Robert Atchinson insider trades: Praxis Precision Medicines (PRAX) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Robert reports to the SEC
and 21 more companies
Open-market buys and sales
141 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Oct 16, 2025 | PRAX | ↓ Sell | 301,310 | $106.42 | $32.1M | Indirect | Oct 17, 2025 (1d) |
| Oct 16, 2025 | PRAX | ↓ Sell | 12,600 | $90.00 | $1.1M | Indirect | Oct 17, 2025 (1d) |
| Feb 18, 2025 | SLDB | ↑ Buy | 252,545 | $7.56 | $1.9M | Indirect | Feb 19, 2025 (1d) |
| May 10, 2023 | GCMG | ↓ Sell | 159,138 | $7.44 | $1.2M | Indirect | May 10, 2023 (0d) |
| May 8, 2023 | GCMG | ↓ Sell | 70,000 | $7.82 | $548K | Indirect | May 10, 2023 (2d) |
| May 5, 2023 | GCMG | ↓ Sell | 137,972 | $7.73 | $1.1M | Indirect | May 5, 2023 (0d) |
| May 3, 2023 | GCMG | ↓ Sell | 177,252 | $7.91 | $1.4M | Indirect | May 5, 2023 (2d) |
| Apr 28, 2023 | GCMG | ↓ Sell | 159,681 | $8.06 | $1.3M | Indirect | Apr 28, 2023 (0d) |
| Apr 26, 2023 | GCMG | ↓ Sell | 79,832 | $7.83 | $625K | Indirect | Apr 28, 2023 (2d) |
| Jun 21, 2021 | GCMG | ↑ Buy | 299,102 | $10.51 | $3.1M | Indirect | Jul 13, 2021 (22d) |
| May 20, 2021 | GCMG | ↓ Sell | 118,421 | $12.69 | $1.5M | Indirect | Jul 13, 2021 (54d) |
| May 18, 2021 | GCMG | ↓ Sell | 3,448 | $12.65 | $44K | Indirect | Jul 13, 2021 (56d) |
| May 12, 2021 | GCMG | ↑ Buy | 50,200 | $11.98 | $602K | Indirect | Jul 13, 2021 (62d) |
| May 10, 2021 | GCMG | ↓ Sell | 567,059 | $13.08 | $7.4M | Indirect | Jul 13, 2021 (64d) |
| Feb 23, 2021 | GCMG | ↓ Sell | 388,910 | $13.45 | $5.2M | Indirect | Jul 13, 2021 (140d) |
| Feb 23, 2021 | GCMG | ↓ Sell | 395 | $13.26 | $5K | Indirect | Jul 13, 2021 (140d) |
| Feb 22, 2021 | GCMG | ↑ Buy | 46,000 | $12.79 | $588K | Indirect | Jul 13, 2021 (141d) |
| Jan 12, 2021 | GCMG | ↓ Sell | 15,000 | $13.39 | $201K | Indirect | Jul 13, 2021 (182d) |
| Jan 7, 2021 | GCMG | ↑ Buy | 136,337 | $12.28 | $1.7M | Indirect | Jul 13, 2021 (187d) |
| Jan 6, 2021 | GCMG | ↓ Sell | 386,316 | $13.68 | $5.3M | Indirect | Jul 13, 2021 (188d) |
| Dec 18, 2020 | RPRX | ↓ Sell | 7,301,050 | $43.92 | $320.7M | Indirect | Dec 18, 2020 (0d) |
| Dec 3, 2020 | AMCI | ↓ Sell | 1,018,465 | $12.07 | $12.3M | Indirect | Dec 3, 2020 (0d) |
| Nov 20, 2020 | GCMG | ↑ Buy | 100 | $9.31 | $931 | Indirect | Jul 13, 2021 (235d) |
| Aug 12, 2020 | ORBC | ↓ Sell | 100,000 | $4.31 | $431K | Indirect | Aug 13, 2020 (1d) |
| Jun 18, 2020 | RPRX | ↑ Buy | 3,000,000 | $28.00 | $84.0M | Indirect | Jun 22, 2020 (4d) |
| Nov 21, 2019 | ORBC | ↓ Sell | 21,100 | $3.99 | $84K | Indirect | Nov 22, 2019 (1d) |
| Nov 20, 2019 | ORBC | ↓ Sell | 112,901 | $4.04 | $456K | Indirect | Nov 22, 2019 (2d) |
