Atchinson Robert
- SEC CIK
- 0001403404
In the past year, 1 open-market sale filing worth $33.2M and no purchases.
Current role at each company
- PRAX Praxis Precision Medicines, Inc.10% Owneras of Oct 17, 2025
- SLDB Solid Biosciences Inc.10% Owneras of Feb 19, 2025
- ABEO Abeona Therapeutics Inc.10% Owneras of May 8, 2024
- GCMG GCM Grosvenor Inc.10% Owneras of May 10, 2023
- ABX Abacus Global Management, Inc.10% Owneras of Jan 24, 2023
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- –
- 0 filings
- Sold
- $33.2M
- 1 filing
- Net
- −$33.2M
- Bought minus sold
- Companies
- 1
- With open-market trades
Trades
Every Form 4 that lists Atchinson Robert as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
PRAX Praxis Precision Medicines, Inc.
10% Owner2 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| 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 |
SLDB Solid Biosciences Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Feb 19, 2025 (view filing)4:16 PM ET | Feb 18 | 1 day | Atchinson Robert and 2 others10% Owner | PPurchaseCommon Stock, $0.001 par value per share | +252.5K | $7.56 | +$1.91M | +6.3%4.25M after |
ABEO Abeona Therapeutics Inc.
10% Owner1 trade
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| May 8, 2024 (view filing)4:15 PM ET | May 7 | 1 day | Atchinson Robert and 2 others10% Owner | PPurchase | +2.95M | $4.07 | +$12.0M | –2.95M after | Derivative |
GCMG GCM Grosvenor Inc.
10% Owner20 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| May 10, 2023 (view filing)7:23 PM ET | May 8 | 2 days | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock, $0.0001 par value (Common Stock) | −70.0K | $7.82 | −$547.5K | −1.6%4.32M after | |
| May 10, 2023 (view filing)7:23 PM ET | May 9-10 | 1 day | Adage Capital Partners, L.P. and 4 others10% Owner | SSale | −159.1K | $7.44 | −$1.18M | −3.7%4.16M after | 4 lots |
| May 5, 2023 (view filing)6:57 PM ET | May 3 | 2 days | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock, $0.0001 par value ("Common Stock") | −177.3K | $7.91 | −$1.40M | −3.8%4.53M after | |
| May 5, 2023 (view filing)6:57 PM ET | May 3-5 | 2 days | Adage Capital Partners, L.P. and 4 others10% Owner | SSale | −138.0K | $7.73 | −$1.07M | −3.0%4.39M after | 2 lots |
| Apr 28, 2023 (view filing)5:16 PM ET | Apr 26 | 2 days | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock, $0.0001 par value ("Class A Common Sto | −79.8K | $7.83 | −$625.1K | −1.6%4.86M after | |
| Apr 28, 2023 (view filing)5:16 PM ET | Apr 27-28 | 1 day | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock | −159.7K | $8.06 | −$1.29M | −3.3%4.70M after | 3 lots |
| Jul 13, 2021 (view filing)3:41 PM ET | May 18 | 56 daysLate | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock, $0.0001 par value | +3.45K | $12.65 | +$43.6K | +0.1%4.76M after | |
| Jul 13, 2021 (view filing)3:41 PM ET | May 19-20 | 55 daysLate | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock | −118.4K | $12.69 | −$1.50M | −2.5%4.64M after | 5 lots |
| Jul 13, 2021 (view filing)3:41 PM ET | Jun 3-21 | 40 daysLate | Adage Capital Partners, L.P. and 4 others10% Owner | PPurchaseClass A Common Stock | +299.1K | $10.51 | +$3.14M | +6.4%4.94M after | 15 lots |
| Jul 13, 2021 (view filing)3:39 PM ET | Feb 23 | 140 daysLate | Adage Capital Partners, L.P. and 4 others10% Owner | SSaleClass A Common Stock, $0.0001 par value | −395 | $13.26 | −$5.24K | 0.0%5.28M after |