Cardio Diagnostics Holdings, Inc.
Cardio Diagnostics Holdings, Inc. (CDIO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · CDIO · as of Sep 30, 2025
Ownership Breakdown
13
Institutional Holders
▼ 2 vs Q2
$462,227
Total Inst. Value
▲ $157,217 vs Q2
2.07M
Shares Outstanding
freeFloat 93.21%
114,976
13F Shares Held
▲ 30,250 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
CDIO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. in vitro & in vivo diagnostic substances | 35.6K | 2.02% | 2.02% | $142.62M | Nov 12, 2025 | — held |
VANGUARD GROUP INC in vitro & in vivo diagnostic substances | 24.1K | 1.37% | 1.37% | $97.22M | Nov 7, 2025 | ▲ 11.4K |
CITADEL ADVISORS LLC in vitro & in vivo diagnostic substances | 19.5K | 1.11% | 1.11% | $78.67M | Nov 14, 2025 | NEW |
DRW SECURITIES, LLC in vitro & in vivo diagnostic substances | 18.2K | 1.03% | 1.03% | $72.84M | Nov 14, 2025 | NEW |
GEODE CAPITAL MANAGEMENT, LLC in vitro & in vivo diagnostic substances | 15.1K | 85.89% | 85.89% | $60.84M | Nov 12, 2025 | ▲ 1.7K |
PNC FINANCIAL SERVICES GROUP, INC. in vitro & in vivo diagnostic substances | 1.4K | 7.68% | 7.68% | $5.41M | Nov 7, 2025 | — held |
TOWER RESEARCH CAPITAL LLC (TRC) in vitro & in vivo diagnostic substances | 788 | 4.48% | 4.48% | $3.16M | Nov 14, 2025 | ▲ 688 |
MORGAN STANLEY in vitro & in vivo diagnostic substances | 123 | 0.70% | 0.70% | $493,000 | May 27, 2026 | ▲ 23 |
WOLVERINE ASSET MANAGEMENT LLC in vitro & in vivo diagnostic substances | 104 | 0.59% | 0.59% | $417,000 | Oct 28, 2025 | — held |
ADVISOR GROUP HOLDINGS, INC. in vitro & in vivo diagnostic substances | 89 | 0.51% | 0.51% | $356,000 | Nov 14, 2025 | ▼ 18 |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
4
Increased
+13.9K shares2
New Positions
first time holders2
Decreased
−61 shares5
Sold Out
fully exitedNet shares change (top 50)
+13.8K
+13.9K / −61
Net new holders
-1
2 new / 5 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
CDIO insider trading · insider activity
Source: SEC Form 4
4
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Fung Peter K director | Mar 31, 2026 | Award | 3,205 | $1.95 | $6.2K | 9.5K | Form 4 ↗ |
Betts Wendy J director | Mar 31, 2026 | Award | 3,205 | $1.95 | $6.2K | 9.5K | Form 4 ↗ |
Intrater James director | Mar 31, 2026 | Award | 3,205 | $1.95 | $6.2K | 10.5K | Form 4 ↗ |
Burton Paul Frederick director | Mar 31, 2026 | Award | 3,205 | $1.95 | $6.2K | 10.5K | Form 4 ↗ |
Fung Peter K director | Dec 31, 2025 | Award | 2,306 | $2.71 | $6.2K | 6.3K | Form 4 ↗ |
Betts Wendy J director | Dec 31, 2025 | Award | 2,306 | $2.71 | $6.2K | 6.3K | Form 4 ↗ |
Intrater James director | Dec 31, 2025 | Award | 2,306 | $2.71 | $6.2K | 7.3K | Form 4 ↗ |
Burton Paul Frederick director | Dec 31, 2025 | Award | 2,306 | $2.71 | $6.2K | 7.3K | Form 4 ↗ |
Fung Peter K director | Sep 30, 2025 | Award | 1,559 | $4.01 | $6.3K | 4.0K | Form 4 ↗ |
Betts Wendy J director | Sep 30, 2025 | Award | 1,559 | $4.01 | $6.3K | 4.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Cardio Diagnostics Holdings, Inc. (CDIO) is primarily owned by institutional investors, who hold approximately 5.5% of total shares outstanding. Company insiders own approximately 6.79%, while retail and public investors account for the remaining 87.65%.
The largest institutional shareholder of Cardio Diagnostics Holdings, Inc. is BLACKROCK, INC., holding approximately 35,567 shares — equal to 2.02% of outstanding shares — as of September 30, 2025.
A total of 13 institutional investors currently hold CDIO stock, with a combined institutional value of approximately $462,227 as of the most recent 13F filing period.
Frequently asked questions
CDIO ownershipCardio Diagnostics Holdings, Inc. (CDIO) is primarily owned by institutional investors, who hold approximately 5.5% of shares. The largest shareholder is BLACKROCK, INC. with a 2.02% stake. Company insiders hold 6.79%. Data sourced from SEC Form 13F as of September 30, 2025.