SPRO

Spero Therapeutics, Inc.

Company with tickers: SPRO

CIK
1701108
CUSIP
84833T103
Shares Outstanding
57,891,493

Short Interest History

Settlement Date Current Position Previous Position Change Days to Cover
2026-03-13 537,411 574,027 -36,616 1.72
2026-02-27 574,027 715,694 -141,667 2.12
2026-02-13 715,694 941,659 -225,965 1.68
2026-01-30 941,659 1,039,613 -97,954 4.01
2026-01-15 1,039,613 946,767 +92,846 4.43
2025-12-31 946,767 1,056,013 -109,246 3.85
2025-12-15 1,056,013 825,698 +230,315 3.51
2025-11-28 825,698 615,735 +209,963 2.14
2025-11-14 615,735 476,137 +139,598 1.05
2025-10-31 476,137 315,715 +160,422 1.00
2025-10-15 315,715 549,473 -233,758 1.00
2025-09-30 549,473 458,620 +90,853 2.06
2025-09-15 458,620 503,998 -45,378 1.32
2025-08-29 503,998 927,158 -423,160 1.35
2025-08-15 927,158 1,379,953 -452,795 1.00
2025-07-31 1,379,953 1,217,101 +162,852 2.25
2025-07-15 1,217,101 1,697,497 -480,396 1.22
2025-06-30 1,697,497 1,612,678 +84,819 1.24
2025-06-13 1,612,678 3,476,335 -1,863,657 1.00
2025-05-30 3,476,335 636,730 +2,839,605 1.00
2025-05-15 636,730 645,163 -8,433 5.63
2025-04-30 645,163 801,304 -156,141 8.23
2025-04-15 801,304 498,066 +303,238 3.22
2025-03-31 498,066 437,248 +60,818 3.45