CDIO · Cardio Diagnostics Holdings, Inc.

$1.85 -0.02 (-1.07%) At close · Sep 1

Market Cap

$5.53M

2.96M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Quarter:

Holders: 22

Total Value: $422,724

Total Shares: 637,412

Institutional Ownership Trend

18 quarters

Holder Concentration

Across 22 13F filers · Δ vs Mar 31, 2026

Top Holder

25.5%

−3.9 pts

Top 5

77.4%

−6.1 pts

Top 10

99.5%

−0.4 pts

HHI

1,503

Moderately concentrated−292

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: 0

Institutional value: -21.6%

Shares held: -21.5%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds	Open
Large RENAISSANCE TECHNOLOGIES LLC	+33,852	49,200

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Mega JANE STREET GROUP, LLC	−69,350	11,933
Mid Virtu Financial LLC	−9,509	21,279
Mega UBS Group AG	−9,263	6,217
Mega GEODE CAPITAL MANAGEMENT, LLC	−5,944	26,233
Mega VANGUARD FIDUCIARY TRUST CO	−1,145	2,824

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Mega CITADEL ADVISORS LLC	19,071	$41,765
Mid XTX Topco Ltd	16,093	$35,243
Mega STATE STREET CORP	10,099	$22,116
Mega WELLS FARGO & COMPANY/MN	2	$4

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large HRT FINANCIAL LP	62,482	$121,839
Small Scientech Research LLC	13,880	$27,066
Mega CITIGROUP INC	1	$1
Small Context Capital Management, LLC	81,500	$0

Filter: New 4 Increased 1 Reduced 6 Sold out 4 Unchanged 11

Showing 23 of 23

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

RENAISSANCE TECHNOLOGIES LLC

$107,748

25.49%

49,200

BlackRock, Inc.

$76,010

17.98%

34,708

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BlackRock Institutional Trust Company, N.A.	34,708	$76,010	100.0%	Sole

GEODE CAPITAL MANAGEMENT, LLC

$57,449

13.59%

26,233

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	5,413	$11,854	20.6%	Defined
Held directly	20,820	$45,595	79.4%	Defined

VANGUARD CAPITAL MANAGEMENT LLC

$44,139

10.44%

20,155

CITADEL ADVISORS LLC

$41,765

9.88%

19,071

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	19,071	$41,765	100.0%	Defined

XTX Topco Ltd

$35,243

8.34%

16,093

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	16,093	$35,243	100.0%	Defined

JANE STREET GROUP, LLC

$26,132

6.18%

11,933

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	7,763	$17,000	65.1%	Defined
Jane Street Global Trading, LLC	4,170	$9,132	34.9%	Defined

STATE STREET CORP

$22,116

5.23%

10,099

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	10,099	$22,116	100.0%	Defined

VANGUARD FIDUCIARY TRUST CO

$6,184

1.46%

2,824

Tower Research Capital LLC (TRC)

$3,961

0.94%

1,809

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	1,809	$3,961	100.0%	Defined

UBS Group AG

$1,436

0.34%

656

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS AG	153	$335	23.3%	Defined
UBS Securities LLC	503	$1,101	76.7%	Defined

WOLVERINE ASSET MANAGEMENT LLC

$227

0.05%

104

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wolverine Holdings, LLC	104	$227	100.0%	Defined

MORGAN STANLEY

$219

0.05%

100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY SMITH BARNEY LLC	100	$219	100.0%	Defined

SHP Wealth Management

$35

0.01%

OSAIC HOLDINGS, INC.

$35

0.01%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	16	$35	100.0%	Defined

SBI Securities Co., Ltd.

$21

0.00%

WELLS FARGO & COMPANY/MN

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO CLEARING SERVICES, LLC	2	$4	100.0%	Defined

Virtu Financial LLC CDIOW

—

21,279

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	21,279	$0	—	Defined

Saba Capital Management, L.P. CDIOW

—

199,839

Clear Street Group Inc. CDIOW

—

82,342

D. E. Shaw & Co., Inc. CDIOW

—

74,822

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
D. E. SHAW & CO, L.P.	74,822	$0	—	Defined

UBS Group AG CDIOW

—

5,561

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Securities LLC	5,561	$0	—	Defined

BOOTHBAY FUND MANAGEMENT, LLC CDIOW

—

60,540

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	1	$1	100.0%	Defined

Key facts CIK 1870144 CUSIP 14159C202 13F (30d) 21 filings 21 filers Visit website Investor relations