RARE
Ultragenyx Pharmaceutical Inc.
stockNASDAQ
At CloseOct 2, 2026 3:59:58 PM EDT
15.21USD+3.119%(+0.46)3,880,768
Pre-marketOct 2, 2026 9:26:30 AM EDT
14.80USD+0.339%(+0.05)
After-hoursOct 2, 2026 4:27:30 PM EDT
15.33USD+0.789%(+0.12)
As of 2026-09-15, there were 16,571,956 shares short with a short interest of 17.52%.
RARE Short Interest - Official
Short Interest
RARE Short Position Change - Official
Short Position Change
RARE Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | 17.52 | 16,571,956 | 2.22 | -572,398 | -3.34 | 98,588,873 | 94,605,317 |
| 2026-08-31 | 18.12 | 17,144,354 | 8.00 | +1,256,587 | +7.91 | 98,588,873 | 94,605,317 |
| 2026-08-14 | 16.79 | 15,887,767 | 7.78 | +924,371 | +6.18 | 98,588,873 | 94,605,317 |
| 2026-07-31 | 15.82 | 14,963,396 | 8.28 | +1,528,309 | +11.38 | 98,489,224 | 94,605,317 |
| 2026-07-15 | 14.22 | 13,435,087 | 6.94 | -2,782,066 | -17.16 | 98,489,224 | 94,509,092 |
| 2026-06-30 | 17.16 | 16,217,153 | 3.60 | +1,904,394 | +13.31 | 98,489,224 | 94,504,182 |
| 2026-06-15 | 15.15 | 14,312,759 | 8.85 | +336,441 | +2.41 | 98,489,224 | 94,501,237 |
| 2026-05-15 | 15.04 | 13,976,318 | 8.22 | +310,506 | +2.27 | 98,489,224 | 92,899,937 |
| 2026-04-30 | 14.71 | 13,665,812 | 8.40 | +1,577,317 | +13.05 | 98,317,221 | 92,894,391 |
| 2026-04-15 | 13.01 | 12,088,495 | 7.09 | +674,816 | +5.91 | 98,317,221 | 92,894,391 |
| 2026-03-31 | 12.29 | 11,413,679 | 4.81 | +1,481,607 | +14.92 | 98,317,221 | 92,894,391 |
| 2026-03-13 | 10.69 | 9,932,072 | 4.78 | +334,931 | +3.49 | 96,629,788 | 92,894,391 |
| 2026-02-27 | 10.33 | 9,597,141 | 5.40 | -264,329 | -2.68 | 96,629,788 | 92,894,391 |
| 2026-02-13 | 10.62 | 9,861,470 | 3.92 | +765,567 | +8.42 | 96,477,569 | 92,894,391 |
| 2026-01-30 | 9.79 | 9,095,903 | 3.85 | +234,247 | +2.64 | 96,477,569 | 92,894,391 |
| 2026-01-15 | 9.54 | 8,861,656 | 2.72 | +844,257 | +10.53 | 96,477,569 | 92,894,391 |
| 2025-12-31 | 8.63 | 8,017,399 | 1.88 | -583,178 | -6.78 | 96,477,569 | 92,894,391 |
| 2025-12-15 | 9.26 | 8,600,577 | 5.66 | -270,961 | -3.05 | 96,477,569 | 92,894,391 |
| 2025-11-28 | 9.55 | 8,871,538 | 7.17 | +1,042,585 | +13.32 | 96,477,569 | 92,891,502 |
| 2025-11-14 | 8.43 | 7,828,953 | 5.33 | +684,153 | +9.58 | 96,477,569 | 92,889,576 |
| 2025-10-31 | 7.70 | 7,144,800 | 5.63 | -1,548,147 | -17.81 | 96,371,643 | 92,783,558 |
| 2025-10-15 | 9.37 | 8,692,947 | 6.16 | +1,038,358 | +13.57 | 96,371,643 | 92,796,064 |
Historical data is split-adjusted.
1 Data from Finra. Finra publishes an updated file every two weeks.
2 Days to Cover (DTC) is also called Short Ratio. This is the Short Position / Average Daily Trading Volume.