Spero Therapeutics, Inc.

Historical 13F Holders

Symbol
SPRO
CUSIP
84833T103
All holders as of
Q2 2026
Type
Equity
Class
COM
Reported Value, Excluding Options
Total Filings

13D/G Filers

Investors who own more than 5% of a class must file a Schedule 13D or 13G. Each filer's latest filing for 84833T103 since 12/18/2024, largest first.

Filer % of Class Filed
GSK plc 13D/A 16.4% 3/28/2025
Event 3/27/2025
Under 5%, checked the "5 percent or less" box, or amended by a later filing (1)
Anson Funds Management LP 13G/A
2.9% 8/14/2025
Event 6/30/2025

13F Holders by Quarter

Period Filings Shares, Excl. Options Value, Excl. Options
2026 Q3 1 10.0 $12.00
2026 Q2 66 21.5 M $47.5 M
2026 Q1 56 21.1 M $49.3 M
2025 Q4 58 21.1 M $49.2 M
2025 Q3 50 11.3 M $21.3 M
2025 Q2 48 11.1 M $32.1 M
2025 Q1 41 15.1 M $10.9 M
2024 Q4 55 16.1 M $16.5 M
2024 Q3 50 12.3 M $16.5 M
2024 Q2 53 13.9 M $18.0 M
2024 Q1 59 13.8 M $23.7 M
2023 Q4 53 13.8 M $143 M
2023 Q3 55 14.2 M $17.2 M
2023 Q2 59 14.4 M $20.8 M
2023 Q1 50 17.6 M $25.5 M
2022 Q4 64 14.3 M $24.8 M
2022 Q3 73 19.9 M $39.7 M
2022 Q2 82 21.0 M $15.5 M
2022 Q1 103 20.3 M $180 M
2021 Q4 93 19.9 M $318 M
2021 Q3 94 18.4 M $338 M
2021 Q2 96 17.5 M $246 M
2021 Q1 103 18.6 M $273 M
2020 Q4 102 19.4 M $376 M
2020 Q3 84 16.8 M $187 M
2020 Q2 84 11.8 M $159 M
2020 Q1 62 11.5 M $93.2 M
2019 Q4 63 10.9 M $105 M
2019 Q3 60 10.4 M $110 M
2019 Q2 62 10.6 M $122 M
2019 Q1 57 9.27 M $119 M
2018 Q4 54 9.19 M $56.6 M
2018 Q3 56 10.8 M $113 M
2018 Q2 45 8.13 M $119 M
2018 Q1 36 7.71 M $110 M
2017 Q4 37 7.76 M $91.2 M