Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in CDIO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | JANE STREET GROUP, LLC | 81K | $159K | — | 3.925% | 0.00% |
| 2 | BlackRock, Inc. | 35K | $68K | -2.4% | 1.676% | 0.00% |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | 32K | $63K | +112.6% | 1.554% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 20K | $39K | — | 0.973% | 0.00% |
| 5 | RENAISSANCE TECHNOLOGIES LLC | 15K | $30K | — | 0.741% | 0.00% |
| 6 | Scientech Research LLC | 14K | $27K | — | 0.670% | 0.02% |
| 7 | UBS Group AG | 10K | $19K | +941.9% | 0.479% | 0.00% |
| 8 | VANGUARD FIDUCIARY TRUST CO | 4K | $8K | — | 0.192% | 0.00% |
| 9 | Tower Research Capital LLC (TRC) | 2K | $4K | +182.1% | 0.106% | 0.00% |
| 10 | WOLVERINE ASSET MANAGEMENT LLC | 104 | $203 | 0.0% | 0.005% | 0.00% |
| 11 | MORGAN STANLEY | 100 | $195 | 0.0% | 0.005% | 0.00% |
| 12 | HRT FINANCIAL LP | 62K | $121 | — | 3.018% | 0.00% |
| 13 | ADVISOR GROUP HOLDINGS, INC. | 16 | $31 | 0.0% | 0.001% | 0.00% |
| 14 | SHP Wealth Management | 16 | $31 | — | 0.001% | 0.00% |
| 15 | SBI Securities Co., Ltd. | 10 | $20 | -61.5% | 0.001% | 0.00% |
| 16 | CITIGROUP INC | 1 | $2 | -96.2% | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in CDIO — a direct measure of their conviction.
Filings activity in CDIO during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 16 | +14% | 10.28% | +4.33 pp | $0M | +73% |
| Q4 2025 | 14 | +7.7% | 5.95% | 3.64 pp | $0M | 38% |
| Q3 2025 | 13 | 24% | 9.59% | +2.00 pp | $0M | +26% |
| Q2 2025 | 17 | 29% | 7.59% | 12.65 pp | $0M | 62% |
| Q1 2025 | 24 | +0.0% | 20.24% | 34.21 pp | $1M | 63% |
| Q4 2024 | 24 | +50% | 54.45% | +45.29 pp | $2M | +495% |
| Q3 2024 | 16 | 5.9% | 9.16% | 15.38 pp | $0M | 63% |
| Q2 2024 | 17 | — | 24.54% | — | $1M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying CDIO stock.
Based on Q1 2026 13F filings, institutional ownership of Cardio Diagnostics Holdings, Inc. stands at 10.3%, held across 16 reporting institutions.
JANE STREET GROUP, LLC is the largest reported institutional holder of CDIO, with approximately 81,283 shares worth $0.00B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of CDIO, including JANE STREET GROUP, LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for CDIO is 68 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
7 institutions opened new positions in CDIO during Q1 2026, while 5 fully exited. 3 added to existing positions and 6 trimmed.
CDIO institutional ownership rose by 4.33 percentage points quarter-over-quarter, with a net change of +2 holders.
The top 10 institutions account for 99.9% of all reported 13F value in CDIO, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Cardio Diagnostics Holdings, Inc. (CDIO) Institutional Ownership