$ATOS

$2.38 -$0.07 (2.86%) Close

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

Ownership

13F as of Q2 2026 · 10.0M shares outstanding

Who owns ATOS?

By type of holder

Institutions 0.0% Insiders 3.5% Everyone else 96.5%

Concentration Top 8 holders own 3.5%

Quay Steven C 1.6% · Chen Shu-Chih 0.8%

Institutional ownership

0.0%

0.0 pts vs last qtr

Institutional holders

0 vs last qtr

Net shares bought

by institutions in Q2 2026

New / sold out

0 / 0

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

None.

Biggest sellers in Q2 2026

None.

Who is planning to sell?

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

Is your stake being diluted?

Diluted share count, FY2022–FY2025

+1.5%

+0.50% a year

Each share's claim on the business

−1.5%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$1.48M vs $16.3M

over 4 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

No 13F manager reports holding ATOS.

Super Investors

Investment managers reporting ATOS on Form 13F

No 13F manager reports holding ATOS yet.

Institutional Funds

Mutual funds and ETFs reporting ATOS on Form N-PORT; together they hold 98.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.27M	3.8M	38.50%	0.00%	December 31, 2025
CS Columbia Small Cap Value Discovery Fund Columbia Funds Series Trust I	$1.56M	2.8M	27.59%	0.08%	January 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.27M

% of company

38.50%

% of the fund

0.00%

As of

December 31, 2025

Columbia Small Cap Value Discovery Fund

Columbia Funds Series Trust I

Position value

$1.56M

% of company

27.59%

% of the fund

0.08%

As of

January 31, 2026

11 more funds behind a free account

See every fund holding Atossa Therapeutics Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
QS Quay Steven C Insider	154.2K	1.55%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.550% Quay Steven C's insider activity →
CS Chen Shu-Chih Insider	76.2K	0.76%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.760% Chen Shu-Chih's insider activity →

Quay Steven C

Insider

154.2K

% of company

1.55%

Change vs last qtr

—

Held since

—

Chen Shu-Chih

Insider

76.2K

% of company

0.76%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Atossa Therapeutics Inc.

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