Praxis Precision Medicines, Inc.
PRAX- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001689548
No open-market purchases or sales by Praxis Precision Medicines, Inc. insiders were filed in the last 90 days; 309 institutions reported holding it in 13F filings for Q2 2026, worth $11.3B in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Praxis Precision Medicines, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 0 filings
- Open-market sells
- 0 filings
- Insiders trading
- 0
- Net value
- $0
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Praxis Precision Medicines, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Souza Marcio | Chief Executive Officer | 0Indirect | Jul 8, 2026 | 5 |
| DeSimone Jill | Director | 2,337 | Jun 26, 2026 | 2 |
| Kindler Jeffrey B | Director | 2,537 | Jun 12, 2026 | 2 |
| Mitchell Dean J | Director | 18,622 | Jun 12, 2026 | 1 |
| Young William D | Director | 3,269 | Jun 12, 2026 | 1 |
| Norden Gregory | Director | 1,559 | Jun 12, 2026 | 1 |
| Arbuckle Stuart A | Director | 2,537 | Jun 12, 2026 | 2 |
| Chodakewitz Jeffrey | Director | 1,371 | Jun 12, 2026 | 1 |
| Cudkowicz Merit Ester | Director | 1,371 | Jun 12, 2026 | 1 |
| Sniecinski Megan | Chief Operating Officer | 28,664 | May 19, 2026 | 3 |
| Mastrocola Lauren | Principal Accounting Officer | 13,573 | May 19, 2026 | 5 |
| Nemiroff Alex | General Counsel and Secretary | 26,011 | May 19, 2026 | 5 |
| Kelly Timothy Edwin | Chief Financial Officer | 31,167 | May 19, 2026 | 5 |
| Atchinson Robert | 10% Owner | 2,060,175Indirect | Oct 17, 2025 | 1 |
| Gross Phillip | 10% Owner | 2,060,175Indirect | Oct 17, 2025 | 1 |
| Adage Capital Management, L.P. | 10% Owner | 2,060,175Indirect | Oct 17, 2025 | 1 |
| Sweeny Nicole | Chief Commercial Officer | 38,619 | Feb 13, 2023 | 0 |
| Ravina Bernard | Chief Medical Officer | 99,476 | Jun 24, 2022 | 0 |
| Vitorovic Stefan | Director | – | May 27, 2022 | 0 |
| Schwarzman Stephen A | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Inc. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Group Management L.L.C. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Holdings I L.P. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Holdings I/II GP L.L.C. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Holdings II L.P. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Strategic Opportunity Associates L.L.C. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| Blackstone Alternative Solutions L.L.C. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
| BSOF Parallel Master Fund L.P. | 10% Owner | 0Indirect | Oct 8, 2021 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jun 26, 2026 (view filing) | Jun 24 | 2 days | DeSimone JillDirector | SSale | −11.6K | $311.32 | −$3.61M | −83.2%2.34K after | 12 lots10b5-1 |
| Nov 21, 2025 (view filing) | Nov 20 | 1 day | Nemiroff AlexGeneral Counsel and Secretary | SSale | −25.1K | $193.08 | −$4.85M | −54.7%20.8K after | 4 lots |
| Nov 21, 2025 (view filing) | Nov 20 | 1 day | Mastrocola LaurenPrincipal Accounting Officer | SSale | −13.6K | $192.08 | −$2.61M | −56.6%10.4K after | 2 lots |
| Oct 17, 2025 (view filing)4:10 PM ET | Oct 16 | 1 day | Atchinson Robert and 2 others10% Owner | SSaleCommon Stock, $0.0001 par value per share ("Common Stock") | +12.6K | $90.00 | +$1.13M | +0.5%2.36M after | |
| Oct 17, 2025 (view filing)4:10 PM ET | Oct 16 | 1 day | Atchinson Robert and 2 others10% Owner | SSale | +301.3K | $106.42 | +$32.1M | +17.1%2.06M after | 9 lots |
