ATYR Short Interest (April 15, 2026 Update)
Short interest for ATYR was 19.9M as of April 15, 2026, +1.4% from the prior report.
This page tracks ATYR short interest over time, including historical values, changes between reports, and days to cover.
aTyr Pharma, Inc. Common Stock | ATYR | R | Latest report: April 15, 2026
At the latest settlement date of April 15, 2026, aTyr Pharma, Inc. Common Stock (ATYR) showed reported short interest of 19,884,135 shares. That compared with 19,617,163 shares in the prior report, a change of 267.0K shares, or +1.4%. The latest reported days to cover was 21.16, based on average daily volume of 939.9K.
The historical data currently tracked for ATYR includes 43 reported entries from June 14, 2024 to April 15, 2026. The table below shows each reported settlement date currently included for this symbol.
Extreme edge-case readings may reflect unusually low reported average volume.
| Settlement Date | Short Interest | Prior Short Interest | Change Shares | Change % | Average Daily Volume | Days to Cover |
|---|---|---|---|---|---|---|
| April 15, 2026 | 19,884,135 | 19,617,163 | 267.0K | +1.4% | 939.9K | 21.16 |
| March 31, 2026 | 19,617,163 | 18,967,502 | 649.7K | +3.4% | 1.0M | 19.59 |
| March 13, 2026 | 18,967,502 | 18,802,360 | 165.1K | +0.9% | 1.2M | 16.15 |
| February 27, 2026 | 18,802,360 | 19,877,366 | -1.1M | -5.4% | 1.6M | 11.6 |
| February 13, 2026 | 19,877,366 | 20,432,971 | -555.6K | -2.7% | 2.4M | 8.42 |
| January 30, 2026 | 20,432,971 | 21,334,051 | -901.1K | -4.2% | 2.6M | 7.72 |
| January 15, 2026 | 21,334,051 | 25,013,857 | -3.7M | -14.7% | 1.5M | 14.17 |
| December 31, 2025 | 25,013,857 | 30,385,566 | -5.4M | -17.7% | 2.2M | 11.13 |
| December 15, 2025 | 30,385,566 | 29,801,092 | 584.5K | +2.0% | 2.0M | 15.47 |
| November 28, 2025 | 29,801,092 | 29,864,642 | -63.5K | -0.2% | 3.2M | 9.24 |
| November 14, 2025 | 29,864,642 | 31,060,738 | -1.2M | -3.9% | 3.9M | 7.62 |
| October 31, 2025 | 31,060,738 | 36,142,593 | -5.1M | -14.1% | 5.1M | 6.08 |
| October 15, 2025 | 36,142,593 | 37,932,369 | -1.8M | -4.7% | 10.7M | 3.39 |
| September 15, 2025 | 33,089,093 | 29,405,110 | 3.7M | +12.5% | 21.0M | 1.58 |
| August 29, 2025 | 29,405,110 | 28,245,132 | 1.2M | +4.1% | 3.7M | 8.04 |
| August 15, 2025 | 28,245,132 | 25,598,382 | 2.6M | +10.3% | 3.9M | 7.17 |
| July 31, 2025 | 25,598,382 | 20,381,870 | 5.2M | +25.6% | 7.5M | 3.42 |
| July 15, 2025 | 20,381,870 | 18,464,705 | 1.9M | +10.4% | 3.5M | 5.82 |
| June 30, 2025 | 18,464,705 | 13,644,953 | 4.8M | +35.3% | 4.2M | 4.4 |
| June 13, 2025 | 13,644,953 | 13,770,149 | -125.2K | -0.9% | 2.9M | 4.65 |
| May 30, 2025 | 13,770,149 | 12,681,301 | 1.1M | +8.6% | 1.7M | 8.24 |
| May 15, 2025 | 12,681,301 | 11,691,227 | 990.1K | +8.5% | 1.2M | 10.42 |
| April 30, 2025 | 11,691,227 | 10,025,170 | 1.7M | +16.6% | 1.1M | 10.96 |
| April 15, 2025 | 10,025,170 | 8,322,026 | 1.7M | +20.5% | 1.5M | 6.64 |
| March 31, 2025 | 8,322,026 | 6,920,509 | 1.4M | +20.3% | 1.3M | 6.35 |
| February 28, 2025 | 5,259,028 | 4,354,940 | 904.1K | +20.8% | 2.0M | 2.58 |
| February 14, 2025 | 4,354,940 | 3,816,730 | 538.2K | +14.1% | 818.4K | 5.32 |
| January 31, 2025 | 3,816,730 | 3,515,857 | 300.9K | +8.6% | 641.7K | 5.95 |
| January 15, 2025 | 3,515,857 | 3,647,026 | -131.2K | -3.6% | 990.1K | 3.55 |
| December 31, 2024 | 3,647,026 | 2,920,070 | 727.0K | +24.9% | 958.8K | 3.8 |
| December 13, 2024 | 2,920,070 | 2,173,825 | 746.2K | +34.3% | 674.7K | 4.33 |
| November 29, 2024 | 2,173,825 | 2,114,376 | 59.4K | +2.8% | 793.0K | 2.74 |
| November 15, 2024 | 2,114,376 | 1,662,000 | 452.4K | +27.2% | 806.1K | 2.62 |
| October 31, 2024 | 1,662,000 | 1,065,364 | 596.6K | +56.0% | 1.3M | 1.24 |
| October 15, 2024 | 1,065,364 | 1,364,879 | -299.5K | -21.9% | 1.5M | 1 |
| September 30, 2024 | 1,364,879 | 685,779 | 679.1K | +99.0% | 314.3K | 4.34 |
| September 13, 2024 | 685,779 | 440,872 | 244.9K | +55.6% | 375.0K | 1.83 |
| August 30, 2024 | 440,872 | 346,758 | 94.1K | +27.1% | 259.9K | 1.7 |
| August 15, 2024 | 346,758 | 270,552 | 76.2K | +28.2% | 321.6K | 1.08 |
| July 31, 2024 | 270,552 | 336,586 | -66.0K | -19.6% | 591.3K | 1 |
| July 15, 2024 | 336,586 | 392,479 | -55.9K | -14.2% | 209.7K | 1.6 |
| June 28, 2024 | 392,479 | 276,520 | 116.0K | +41.9% | 476.8K | 1 |
| June 14, 2024 | 276,520 | 351,203 | -74.7K | -21.3% | 363.3K | 1 |