$CDIO

$1.70 -$0.02 (1.16%) Close

$CDIO Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 3.0M shares outstanding

Who owns CDIO?

By type of holder

Institutions 6.5% Everyone else 93.5%

No insider has reported a holding in the last two years, so insiders are counted in "Everyone else".

Concentration Top 10 holders own 6.4%

Jane Street Group, LLC 0.4% · Renaissance Technologies LLC 1.7%

Institutional ownership

6.5%

-2.8 pts vs last qtr

Institutional holders

+1 vs last qtr

Net shares bought

−83.3K

by institutions in Q2 2026

New / sold out

4 / 3

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Renaissance Technologies LLC +33.9K
Citadel Advisors LLC NEW +19.1K

Biggest sellers in Q2 2026

Jane Street Group, LLC −69.4K
HRT Financial LP SOLD OUT −62.5K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Cardio Diagnostics Holdings Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+95.4%

+95.38% a year

Each share's claim on the business

−48.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $2.7M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years26% 1–3 years18% Under 1 year55%

Quarterly turnover

43.7%

of institutional shares changed hands

Top 10 managers, median time held

2.5 years

Super Investors

Investment managers reporting CDIO on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
JS Jane Street Group, LLC	11.9K	0.40%	−69.4K (−85.3%)	Q1 '26	0.0%
Shares held by quarter Peak holding112.6K (Q4'24) Change over 8 quarters+11.9K Share of the company0.400% Jane Street Group, LLC's full portfolio →
HF HRT Financial LP	—	—	SOLD OUT	—	0.0%
Shares held by quarter Peak holding155.4K (Q4'24) Change over 8 quarters−11.0K HRT Financial LP's full portfolio →

Jane Street Group, LLC

11.9K

% of company

0.40%

Change vs last qtr

−69.4K (−85.3%)

Held since

Q1 '26

HRT Financial LP

—

% of company

—

Change vs last qtr

SOLD OUT

Held since

—

18 more super investors behind a free account

See every manager holding Cardio Diagnostics Holdings Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CDIO on Form N-PORT; together they hold 1.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$44.1K	20.2K	0.68%	0.00%	June 30, 2026
FE Fidelity Extended Market Index Fund Fidelity Concord Street Trust	$29.3K	15.7K	0.53%	0.00%	August 31, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$44.1K

% of company

0.68%

% of the fund

0.00%

As of

June 30, 2026

Fidelity Extended Market Index Fund

Fidelity Concord Street Trust

Position value

$29.3K

% of company

0.53%

% of the fund

0.00%

As of

August 31, 2026

4 more funds behind a free account

See every fund holding Cardio Diagnostics Holdings Inc and how much of the fund the position is.

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