As of April 17, 2026, Praxis Precision Medicines's top three insider holders are Capital Management, L.P. Adage (TenPercentOwner, 2.36Mn shares), Capital Management, L.P. Adage (TenPercentOwner, 2.06Mn shares), Marcio Souza (Chief Executive Officer, 76.89K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Capital Management, L.P. Adage | - | 0 | 2,361,485 | 17 Oct, 2025 |
| Capital Management, L.P. Adage | - | 0 | 2,060,175 | 17 Oct, 2025 |
| Marcio Souza | Chief Executive Officer | 76,890 | 0 | 12 Jan, 2026 |
| Nicole Sweeny | Chief Commercial Officer | 38,619 | 0 | 13 Feb, 2023 |
| Timothy Edwin Kelly | Chief Financial Officer | 31,046 | 0 | 13 Jan, 2026 |
| Megan Sniecinski | Chief Operating Officer | 28,530 | 0 | 13 Jan, 2026 |
| William D Young | - | 28,473 | 0 | 07 Jul, 2021 |
| Alex Nemiroff | General Counsel And Secretary | 25,933 | 0 | 13 Jan, 2026 |
| Dean J Mitchell | - | 17,251 | 0 | 25 Sep, 2025 |
| Jill Desimone | - | 14,500 | 0 | 10 Oct, 2023 |
| Lauren Mastrocola | Principal Accounting Officer | 13,446 | 0 | 13 Jan, 2026 |
| Gregory Norden | - | 2,826 | 0 | 07 Jul, 2021 |
| Marcio Souza | Chief Executive Officer | 0 | 2,600 | 31 Dec, 2025 |
| Jeffrey B Kindler | - | 1,166 | 0 | 10 Feb, 2026 |
| Stuart A Arbuckle | - | 1,166 | 0 | 10 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 06 Feb, 2026 | Stuart A Arbuckle | Common Stock | A | 688 | $0.00 | 688 | D | A |
| 06 Feb, 2026 | Jeffrey B Kindler | Common Stock | A | 688 | $0.00 | 688 | D | A |
| 06 Feb, 2026 | Jeffrey B Kindler | Common Stock | A | 478 | $0.00 | 1,166 | D | A |
| 06 Feb, 2026 | Stuart A Arbuckle | Common Stock | A | 478 | $0.00 | 1,166 | D | A |
| 06 Feb, 2026 | Jeffrey B Kindler | Stock Option (Right to Buy) | A | 224 | $0.00 | 224 | D | A |
| 06 Feb, 2026 | Stuart A Arbuckle | Stock Option (Right to Buy) | A | 224 | $0.00 | 224 | D | A |
| 12 Jan, 2026 | Lauren Mastrocola | Common Stock | D | 344 | $275.74 | 13,446 | D | F |
| 12 Jan, 2026 | Alex Nemiroff | Common Stock | D | 768 | $275.74 | 25,933 | D | F |
| 12 Jan, 2026 | Megan Sniecinski | Common Stock | D | 885 | $275.74 | 28,530 | D | F |
| 12 Jan, 2026 | Timothy Edwin Kelly | Common Stock | D | 943 | $275.74 | 31,046 | D | F |
| 08 Jan, 2026 | Marcio Souza | Common Stock | A | 27,640 | $0.00 | 81,142 | D | A |
| 08 Jan, 2026 | Timothy Edwin Kelly | Common Stock | A | 8,800 | $0.00 | 33,324 | D | A |
| 08 Jan, 2026 | Alex Nemiroff | Common Stock | A | 6,875 | $0.00 | 27,618 | D | A |
| 08 Jan, 2026 | Megan Sniecinski | Common Stock | A | 9,625 | $0.00 | 30,502 | D | A |
| 08 Jan, 2026 | Lauren Mastrocola | Common Stock | A | 3,750 | $0.00 | 14,157 | D | A |
| 10 Jan, 2026 | Megan Sniecinski | Common Stock | D | 1,087 | $288.45 | 29,415 | D | F |
| 10 Jan, 2026 | Timothy Edwin Kelly | Common Stock | D | 1,335 | $288.45 | 31,989 | D | F |
| 10 Jan, 2026 | Marcio Souza | Common Stock | D | 4,252 | $288.45 | 76,890 | D | F |
| 10 Jan, 2026 | Alex Nemiroff | Common Stock | D | 917 | $288.45 | 26,701 | D | F |
| 10 Jan, 2026 | Lauren Mastrocola | Common Stock | D | 367 | $288.45 | 13,790 | D | F |