21 institutions reported holding $538,063 of CARDIO DIAGNOSTICS HOLDGS IN (CDIO) in SEC 13F filings for 2026-03-31. Largest institutional holders: JANE STREET GROUP, LLC ($158,502), HRT FINANCIAL LP ($121,000), BlackRock, Inc. ($67,681), GEODE CAPITAL MANAGEMENT, LLC ($62,744), VANGUARD CAPITAL MANAGEMENT LLC ($39,302). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | JANE STREET GROUP, LLC | $158,502 | 81,283 | New |
| 2 | HRT FINANCIAL LP | $121,000 | 62,482 | New |
| 3 | BlackRock, Inc. | $67,681 | 34,708 | Trimmed |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | $62,744 | 32,177 | Added |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $39,302 | 20,155 | New |
| 6 | RENAISSANCE TECHNOLOGIES LLC | $29,929 | 15,348 | New |
| 7 | Scientech Research LLC | $27,066 | 13,880 | New |
| 8 | UBS Group AG | $19,343 | 9,919 | Added |
| 9 | VANGUARD FIDUCIARY TRUST CO | $7,740 | 3,969 | New |
| 10 | Tower Research Capital LLC (TRC) | $4,274 | 2,192 | Added |
| 11 | WOLVERINE ASSET MANAGEMENT LLC | $203 | 104 | Hold |
| 12 | MORGAN STANLEY | $195 | 100 | Hold |
| 13 | OSAIC HOLDINGS, INC. | $31 | 16 | Hold |
| 14 | SHP Wealth Management | $31 | 16 | Hold |
| 15 | SBI Securities Co., Ltd. | $20 | 10 | Trimmed |
| 16 | CITIGROUP INC | $2 | 1 | Trimmed |
| 17 | CITADEL ADVISORS LLC | $0 | 0 | Exited |
| 18 | DRW Securities, LLC | $0 | 0 | Exited |
| 19 | Arax Advisory Partners | $0 | 0 | Exited |
| 20 | BANK OF AMERICA CORP /DE/ | $0 | 0 | Exited |
| 21 | PNC Financial Services Group, Inc. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31