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SPRO - Spero Therapeutics Inc (SPRO) has a shares outstanding of 59.37M, up 9.9% over the past year.
Shares Outstanding
59.37M
Dilution %
+798.86%
Annual Change
+9.86%
| Year | Shares | Change |
|---|---|---|
| 2025 | 59.37M | +9.86% |
| 2024 | 54.04M | +1.75% |
| 2023 | 53.11M | +9.02% |
| 2022 | 48.72M | +51.61% |
| 2021 | 32.13M | +17.40% |
| 2020 | 27.37M | +43.65% |
| 2019 | 19.05M | +7.42% |
| 2018 | 17.74M | +32.39% |
| 2017 | 13.40M | +102.85% |
| 2016 | 6.60M | - |
| Quarter | Shares | Change |
|---|---|---|
| Q4 2025 | 59.37M | +5.49% |
| Q3 2025 | 56.28M | +0.45% |
| Q2 2025 | 56.03M | +1.17% |
| Q1 2025 | 55.38M | +2.48% |
| Q4 2024 | 54.04M | -0.16% |
| Q3 2024 | 54.12M | +0.31% |
| Q2 2024 | 53.96M | +0.81% |
| Q1 2024 | 53.52M | +0.78% |
| Q4 2023 | 53.11M | +0.76% |
| Q3 2023 | 52.71M | +0.26% |
| Q2 2023 | 52.57M | +0.09% |
| Q1 2023 | 52.53M | +7.82% |
| Q4 2022 | 48.72M | +35.77% |
| Q3 2022 | 35.88M | +8.81% |
| Q2 2022 | 32.98M | +1.14% |
| Q1 2022 | 32.61M | +1.48% |
| Q4 2021 | 32.13M | +0.00% |
| Q3 2021 | 32.13M | +8.28% |
| Q2 2021 | 29.68M | +0.89% |
| Q1 2021 | 29.41M | +7.47% |
| Q4 2020 | 27.37M | +24.78% |
| Q3 2020 | 21.93M | +6.30% |
| Q2 2020 | 20.63M | +5.50% |
| Q1 2020 | 19.56M | +2.65% |
| Q4 2019 | 19.05M | +2.11% |
| Q3 2019 | 18.66M | +5.61% |
| Q2 2019 | 17.67M | +2.59% |
| Q1 2019 | 17.22M | -2.91% |
| Q4 2018 | 17.74M | +1.52% |
| Q3 2018 | 17.47M | +21.53% |
| Q2 2018 | 14.38M | +0.05% |
| Q1 2018 | 14.37M | +7.25% |
| Q4 2017 | 13.40M | +0.00% |
| Q3 2017 | 13.40M | +102.85% |
| Q2 2017 | 6.60M | +0.00% |
| Q1 2017 | 6.60M | +0.00% |
| Q4 2016 | 6.60M | +0.00% |
| Q3 2016 | 6.60M | +0.00% |
| Q2 2016 | 6.60M | - |
| Q4 2015 | - | - |
Shares outstanding is the total number of a company's shares currently held by all its shareholders. A shrinking share count usually reflects buybacks that raise each remaining share's claim on earnings, while a rising count can signal dilution.