ATRA short interest
Atara Biotherapeutics Inc. · Healthcare · Biotechnology · settlement date 2026-09-30
| Shares short | 321,792 |
|---|---|
| Change vs prior report | -82,478 (-20.4%) |
| Change over six months | -1.6% |
| Days to cover | 8.11 (sector: 3.78) |
| Average daily volume | 39,657 |
| Rank in Healthcare | not ranked (OTC, fund or thinly traded) |
ATRA short interest, last 12 months
| Settlement | Shares short | Change | Days to cover | Avg daily volume |
|---|---|---|---|---|
| 2026-09-30 | 321,792 | -20.4% | 8.11 | 39,657 |
| 2026-09-15 | 404,270 | -5.4% | 7.34 | 55,057 |
| 2026-08-31 | 427,435 | -10.4% | 11.07 | 38,619 |
| 2026-08-14 | 477,268 | -11.1% | 9.21 | 51,842 |
| 2026-07-31 | 536,897 | -7.0% | 9.39 | 57,166 |
| 2026-07-15 | 577,635 | +59.8% | 6.24 | 92,530 |
| 2026-06-30 | 361,520 | -26.6% | 3.95 | 91,505 |
| 2026-06-15 | 492,405 | +1.6% | 6.27 | 78,554 |
| 2026-05-29 | 484,391 | -11.4% | 2.91 | 166,237 |
| 2026-05-15 | 546,470 | +78.5% | 1.00 | 7,386,437 |
| 2026-04-30 | 306,093 | -3.7% | 6.10 | 50,142 |
| 2026-04-15 | 317,953 | -2.8% | 4.10 | 77,634 |
| 2026-03-31 | 327,066 | +4.4% | 3.01 | 108,635 |
| 2026-03-13 | 313,290 | -5.2% | 1.00 | 864,901 |
| 2026-02-27 | 330,524 | +57.9% | 2.13 | 155,018 |
| 2026-02-13 | 209,287 | -25.9% | 2.40 | 87,228 |
| 2026-01-30 | 282,525 | -72.2% | 1.00 | 351,029 |
| 2026-01-15 | 1,016,616 | +500.8% | 1.00 | 1,101,087 |
| 2025-12-31 | 169,201 | +1.4% | 2.56 | 66,178 |
| 2025-12-15 | 166,856 | +1.3% | 2.01 | 82,905 |
| 2025-11-28 | 164,713 | -6.8% | 2.79 | 58,956 |
| 2025-11-14 | 176,777 | +4.9% | 2.37 | 74,588 |
| 2025-10-31 | 168,549 | +30.8% | 3.72 | 45,357 |
| 2025-10-15 | 128,849 | -13.9% | 2.11 | 61,142 |
| 2025-09-30 | 149,590 | -7.4% | 2.51 | 59,707 |
import finzdata as yf
yf.Ticker("ATRA").short_interest # every report since 2017
yf.Client().short_interest(["ATRA"], start="2018-01-01")Healthcare short interest · ATRA price history · Who owns ATRA · All short interest