Cardio Diagnostics Holdings, Inc.
CDIO- Exchange
- Nasdaq
- Industry
- In Vitro & In Vivo Diagnostic Substances
- SEC CIK
- 0001870144
No open-market purchases or sales by Cardio Diagnostics Holdings, Inc. insiders were filed in the last 90 days; 17 institutions reported holding it in 13F filings for Q2 2026, worth $422.7K in total; no superinvestor holds it.
Other share classesCDIOW
13F holders, Q1 2026
Institutional positions in Cardio Diagnostics Holdings, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 16
- +1 vs. Q4 2025
- Shares held
- 276.4K
- +170.9K (+162.2%) vs. Q4 2025
- Total value
- $538.1K
- +$252.4K (+88.4%) vs. Q4 2025
- New holders
- 6
- 3 more added
- Sold out
- 5
- 3 more reduced
1 institution that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CDIO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 17 | $422.7K |
| Q1 2026 | 16 | $538.1K |
| Q4 2025 | 16 | $351.0K |
| Q3 2025 | 14 | $462.2K |
| Q2 2025 | 16 | $332.0K |
| Q1 2025 | 23 | $836.3K |
| Q4 2024 | 23 | $2.36M |
| Q3 2024 | 15 | $373.7K |
| Q2 2024 | 16 | $996.1K |
| Q1 2024 | 14 | $2.30M |
| Q4 2023 | 14 | $4.12M |
| Q3 2023 | 15 | $152.4K |
| Q2 2023 | 10 | $445.3K |
| Q1 2023 | 11 | $1.31M |
| Q4 2022 | 12 | $248.8K |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Cardio Diagnostics Holdings, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Jane Street Group, LLC | 81,283 | $158.5K | 0.00% | +81,283 | New |
| HRT Financial LP | 62,482 | $121.0K | 0.00% | +62,482 | New |
| BlackRock, Inc. | 34,708 | $67.7K | 0.00% | −859−2.4% | Reduced |
| Geode Capital Management, LLC | 32,177 | $62.7K | 0.00% | +17,042+112.6% | Added |
| Vanguard Capital Management LLC | 20,155 | $39.3K | 0.00% | +20,155 | New |
| Renaissance Technologies LLC | 15,348 | $29.9K | 0.00% | +15,348 | New |
| Scientech Research LLC | 13,880 | $27.1K | 0.02% | +13,880 | New |
| UBS Group AG | 9,919 | $19.3K | 0.00% | +8,967+941.9% | Added |
| Vanguard Fiduciary Trust Co | 3,969 | $7.74K | 0.00% | +3,969 | New |
| Tower Research Capital LLC (TRC) | 2,192 | $4.27K | 0.00% | +1,415+182.1% | Added |
| Wolverine Asset Management LLC | 104 | $203 | 0.00% | 00.0% | Unchanged |
| Morgan Stanley | 100 | $195 | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 16 | $31 | 0.00% | 00.0% | Unchanged |
| SHP Wealth Management | 16 | $31 | 0.00% | 00.0% | Unchanged |
| SBI Securities Co., Ltd. | 10 | $20 | 0.00% | −16−61.5% | Reduced |
| Citigroup Inc | 1 | $2 | 0.00% | −25−96.2% | Reduced |
| DRW Securities, LLC | 0 | $0 | 0.00% | −40,463−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −10,858−100.0% | Sold out |
| The PNC Financial Services Group, Inc. | 0 | $0 | 0.00% | −1,350−100.0% | Sold out |
| Bank of America Corp | 0 | $0 | 0.00% | −16−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −6−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |