13K | — | $0 |
| May 18, 2021 | Wasserman Frederick Gerald | Director | Buy(P) | 10K | $2.41 | $24K |
| Mar 25, 2021 | Eansor Norman David | Director | Gift(G) | 7K | — | $0 |
| Mar 25, 2021 | Eansor Norman David | Director | Gift(G) | 14K | — | $0 |
| Mar 25, 2021 | Eansor Norman David | Director | Gift(G) | 7K | — | $0 |
| Mar 16, 2021 | Eansor Norman David | Director | Buy(P) | 14K | $17.50 | $250K |
| Mar 16, 2021 | Elms Steve | Director | Buy(P) | 1.1M | $1.75 | $2.0M |
| Mar 16, 2021 | Hoang Peter L. | President and CEO, Director | Buy(P) | 143K | $1.75 | $250K |
| Mar 16, 2021 | Vera Juan | Chief Development Officer | Buy(P) | 571K | $1.75 | $1000K |
| Mar 16, 2021 | Wilson John Robert | Director | Buy(P) | 1.7M | $1.75 | $3.0M |
| Mar 16, 2021 | NEA Partners 16, L.P. | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Baskett Forest | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Behbahani Ali | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Chang Carmen | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Florence Anthony A. Jr. | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Makhzoumi Mohamad | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Makower Joshua | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Sandell Scott D | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Sonsini Peter W. | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Mar 16, 2021 | Walker Paul Edward | 10% Owner | Buy(P) | 5.7M | $1.75 | $10.0M |
| Feb 11, 2021 | Hoang Peter L. | President and CEO, Director | Grant(A) | 430K | — | $0 |
| Feb 10, 2021 | Agopyan Nadia | VP, Regulatory Affairs | Grant(A) | 40K | — | $0 |
| Feb 10, 2021 | Garrett Gerald | Vice President, Clinical Ops. | Grant(A) | 40K | — | $0 |
| Feb 10, 2021 | Hoang Tsvetelina P | VP, Research and Development | Grant(A) | 40K | — | $0 |
| Feb 10, 2021 | Kim Anthony H. | Chief Financial Officer | Grant(A) | 160K | — | $0 |
| Feb 10, 2021 | Koneru Mythili | Chief Medical Officer | Grant(A) | 140K | — | $0 |
| Feb 10, 2021 | Loiacono Michael | Chief Accounting Officer | Grant(A) | 140K | — | $0 |
| Feb 10, 2021 | Szymanska Anna | Vice President, Quality | Grant(A) | 40K | — | $0 |
| Feb 10, 2021 | Vera Juan | Chief Development Officer | Grant(A) | 140K | — | $0 |
| Jun 16, 2020 | Dart Kenneth Bryan | 10% Owner | Other(J) | 417K | — | — |
| Mar 10, 2020 | Agopyan Nadia | VP, Regulatory Affairs | Grant(A) | 33K | — | $0 |
| Mar 10, 2020 | Agopyan Nadia | VP, Regulatory Affairs | Grant(A) | 7K | — | $0 |
| Mar 10, 2020 | Garrett Gerald | Vice President, Clinical Ops. | Grant(A) | 38K | — | $0 |
| Mar 10, 2020 | Garrett Gerald | Vice President, Clinical Ops. | Grant(A) | 2K | — | $0 |
| Mar 10, 2020 | Hoang Tsvetelina P | VP, Research and Development | Grant(A) | 25K | — | $0 |
| Mar 10, 2020 | Hoang Tsvetelina P | VP, Research and Development | Grant(A) | 15K | — | $0 |
| Mar 10, 2020 | Kim Anthony H. | Chief Financial Officer | Grant(A) | 128K | — | $0 |
| Mar 10, 2020 | Kim Anthony H. | Chief Financial Officer | Grant(A) | 33K | — | $0 |
| Mar 10, 2020 | Koneru Mythili | Chief Medical Officer | Grant(A) | 24K | — | $0 |
| Mar 10, 2020 | Koneru Mythili | Chief Medical Officer | Grant(A) | 116K | — | $0 |
| Mar 10, 2020 | Loiacono Michael | Chief Accounting Officer | Grant(A) | 119K | — | $0 |
| Mar 10, 2020 | Loiacono Michael | Chief Accounting Officer | Grant(A) | 21K | — | $0 |
| Mar 10, 2020 | Szymanska Anna | Vice President, Quality | Grant(A) | 33K | — | $0 |
| Mar 10, 2020 | Szymanska Anna | Vice President, Quality | Grant(A) | 8K | — | $0 |
| Mar 10, 2020 | Vera Juan | Chief Development Officer | Grant(A) | 113K | — | $0 |
| Mar 10, 2020 | Vera Juan | Chief Development Officer | Grant(A) | 27K | — | $0 |
| Mar 10, 2020 | Hoang Peter L. | President and CEO, Director | Grant(A) | 41K | — | $0 |
| Mar 10, 2020 | Hoang Peter L. | President and CEO, Director | Grant(A) | 389K | — | $0 |
| Feb 18, 2020 | Dart Kenneth Bryan | 10% Owner | Option exercise(X) | 417K | $1.20 | $500K |
| Feb 18, 2020 | Dart Kenneth Bryan | 10% Owner | Option exercise(X) | 417K | — | — |
Insider transactions sourced from SEC EDGAR Form 4 filings, normalized within minutes of acceptance. "Buy"/"Sell" mark open-market transactions (codes P/S), the tradeable signal. Awards, option exercises and tax-withholding are shown with their raw code. All data is public domain.
Coverage: Form 4 filings indexed 2006-01-02 → 2026-08-22. Earlier history is backfilling; this window widens as it deepens.
Programmatic access via the Arkolith API & MCP server (insider.transactions, insider.company).
Connected pages for MRKR