ZBIO
Zenas BioPharma, Inc. Common Stock
stockNASDAQ
Market OpenOct 5, 2026 11:57:56 AM EDT
28.12USD-0.601%(-0.17)128,252
27.61Bid28.25Ask0.64SpreadAs of 2026-09-15, there were 11,871,346 shares short with a short interest of 80.21%.
ZBIO Short Interest - Official
Short Interest
ZBIO Short Position Change - Official
Short Position Change
ZBIO 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 | 80.21 | 11,871,346 | 22.43 | +169,058 | +1.44 | 65,176,723 | 14,799,443 |
| 2026-08-31 | 79.07 | 11,702,288 | 14.18 | +43,302 | +0.37 | 65,176,723 | 14,799,443 |
| 2026-08-14 | 78.78 | 11,658,986 | 21.06 | -94,580 | -0.80 | 65,176,723 | 14,799,443 |
| 2026-07-31 | 79.42 | 11,753,566 | 13.83 | -416,341 | -3.42 | 63,133,377 | 14,799,443 |
| 2026-07-15 | 116.29 | 12,169,907 | 12.46 | -26,529 | -0.22 | 63,133,377 | 10,464,978 |
| 2026-06-30 | 116.55 | 12,196,436 | 9.64 | +1,064,697 | +9.56 | 63,133,377 | 10,464,978 |
| 2026-06-15 | 106.37 | 11,131,739 | 19.33 | +444,453 | +4.16 | 63,133,377 | 10,464,978 |
| 2026-05-15 | 102.12 | 10,687,286 | 21.31 | -166,388 | -1.53 | 63,133,377 | 10,464,978 |
| 2026-04-30 | 110.51 | 10,853,674 | 23.97 | +630,044 | +6.16 | 62,371,044 | 9,821,879 |
| 2026-04-15 | 104.09 | 10,223,630 | 12.37 | +861,523 | +9.20 | 62,361,260 | 9,821,879 |
| 2026-03-31 | 95.32 | 9,362,107 | 7.48 | +1,652,284 | +21.43 | 57,371,044 | 9,821,879 |
| 2026-03-13 | 78.50 | 7,709,823 | 22.25 | -313,889 | -3.91 | 53,679,166 | 9,821,879 |
| 2026-02-27 | 81.69 | 8,023,712 | 10.70 | +222,432 | +2.85 | 53,679,166 | 9,821,879 |
| 2026-02-13 | 79.43 | 7,801,280 | 8.41 | +1,232,535 | +18.76 | 53,679,166 | 9,821,879 |
| 2026-01-30 | 66.88 | 6,568,745 | 11.32 | +481,905 | +7.92 | 53,679,166 | 9,821,879 |
| 2026-01-15 | 61.97 | 6,086,840 | 3.01 | +1,307,467 | +27.36 | 53,679,166 | 9,821,879 |
| 2025-12-31 | 48.66 | 4,779,373 | 11.90 | -171,493 | -3.46 | 53,679,166 | 9,821,879 |
| 2025-12-15 | 50.41 | 4,950,866 | 17.31 | +91,957 | +1.89 | 53,679,166 | 9,821,879 |
| 2025-11-28 | 49.47 | 4,858,909 | 14.36 | +251,128 | +5.45 | 53,679,166 | 9,821,879 |
| 2025-11-14 | 46.91 | 4,607,781 | 12.34 | -159,068 | -3.34 | 53,679,166 | 9,821,879 |
| 2025-10-31 | 48.29 | 4,766,849 | 6.79 | +430,601 | +9.93 | 47,110,313 | 9,870,699 |
| 2025-10-15 | 42.21 | 4,336,248 | 9.85 | -1,280,330 | -22.80 | 47,110,313 | 10,273,274 |
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.