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Atchinson Robert

In the past year, 1 open-market sale filing worth $33.2M and no purchases.

Current role at each company

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

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Oct 17, 2025 (view filing)4:10 PM ETOct 161 dayAtchinson Robert and 2 others10% OwnerSSaleCommon 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 ETOct 161 dayAtchinson Robert and 2 others10% OwnerSSale+301.3K$106.42+$32.1M+17.1%2.06M after9 lots

SLDB Solid Biosciences Inc.

10% Owner1 trade

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Feb 19, 2025 (view filing)4:16 PM ETFeb 181 dayAtchinson Robert and 2 others10% OwnerPPurchaseCommon 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

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
May 8, 2024 (view filing)4:15 PM ETMay 71 dayAtchinson Robert and 2 others10% OwnerPPurchase+2.95M$4.07+$12.0M–2.95M afterDerivative

GCMG GCM Grosvenor Inc.

10% Owner20 trades

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Jul 13, 2021 (view filing)3:36 PM ETNov 20, 2020235 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerPPurchaseClass A Common Stock, $0.0001 par value Class A Common Stock+100$9.31+$9310.0%5.94M after
Jul 13, 2021 (view filing)3:36 PM ETNov 25, 2020-Jan 7, 2021230 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerPPurchaseClass A Common Stock+112.4K$11.91+$1.34M+2.0%5.64M after9 lots
Jul 13, 2021 (view filing)3:36 PM ETDec 8, 2020-Jan 6, 2021217 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock−336.3K$13.63−$4.58M−5.6%5.64M after18 lots
Jul 13, 2021 (view filing)3:36 PM ETDec 9, 2020216 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerPPurchaseClass A Common Stock−24.0K$14.02−$335.8K−0.4%5.82M after
Jul 13, 2021 (view filing)3:36 PM ETDec 10, 2020215 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock+50.0K$14.02+$701.0K+0.9%5.65M after
Jul 13, 2021 (view filing)3:37 PM ETJan 12182 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock, $0.0001 par value−15.0K$13.39−$200.8K−0.3%5.63M after
Jul 13, 2021 (view filing)3:37 PM ETJan 12-Feb 23182 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock−388.9K$13.45−$5.23M−6.9%5.28M after27 lots
Jul 13, 2021 (view filing)3:37 PM ETFeb 22141 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerPPurchaseClass A Common Stock+46.0K$12.79+$588.1K+0.9%5.33M after2 lots
Jul 13, 2021 (view filing)3:39 PM ETFeb 23140 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock, $0.0001 par value−395$13.26−$5.24K0.0%5.28M after
Jul 13, 2021 (view filing)3:39 PM ETFeb 24-May 10139 daysLateAdage Capital Partners, L.P. and 4 others10% OwnerSSaleClass A Common Stock−567.1K$13.08−$7.42M−10.7%4.72M after27 lots

See all 20 trades at GCMG