Insider · CIK 0001706400
Derrell Porter
Files at: ABOS, ATRA. On EDGAR ↗
Reported trades — common stock
| Trade | Reported (ET) | Company | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Jun 15, 2026 SForm 4 → | Jun 17, 5:10 pm EDT | Acumen Pharmaceuticals, Inc.ABOS | 32,300 | $2.33 | $75,240 | 35,500 | −47.6% | |
| Jun 15, 2026 MForm 4 → | Jun 17, 5:10 pm EDT | Acumen Pharmaceuticals, Inc.ABOS | 19,500 | $1.07 | $20,865 | 48,540 | — | |
| Jun 3, 2026 AForm 4 → | Jun 5, 4:30 pm EDT | Acumen Pharmaceuticals, Inc.ABOS | 35,500 | — | — | 48,300 | — | |
| Feb 15, 2019 SForm 4 → | Feb 19, 5:05 pm EST | Atara Biotherapeutics, Inc.ATRA | 5,909 | $40.00 | $236,360 | 21,688 | −21.4% | plan? |
| Feb 15, 2019 MForm 4 → | Feb 19, 5:05 pm EST | Atara Biotherapeutics, Inc.ATRA | 4,000 | $14.30 | $57,200 | 27,597 | — | plan? |
| Feb 6, 2019 AFForm 4 → | Feb 8, 4:23 pm EST | Atara Biotherapeutics, Inc.ATRA | 13,529 | $38.47 | $46,780 | 23,597 | — | plan? |
| May 15, 2018 SForm 4 → | May 16, 8:41 pm EDT | Atara Biotherapeutics, Inc.ATRA | 16,334 | $45.02 | $735,357 | 12,500 | −56.6% | plan? |
| May 15, 2018 MForm 4 → | May 16, 8:41 pm EDT | Atara Biotherapeutics, Inc.ATRA | 16,334 | $14.30 | $233,576 | 28,834 | — | plan? |
| May 8, 2018 SForm 4 → | May 8, 8:18 pm EDT | Atara Biotherapeutics, Inc.ATRA | 1,544 | $40.15 | $61,992 | 12,500 | −11.0% | plan? |
| Feb 6, 2018 AForm 4 → | Feb 8, 5:44 pm EST | Atara Biotherapeutics, Inc.ATRA | 12,500 | — | — | 14,044 | — | plan? |
Reported trades — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Company | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Jun 15, 2026 MForm 4 → | Jun 17, 5:10 pm EDT | Acumen Pharmaceuticals, Inc.ABOS | 19,500 | — | — | 0 | — | |
| Jun 3, 2026 AForm 4 → | Jun 5, 4:30 pm EDT | Acumen Pharmaceuticals, Inc.ABOS | 53,250 | — | — | 53,250 | — | |
| Feb 15, 2019 MForm 4 → | Feb 19, 5:05 pm EST | Atara Biotherapeutics, Inc.ATRA | 4,000 | — | — | 109,666 | — | |
| Feb 6, 2019 AForm 4 → | Feb 8, 4:23 pm EST | Atara Biotherapeutics, Inc.ATRA | 24,625 | — | — | 24,625 | — | |
| May 15, 2018 MForm 4 → | May 16, 8:41 pm EDT | Atara Biotherapeutics, Inc.ATRA | 16,334 | — | — | 113,666 | — | |
| Feb 6, 2018 AForm 4 → | Feb 8, 5:44 pm EST | Atara Biotherapeutics, Inc.ATRA | 25,000 | — | — | 25,000 | — | |
| May 10, 2017 AForm 4 → | May 11, 7:40 pm EDT | Atara Biotherapeutics, Inc.ATRA | 130,000 | — | — | 130,000 | — |