| Nov 15, 2024 (view filing) | Nov 14 | 1 day | Nemiroff AlexGeneral Counsel and Secretary | SSale | −8.24K | $80.20 | −$660.8K | −44.4%10.3K after | |
| Nov 15, 2024 (view filing) | Nov 14 | 1 day | Mastrocola LaurenPrincipal Accounting Officer | SSale | −5.19K | $81.78 | −$424.3K | −48.0%5.61K after | |
| Oct 10, 2023 (view filing) | Oct 5 | 5 days | DeSimone JillDirector | PPurchase | +14.5K | $1.75 | +$25.4K | New position14.5K after | |
| Jun 27, 2023 (view filing) | Jun 27 | Same day | Souza MarcioChief Executive Officer | PPurchase | +10.0K | $1.06 | +$10.6K | +28.6%45.0K after | |
| Apr 6, 2023 (view filing) | Mar 24 | 13 days | Kelly Timothy EdwinChief Financial Officer | PPurchase | +8.00K | $0.87 | +$6.96K | +20.8%46.4K after | Amended |
| Mar 27, 2023 (view filing) | Mar 23 | 4 days | Souza MarcioChief Executive Officer | PPurchase | +35.0K | $0.86 | +$30.1K | +18.3%226.3K after | |
| Mar 27, 2023 (view filing) | Mar 23 | 4 days | Souza MarcioChief Executive Officer | PPurchase | +35.0K | $0.86 | +$30.1K | New position35.0K after | |
| Mar 27, 2023 (view filing) | Mar 24 | 3 days | Mitchell Dean JDirector | PPurchase | +50.0K | $0.84 | +$42.0K | +200.0%75.0K after | |
| Jun 21, 2022 (view filing) | Jun 16 | 5 days | Mastrocola LaurenPrincipal Accounting Officer | PPurchase | +3.00K | $1.93 | +$5.79K | +10.6%31.4K after | |
| Jun 14, 2022 (view filing) | Jun 13 | 1 day | Nemiroff AlexGeneral Counsel and Secretary | PPurchase | +7.50K | $1.63 | +$12.2K | +23.6%39.3K after | |
| Jun 13, 2022 (view filing) | Jun 9 | 4 days | Kelly Timothy EdwinChief Financial Officer | PPurchase | +10.0K | $1.77 | +$17.7K | +32.8%40.5K after | |
| Jun 9, 2022 (view filing) | Jun 8 | 1 day | Souza MarcioChief Executive Officer | PPurchase | +27.0K | $1.85 | +$50.0K | +16.6%189.2K after | |
| Jun 9, 2022 (view filing) | Jun 8 | 1 day | Mitchell Dean JDirector | PPurchase | +25.0K | $1.81 | +$45.3K | New position25.0K after | |
| Oct 8, 2021 (view filing)4:33 PM ET | Oct 6 | 2 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −400.0K | $17.50 | −$7.00M | −100.0%0 after | |
| Oct 5, 2021 (view filing)5:43 PM ET | Oct 1-5 | 4 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −46.5K | $19.14 | −$890.9K | −10.4%400.0K after | 2 lots |
| Sep 2, 2021 (view filing) | Aug 31 | 2 days | Kelly Timothy EdwinChief Financial Officer | PPurchase | +3.90K | $19.48 | +$76.1K | New position3.90K after | |
| Aug 25, 2021 (view filing)4:30 PM ET | Aug 23 | 2 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −352.4K | $19.00 | −$6.70M | −44.1%446.5K after | 2 lots |
| Aug 20, 2021 (view filing)5:01 PM ET | Aug 18 | 2 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −3.00K | $15.88 | −$47.6K | −0.4%798.9K after | |
| Aug 19, 2021 (view filing) | Aug 18 | 1 day | Souza MarcioChief Executive Officer | PPurchase | +9.54K | $15.79 | +$150.7K | +12.4%86.8K after | |
| Aug 13, 2021 (view filing)4:31 PM ET | Aug 11-12 | 2 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −27.3K | $14.62 | −$398.9K | −3.3%801.9K after | 2 lots |
| Aug 5, 2021 (view filing)7:35 PM ET | Aug 3 | 2 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −22.3K | $14.99 | −$334.3K | −2.6%829.2K after | |
| Aug 3, 2021 (view filing)5:09 PM ET | Jul 30-Aug 2 | 4 days | Schwarzman Stephen A and 8 others10% Owner | SSale | −55.9K | $15.75 | −$879.8K | −6.2%851.5K after | 2 lots |