Cardio Diagnostics Holdings, Inc. (CDIO) — Institutional Holders, Q2 2026
23 institutional investment managers reported a CDIO position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $561.2K. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
CDIO in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- RENAISSANCE TECHNOLOGIESAdded · +33,852 sh+$74.1K
- CITADEL ADVISORSNew · +19,071 sh+$41.8K
- XTX Topco LtdNew · +16,093 sh+$35.2K
- STATE STREETNew · +10,099 sh+$22.1K
- WELLS FARGO & COMPANYNew · +2 sh+$4.00
Biggest sellers
- JANE STREET GROUPTrimmed · -69,350 sh-$151.9K
- HRT FINANCIALSold out · -62,482 sh-$136.8K
- Scientech ResearchSold out · -13,880 sh-$30.4K
- GEODE CAPITAL MANAGEMENTTrimmed · -5,944 sh-$13.0K
- VANGUARD FIDUCIARYTrimmed · -1,145 sh-$2.5K
CDIO 13F holders ranked 1–23 of 23
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | BOOTHBAY FUND MANAGEMENT#1 · 60,540 sh | 60,540 | $132.6K | <0.01% | 0.0% |
| 2 | RENAISSANCE TECHNOLOGIES#2 · 49,200 sh | 49,200 | $107.7K | <0.01% | +220.6% |
| 3 | BlackRock#3 · 34,708 sh | 34,708 | $76.0K | 0.00% | 0.0% |
| 4 | GEODE CAPITAL MANAGEMENT#4 · 26,233 sh | 26,233 | $57.4K | 0.00% | -18.5% |
| 5 | VANGUARD CAPITAL MANAGEMENT#5 · 20,155 sh | 20,155 | $44.1K | 0.00% | 0.0% |
| 6 | CITADEL ADVISORS#6 · 19,071 sh | 19,071 | $41.8K | 0.00% | New |
| 7 | XTX Topco Ltd#7 · 16,093 sh | 16,093 | $35.2K | <0.01% | New |
| 8 | JANE STREET GROUP#8 · 11,933 sh | 11,933 | $26.1K | 0.00% | -85.3% |
| 9 | STATE STREET#9 · 10,099 sh | 10,099 | $22.1K | 0.00% | New |
| 10 | VANGUARD FIDUCIARY#10 · 2,824 sh | 2,824 | $6.2K | 0.00% | -28.8% |
| 11 | Tower Research Capital (TRC)#11 · 1,809 sh | 1,809 | $4.0K | <0.01% | -17.5% |
| 12 | Saba Capital Management, L.P.#12 · 199,839 sh | 199,839 | $3.0K | <0.01% | 0.0% |
| 13 | UBS Group AG#13 · 6,217 sh | 6,217 | $1.5K | 0.00% | -59.8% |
| 14 | Clear Street Group#14 · 82,342 sh | 82,342 | $1.5K | 0.00% | 0.0% |
| 15 | D. E. Shaw#15 · 74,822 sh | 74,822 | $1.4K | 0.00% | 0.0% |
| 16 | WOLVERINE ASSET MANAGEMENT#16 · 104 sh | 104 | $228.00 | 0.00% | 0.0% |
| 17 | MORGAN STANLEY#17 · 100 sh | 100 | $219.00 | 0.00% | 0.0% |
| 18 | OSAIC#18 · 16 sh | 16 | $35.00 | 0.00% | 0.0% |
| 19 | SHP Wealth Management#19 · 16 sh | 16 | $35.00 | 0.00% | 0.0% |
| 20 | SBI Securities , Ltd.#20 · 10 sh | 10 | $22.00 | — | 0.0% |
| 21 | WELLS FARGO & COMPANY#21 · 2 sh | 2 | $4.00 | 0.00% | New |
| 22 | Virtu Financial#22 · 21,279 sh | 21,279 | $0.00 | 0.00% | -30.9% |
| 23 | Context Capital Management#23 · 81,500 sh | 81,500 | — | — | 0.0% |
Funds that sold out of CDIO in Q2 2026 (3)
Held CDIO at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| HRT FINANCIAL62,482 sh | 62,482 | $121.0K |
| Scientech Research13,880 sh | 13,880 | $27.1K |
| CITIGROUP1 sh | 1 | $2.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.