| Oct 11, 2017 | ADXS | ↓ Sell | 600,000 | $4.30 | $2.6M | Indirect | Oct 12, 2017 (1d) |
| Sep 28, 2017 | CALA | ↓ Sell | 224,000 | $15.57 | $3.5M | Indirect | Sep 28, 2017 (0d) |
| Sep 26, 2017 | CALA | ↓ Sell | 352,000 | $15.68 | $5.5M | Indirect | Sep 28, 2017 (2d) |
| Sep 26, 2017 | ADXS | ↓ Sell | 705,323 | $4.22 | $3.0M | Indirect | Sep 26, 2017 (0d) |
| Sep 22, 2017 | ADXS | ↓ Sell | 534,000 | $4.68 | $2.5M | Indirect | Sep 26, 2017 (4d) |
| Jun 12, 2017 | PBYI | ↓ Sell | 157,722 | $79.99 | $12.6M | Indirect | Jun 12, 2017 (0d) |
| Jun 8, 2017 | PBYI | ↓ Sell | 89,538 | $80.88 | $7.2M | Indirect | Jun 12, 2017 (4d) |
| Jun 5, 2017 | PBYI | ↓ Sell | 342,803 | $90.44 | $31.0M | Indirect | Jun 5, 2017 (0d) |
| Jun 1, 2017 | PBYI | ↓ Sell | 164,325 | $82.41 | $13.5M | Indirect | Jun 5, 2017 (4d) |
| May 26, 2017 | PBYI | ↓ Sell | 1,185,700 | $75.68 | $89.7M | Indirect | May 26, 2017 (0d) |
| May 24, 2017 | PBYI | ↓ Sell | 50,000 | $68.13 | $3.4M | Indirect | May 26, 2017 (2d) |
| May 12, 2017 | SOI | ↑ Buy | 50,000 | $11.50 | $575K | Indirect | May 16, 2017 (4d) |
| May 12, 2017 | SOI | ↑ Buy | 25,000 | $11.49 | $287K | Indirect | May 16, 2017 (4d) |
| Mar 22, 2017 | CALA | ↑ Buy | 487,804 | $10.25 | $5.0M | Indirect | Mar 24, 2017 (2d) |
| Mar 17, 2017 | MULE | ↓ Sell | 25,000 | $25.06 | $627K | Indirect | Mar 21, 2017 (4d) |
| Nov 16, 2016 | CALA | ↑ Buy | 500,000 | $3.15 | $1.6M | Indirect | Nov 17, 2016 (1d) |
| Sep 14, 2016 | VTAE | ↓ Sell | 1,025,000 | $20.85 | $21.4M | Indirect | Sep 16, 2016 (2d) |
| Apr 6, 2016 | PSUN | ↓ Sell | 2,914,880 | $0.11 | $326K | Indirect | Apr 7, 2016 (1d) |
| Apr 5, 2016 | PSUN | ↓ Sell | 1,907,247 | $0.09 | $172K | Indirect | Apr 7, 2016 (2d) |
| Oct 15, 2015 | FPRX | ↓ Sell | 90,687 | $27.93 | $2.5M | Indirect | Oct 19, 2015 (4d) |
| Oct 15, 2015 | FPRX | ↓ Sell | 25,000 | $27.00 | $675K | See foonote | Oct 19, 2015 (4d) |
| Oct 15, 2015 | FPRX | ↓ Sell | 9,313 | $28.02 | $261K | Indirect | Oct 19, 2015 (4d) |
| Sep 23, 2015 | CALA | ↑ Buy | 81,968 | $6.04 | $495K | Indirect | Sep 24, 2015 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other PRAX insiders
Open-market trades in the last 12 months
About Robert Atchinson's insider trades
Robert Atchinson is a 10% owner of Praxis Precision Medicines (PRAX). Since Sep 7, 2007, Robert has reported 75 open-market purchases worth $275.2M and 66 sales worth $721.7M on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include shares returned to the company (8 filings), other transactions (4 filings), conversions (4 filings), option exercises (3 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every PRAX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.