Altimmune ALT Institutional Ownership

NASDAQ ALT

$2.23 -0.07 (-3.04%)

At close: Oct 21, 2026 · 4:00 PM EDT

Institutions by Trading Activity

209 Institutions

Increased 146 69.9%

Unchanged 32 15.3%

Reduced 31 14.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

77.15%

▲+23.90 pp QoQ

Shares Held by Institutions

150.04Mn

of 194.47Mn outstanding

▲+116.38% QoQ

Shares Outstanding

194.47Mn

44.44Mn held outside 13F filers

Institutional Investors

209

filed 13F for Jun 2026

▲+37 vs prior quarter

Net Shares Added (QoQ)

+80.70Mn

accumulated since last quarter

Value of Holdings

$345.09Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 11, 2026

Altimmune, Inc. (NASDAQ:ALT) was reported as a holding by 209 institutional investors in 13F filings for the quarter ended June 30, 2026.

Their combined stake equaled 77.15% of outstanding shares in Q2 2026, up from 53.25% in Q1 2026.
Total holdings of Altimmune shares rose 116.38% from Q1 2026, and the number of holders rose 18.75% from Q2 2025.
Of the 209 holders, 146 added to their positions, 31 reduced their stakes and 32 left their positions unchanged in Q2 2026.
Institutional investors held 150.04Mn shares of Altimmune in total at the end of Q2 2026, up 80.7Mn from the prior quarter and up 113.79Mn from a year earlier.
As of June 30, 2026, the biggest holder of Altimmune was BlackRock, Inc. with 20.39Mn shares, or 10.48% of shares outstanding.
Holders that added the most shares of Altimmune in Q2 2026 were BlackRock, Inc. (+7.59Mn shares), State Street Corp (+4.95Mn shares), Marshall Wace, LLP (+2.82Mn shares), Vanguard Capital Management LLC (+2.52Mn shares) and Vanguard Portfolio Management LLC (+1.95Mn shares).
Among holders that kept a stake in Altimmune, the biggest sellers in Q2 2026 were Susquehanna International Group, LLP (-594.88K shares), D. E. Shaw & Co., Inc. (-525.36K shares), Dimensional Fund Advisors LP (-406.49K shares), Point72 Asset Management, L.P. (-178.41K shares) and Two Sigma Investments, LP (-97.76K shares).
Altimmune's 10 largest institutional shareholders as of Q2 2026 were BlackRock, Inc. (20.39Mn shares), Deep Track Capital, LP (19.25Mn shares), State Street Corp (12.1Mn shares), TCG Crossover Management, LLC (10Mn shares), Vanguard Capital Management LLC (8.18Mn shares), Vanguard Portfolio Management LLC (7.33Mn shares), Marshall Wace, LLP (6.84Mn shares), Viking Global Investors LP (6.7Mn shares), Ra Capital Management, L.P. (6.5Mn shares) and Geode Capital Management, LLC (5.01Mn shares), per Business Quant data.

Form 13F Holdings

209 Institutional Holders

Report period 30 Jun, 2026

Total shares held 150.04Mn

Of outstanding 77.15%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	20,385,284	10.48%	▲7,590,007	+59.32%	$61.97Mn
2	Deep Track Capital, LP	0001856083	19,250,000	9.90%	▲19,250,000	0.00%	$58.52Mn
3	State Street Corp	0000093751	12,098,540	6.22%	▲4,952,990	+69.32%	$36.78Mn
4	TCG Crossover Management, LLC	0001839948	10,000,000	5.14%	▲10,000,000	0.00%	$30.40Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	8,177,752	4.21%	▲2,519,703	+44.53%	$24.86Mn
6	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	7,330,265	3.77%	▲1,948,263	+36.20%	$22.28Mn
7	MARSHALL WACE, LLP	0001318757	6,841,055	3.52%	▲2,823,154	+70.26%	$20.80Mn
8	VIKING GLOBAL INVESTORS LP	0001103804	6,700,000	3.45%	▲6,700,000	0.00%	$20.37Mn
9	RA CAPITAL MANAGEMENT, L.P.	0001346824	6,500,000	3.34%	▲6,500,000	0.00%	$19.76Mn
10	GEODE CAPITAL MANAGEMENT, LLC	0001214717	5,011,314	2.58%	▲1,904,218	+61.29%	$15.24Mn
11	Woodline Partners LP	0001784547	3,400,312	1.75%	▲3,400,312	0.00%	$10.34Mn
12	MILLENNIUM MANAGEMENT LLC	0001273087	3,309,122	1.70%	▲50,931	+1.56%	$10.06Mn
13	Trails Edge Capital Partners, LP	0002077247	2,660,000	1.37%	▲2,660,000	0.00%	$8.09Mn
14	Nuveen, LLC	0001871926	2,405,354	1.24%	▲70,753	+3.03%	$7.31Mn
15	TWO SIGMA INVESTMENTS, LP	0001179392	2,381,142	1.22%	▼97,758	-3.94%	$7.24Mn
16	Goldman Sachs Group Inc	0000886982	2,214,450	1.14%	▲863,801	+63.95%	$6.73Mn
17	GREAT POINT PARTNERS LLC	0001281446	1,741,232	0.90%	▲1,741,232	0.00%	$5.29Mn
18	Northern Trust Corp	0000073124	1,599,226	0.82%	▲602,505	+60.45%	$4.86Mn
19	Weiss Asset Management LP	0001357550	1,530,803	0.79%	▲1,530,803	0.00%	$4.65Mn
20	Nantahala Capital Management, LLC	0001472322	1,500,000	0.77%	▲1,500,000	0.00%	$4.56Mn

Showing 1 to 20 of 209 holders