Institutional Ownership
Spero Therapeutics Inc
CUSIP 84833T103COMSPROQ1 2026
Shares Short
2.11M
As of Jul 15, 2026
Days to Cover
1.28
Short shares ÷ avg daily volume
Change vs Prior
-26.2%
vs previous settlement
Avg Daily Volume
1.65M
FINRA reported ADV
Short Interest History
17 settlements on record · FINRA consolidated
Higher short interest is bearish: increases show red, decreases green.
| Settlement | Shares Short | Prior | Change | Avg Daily Vol | Days to Cover |
|---|---|---|---|---|---|
| Jul 15, 2026 | 2.11M | 2.86M | -26.2% | 1.65M | 1.28 |
| Jun 30, 2026 | 2.86M | 1.83M | +56.4% | 2.75M | 1.04 |
| Jun 15, 2026 | 1.83M | 1.71M | +7.3% | 813.4K | 2.25 |
| May 29, 2026 | 1.71M | 1.65M | +3.6% | 868.9K | 1.96 |
| May 15, 2026 | 1.65M | 1.18M | +39.6% | 630.5K | 2.61 |
| Apr 30, 2026 | 1.18M | 737.7K | +59.9% | 385.4K | 3.06 |
| Apr 15, 2026 | 737.7K | 605.3K | +21.9% | 531.2K | 1.39 |
| Mar 31, 2026 | 605.3K | 537.4K | +12.6% | 325.6K | 1.86 |
| Mar 13, 2026 | 537.4K | 574.0K | -6.4% | 312.9K | 1.72 |
| Feb 27, 2026 | 574.0K | 715.7K | -19.8% | 270.6K | 2.12 |
| Feb 13, 2026 | 715.7K | 941.7K | -24.0% | 427.0K | 1.68 |
| Jan 30, 2026 | 941.7K | 1.04M | -9.4% | 234.7K | 4.01 |