$ALT

$2.05 -$0.07 (3.3%) Close

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

Ownership

13F as of Q2 2026 · 194.5M shares outstanding

Who owns ALT?

By type of holder

Institutions 76.7% Insiders 0.0% Everyone else 23.3%

Concentration Top 10 holders own 52.6%

BlackRock, Inc. 10.5% · Deep Track Capital, LP 9.9%

Institutional ownership

76.7%

+41.1 pts vs last qtr

Institutional holders

208

+35 vs last qtr

Net shares bought

+79.8M

by institutions in Q2 2026

New / sold out

57 / 22

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Deep Track Capital, LP NEW +19.3M
TCG Crossover Management, LLC NEW +10.0M

Biggest sellers in Q2 2026

Alyeska Investment Group, L.P. SOLD OUT −2.6M
Susquehanna International Group, LLP SOLD OUT −1.3M

Who is planning to sell?

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

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+243.7%

+28.00% a year

Each share's claim on the business

−70.9%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $57.3M

over 6 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+ years43% 3–5 years4% 1–3 years7% Under 1 year46%

Quarterly turnover

67.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ALT on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	20.4M	10.48%	+7.6M (+59.3%)	≤2021	0.0%
Shares held by quarter Peak holding20.4M (Q2'26) Change over 8 quarters+14.9M Share of the company10.480% BlackRock, Inc.'s full portfolio →
DT Deep Track Capital, LP	19.3M	9.90%	NEW	Q2 '26	0.9%
Shares held by quarter Peak holding19.3M (Q2'26) Change over 8 quarters+19.3M Share of the company9.900% Deep Track Capital, LP's full portfolio →

BlackRock, Inc.

20.4M

% of company

10.48%

Change vs last qtr

+7.6M (+59.3%)

Held since

≤2021

Deep Track Capital, LP

19.3M

% of company

9.90%

Change vs last qtr

NEW

Held since

Q2 '26

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting ALT on Form N-PORT; together they hold 24.0% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
SS State Street(R) SPDR(R) S&P(R) Biotech ETF SPDR Series Trust	$24.6M	8.1M	4.16%	0.23%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$17.5M	5.7M	2.96%	0.00%	June 30, 2026

State Street(R) SPDR(R) S&P(R) Biotech ETF

SPDR Series Trust

Position value

$24.6M

% of company

4.16%

% of the fund

0.23%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$17.5M

% of company

2.96%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Altimmune, Inc. and how much of the fund the position is.

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