$ATTO

$15.00 +$1.12 (8.07%) Close

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

Ownership

13F as of Q2 2026 · 45.7M shares outstanding

Who owns ATTO?

By type of holder

Institutions 0.0% Insiders 56.4% Everyone else 43.6%

Concentration Top 10 holders own 70.7%

Frazier Life Sciences XI, L.P. 13.5% · Fhmls Xi, L.P. 13.5%

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

No 13F manager has reported this stock in the last 8 quarters.

Biggest buyers in Q2 2026

None.

Biggest sellers in Q2 2026

None.

Who is planning to sell?

Notices of proposed sale, last 12 months

$2.22M

1 notice from 1 person

Shares covered

105.8K

0.23% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Goldman Sachs Group Inc Former 10% owner $2.22M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

There are not yet two fiscal years of reported share counts for Attovia Therapeutics Inc.

How patient are the owners?

No 13F manager reports holding ATTO.

Super Investors

Investment managers reporting ATTO on Form 13F

No 13F manager reports holding ATTO yet.

Institutional Funds

Mutual funds and ETFs reporting ATTO on Form N-PORT; together they hold 1.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SB Select Biotechnology Portfolio Fidelity Select Portfolios	$15M	700.0K	1.53%	0.24%	August 31, 2026
FN Fidelity Nasdaq Composite Index Fund Fidelity Concord Street Trust	$906K	42.3K	0.09%	0.00%	August 31, 2026

Select Biotechnology Portfolio

Fidelity Select Portfolios

Position value

$15M

% of company

1.53%

% of the fund

0.24%

As of

August 31, 2026

Fidelity Nasdaq Composite Index Fund

Fidelity Concord Street Trust

Position value

$906K

% of company

0.09%

% of the fund

0.00%

As of

August 31, 2026

1 more funds behind a free account

See every fund holding Attovia 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
FL Frazier Life Sciences XI, L.P. 5%+ holder 13D · 13.5%	6.2M	13.48%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company13.480% Disclosed stake13D · 13.5% View the 13D/G filing →
FX Fhmls Xi, L.P. 5%+ holder 13D · 13.5%	6.2M	13.48%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company13.480% Disclosed stake13D · 13.5% View the 13D/G filing →

Frazier Life Sciences XI, L.P.

5%+ holder13D · 13.5%

6.2M

% of company

13.48%

Change vs last qtr

—

Held since

—

Fhmls Xi, L.P.

5%+ holder13D · 13.5%

6.2M

% of company

13.48%

Change vs last qtr

—

Held since

—

17 more holders behind a free account

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

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