ATRA · Atara Biotherapeutics, Inc.
Substantial doubt about the company's ability to continue as a going concern.
“Accordingly, we have concluded that substantial doubt exists with respect to our ability to continue as a going concern for at least 12 months after the issuance of the accompanying condensed consolidated financial statements.”View the 10-Q filed May 12, 2026
Total shares sold short and not yet covered, reported to FINRA by broker-dealers twice a month. Each reading settles on the 15th and the last business day of the month and is published seven business days later — the next scheduled dates are listed at the top of the table. Days to cover divides the short position by average daily volume; a high value (above 5) can signal short-squeeze potential.
Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-07-15). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.
Short Interest History
| Settlement Date | Current Position | Previous Position | Change | Days to Cover |
|---|---|---|---|---|
|
2026-08-14
Scheduled
FINRA publishes Aug 25
|
— | — | — | — |
|
2026-07-31
Scheduled
FINRA publishes Aug 11
|
— | — | — | — |
| 2026-07-15 | 577,635 | 361,520 | +216,115 | 6.24 |
| 2026-06-30 | 361,520 | 492,405 | -130,885 | 3.95 |
| 2026-06-15 | 492,405 | 484,391 | +8,014 | 6.27 |
| 2026-05-29 | 484,391 | 546,470 | -62,079 | 2.91 |
| 2026-05-15 | 546,470 | 306,093 | +240,377 | 1.00 |
| 2026-04-30 | 306,093 | 317,953 | -11,860 | 6.10 |
| 2026-04-15 | 317,953 | 327,066 | -9,113 | 4.10 |
| 2026-03-31 | 327,066 | 313,290 | +13,776 | 3.01 |
| 2026-03-13 | 313,290 | 330,524 | -17,234 | 1.00 |
| 2026-02-27 | 330,524 | 209,287 | +121,237 | 2.13 |
| 2026-02-13 | 209,287 | 282,525 | -73,238 | 2.40 |
| 2026-01-30 | 282,525 | 1,016,616 | -734,091 | 1.00 |
| 2026-01-15 | 1,016,616 | 169,201 | +847,415 | 1.00 |
| 2025-12-31 | 169,201 | 166,856 | +2,345 | 2.56 |
| 2025-12-15 | 166,856 | 164,713 | +2,143 | 2.01 |
| 2025-11-28 | 164,713 | 176,777 | -12,064 | 2.79 |
| 2025-11-14 | 176,777 | 168,549 | +8,228 | 2.37 |
| 2025-10-31 | 168,549 | 128,849 | +39,700 | 3.72 |
| 2025-10-15 | 128,849 | 149,590 | -20,741 | 2.11 |
| 2025-09-30 | 149,590 | 161,507 | -11,917 | 2.51 |
| 2025-09-15 | 161,507 | 173,825 | -12,318 | 3.51 |
| 2025-08-29 | 173,825 | 196,215 | -22,390 | 3.16 |
| 2025-08-15 | 196,215 | 210,641 | -14,426 | 4.39 |
| 2025-07-31 | 210,641 | 268,036 | -57,395 | 2.45 |