IO Biotech, Inc. (IOBTQ) Shares Outstanding (Diluted) (2021 - 2025)
IO Biotech (IOBTQ) recorded Shares Outstanding (Diluted) of 66.94 million in Q3 2025, up 1.6% from 65.88 million a year earlier and up 1.6% from the prior quarter.
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Analysis
IO Biotech, Inc. (IOBTQ) Shares Outstanding (Diluted) (2021 - 2025) Analysis & Trends
For FY2024, IO Biotech reported Shares Outstanding (Diluted) of 65.88 million, up 51.3% from FY2023.
- Annual Shares Outstanding (Diluted) has increased for three straight years, with a three-year compound annual growth rate of 147.7% (FY2021 to FY2024).
- Across earlier years, Shares Outstanding (Diluted) came in at 43.54 million in FY2023 (+51.1%), 28.82 million in FY2022 (+564.6%) and 4.34 million in FY2021.
- The Q3 2025 figure is the highest quarterly Shares Outstanding (Diluted) in data going back to Q2 2021.
- On a year-over-year basis, Shares Outstanding (Diluted) rose in six of the last eight quarters, with growth averaging 49.1%.
- Over the past five years, the year-over-year growth in Shares Outstanding (Diluted) ranged from 0.0% (Q1 2023) to 564.6% (Q4 2022).
- Per Business Quant, the preceding three quarters came in at 65.88 million (Q2 2025), 65.88 million (Q1 2025) and 65.88 million (Q4 2024).
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Historic Data
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Historic Data
| Date | Value |
|---|---|
| Sep 30, 2025 | 66.94 Mn |
| Jun 30, 2025 | 65.88 Mn |
| Mar 31, 2025 | 65.88 Mn |
| Dec 31, 2024 | 65.88 Mn |
| Sep 30, 2024 | 65.88 Mn |
| Jun 30, 2024 | 65.88 Mn |
| Mar 31, 2024 | 65.88 Mn |
| Dec 31, 2023 | 43.54 Mn |
| Sep 30, 2023 | 50.17 Mn |
| Jun 30, 2023 | 28.82 Mn |
| Mar 31, 2023 | 28.82 Mn |
| Dec 31, 2022 | 28.82 Mn |
| Sep 30, 2022 | 28.82 Mn |
| Jun 30, 2022 | 28.82 Mn |
| Mar 31, 2022 | 28.82 Mn |
| Dec 31, 2021 | 4.34 Mn |
| Sep 30, 2021 | 177,200.00 |
| Jun 30, 2021 | 177,200.00 |
API Access
IO Biotech, Inc. Shares Outstanding (Diluted) API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=shares-outstanding-diluted&ticker=IOBTQ&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "shares-outstanding-diluted", "ticker": "IOBTQ", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=shares-outstanding-diluted&ticker=IOBTQ&period=max&api_key=YOUR_API_KEY");
const data = await res.json();