RARE
Ultragenyx Pharmaceutical Inc.
$33.82
-0.79 (-2.28%)
At close · Jul 10
Market Cap
$3.33B
Shares
98,489,224
Total shares sold short and not yet covered, reported to FINRA by broker-dealers and published twice a month (bi-monthly). Days to cover divides the short position by average daily volume; a high value (above 5) can signal short-squeeze potential.
Short Squeeze Score
75/100
Short interest 16.5% of shares — P96
Days to cover 3.6 — P67
Price vs VWAP +23.5% — P96
Short-volume trend -11.3% — P17
Short interest change +13.3% — P71
Worst FTD 0.24% of shares — P88
Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-06-30). 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 |
|---|---|---|---|---|
| 2026-06-30 | 16,217,153 | 14,312,759 | +1,904,394 | 3.60 |
| 2026-06-15 | 14,312,759 | 14,703,432 | -390,673 | 8.85 |
| 2026-05-29 | 14,703,432 | 13,976,318 | +727,114 | 9.83 |
| 2026-05-15 | 13,976,318 | 13,665,812 | +310,506 | 8.22 |
| 2026-04-30 | 13,665,812 | 12,088,495 | +1,577,317 | 8.40 |
| 2026-04-15 | 12,088,495 | 11,413,679 | +674,816 | 7.09 |
| 2026-03-31 | 11,413,679 | 9,932,072 | +1,481,607 | 4.81 |
| 2026-03-13 | 9,932,072 | 9,597,141 | +334,931 | 4.78 |
| 2026-02-27 | 9,597,141 | 9,861,470 | -264,329 | 5.40 |
| 2026-02-13 | 9,861,470 | 9,095,903 | +765,567 | 3.92 |
| 2026-01-30 | 9,095,903 | 8,861,656 | +234,247 | 3.85 |
| 2026-01-15 | 8,861,656 | 8,017,399 | +844,257 | 2.72 |
| 2025-12-31 | 8,017,399 | 8,600,577 | -583,178 | 1.88 |
| 2025-12-15 | 8,600,577 | 8,871,538 | -270,961 | 5.66 |
| 2025-11-28 | 8,871,538 | 7,828,953 | +1,042,585 | 7.17 |
| 2025-11-14 | 7,828,953 | 7,144,800 | +684,153 | 5.33 |
| 2025-10-31 | 7,144,800 | 8,692,947 | -1,548,147 | 5.63 |
| 2025-10-15 | 8,692,947 | 7,654,589 | +1,038,358 | 6.16 |
| 2025-09-30 | 7,654,589 | 7,947,955 | -293,366 | 3.89 |
| 2025-09-15 | 7,947,955 | 8,320,958 | -373,003 | 5.15 |
| 2025-08-29 | 8,320,958 | 8,405,280 | -84,322 | 6.78 |
| 2025-08-15 | 8,405,280 | 7,638,230 | +767,050 | 4.85 |
| 2025-07-31 | 7,638,230 | 8,801,643 | -1,163,413 | 2.97 |
| 2025-07-15 | 8,801,643 | 6,820,252 | +1,981,391 | 2.49 |
Showing 1–24 of 24 settlements
Key facts
CIK
1515673
CUSIP
90400D108
13F (30d)
13 filings
12 filers
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