Altimmune ALT Institutional Ownership

NASDAQ ALT

$3.30 +0.07 (+2.01%)

As of: Sep 4, 2026 · 11:51 AM 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

81.24%

▲+25.53 pp QoQ

Shares Held by Institutions

150.66Mn

of 185.44Mn outstanding

▲+129.44% QoQ

Shares Outstanding

185.44Mn

34.78Mn held outside 13F filers

Institutional Investors

209

filed 13F for Jun 2026

▲+37 vs prior quarter

Net Shares Added (QoQ)

+85.00Mn

accumulated since last quarter

Value of Holdings

$486.64Mn

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

Quarter ending 30 Jun, 2026

Altimmune, Inc. (NASDAQ:ALT) appears in 209 institutional 13F filings for the quarter ending June 2026.

These investors collectively held 81.2% of Altimmune's outstanding shares in June 2026, up from 55.7% in March 2026.
They increased total shares held in Altimmune by 129.44% from last quarter, and the number of investors in ALT increased 17.42% annually.
Activity in ALT broke down as 146 buyers, 31 sellers, and 32 unchanged among 209 total holders.
In total, institutional investors held 150.66Mn shares in Altimmune as of June 2026, up by 85.0Mn shares quarter on quarter, and up 113.71Mn shares year over year.
As of June 30, 2026, BlackRock, Inc. held the largest stake in Altimmune with 20.39Mn shares, accounting for 10.99% of total shares outstanding.
The biggest buyers of Altimmune for the quarter ending June 2026 included Deep Track Capital, LP (19.25Mn), TCG Crossover Management, LLC (10.0Mn), BlackRock, Inc. (7.59Mn), VIKING GLOBAL INVESTORS LP (6.7Mn), RA CAPITAL MANAGEMENT, L.P. (6.5Mn).
Leading sellers of Altimmune shares for the quarter ending June 2026 were SUSQUEHANNA INTERNATIONAL GROUP, LLP (594.88K), D. E. Shaw & Co., Inc. (525.36K), DIMENSIONAL FUND ADVISORS LP (406.49K), Point72 Asset Management, L.P. (178.4K), TWO SIGMA INVESTMENTS, LP (97.76K).
Altimmune's 10 largest shareholders as of June 2026 include BlackRock, Inc. (20.39Mn), Deep Track Capital, LP (19.25Mn), State Street Corp (12.1Mn), TCG Crossover Management, LLC (10.0Mn), VANGUARD CAPITAL MANAGEMENT LLC (8.18Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (7.33Mn), MARSHALL WACE, LLP (6.84Mn), VIKING GLOBAL INVESTORS LP (6.7Mn), RA CAPITAL MANAGEMENT, L.P. (6.5Mn), GEODE CAPITAL MANAGEMENT, LLC (5.01Mn) per Business Quant data.

Form 13F Holdings

209 Institutional Holders

Report period 30 Jun, 2026

Total shares held 150.66Mn

Of outstanding 81.24%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	20,385,284	10.99%	▲7,590,007	+59.32%	$61.97Mn
2	Deep Track Capital, LP	0001856083	19,250,000	10.38%	▲19,250,000	0.00%	$58.52Mn
3	State Street Corp	0000093751	12,098,540	6.52%	▲4,952,990	+69.32%	$36.78Mn
4	TCG Crossover Management, LLC	0001839948	10,000,000	5.39%	▲10,000,000	0.00%	$30.40Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	8,177,752	4.41%	▲2,519,703	+44.53%	$24.86Mn
6	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	7,330,265	3.95%	▲1,948,263	+36.20%	$22.28Mn
7	MARSHALL WACE, LLP	0001318757	6,841,055	3.69%	▲2,823,154	+70.26%	$20.80Mn
8	VIKING GLOBAL INVESTORS LP	0001103804	6,700,000	3.61%	▲6,700,000	0.00%	$20.37Mn
9	RA CAPITAL MANAGEMENT, L.P.	0001346824	6,500,000	3.51%	▲6,500,000	0.00%	$19.76Mn
10	GEODE CAPITAL MANAGEMENT, LLC	0001214717	5,011,314	2.70%	▲1,904,218	+61.29%	$15.24Mn
11	Woodline Partners LP	0001784547	3,400,312	1.83%	▲3,400,312	0.00%	$10.34Mn
12	MILLENNIUM MANAGEMENT LLC	0001273087	3,309,122	1.78%	▲50,931	+1.56%	$10.06Mn
13	Trails Edge Capital Partners, LP	0002077247	2,660,000	1.43%	▲2,660,000	0.00%	$8.09Mn
14	Nuveen, LLC	0001871926	2,405,354	1.30%	▲70,753	+3.03%	$7.31Mn
15	TWO SIGMA INVESTMENTS, LP	0001179392	2,381,142	1.28%	▼97,758	-3.94%	$7.24Mn
16	Goldman Sachs Group Inc	0000886982	2,214,450	1.19%	▲863,801	+63.95%	$6.73Mn
17	GREAT POINT PARTNERS LLC	0001281446	1,741,232	0.94%	▲1,741,232	0.00%	$5.29Mn
18	Northern Trust Corp	0000073124	1,599,226	0.86%	▲602,505	+60.45%	$4.86Mn
19	Weiss Asset Management LP	0001357550	1,530,803	0.83%	▲1,530,803	0.00%	$4.65Mn
20	Nantahala Capital Management, LLC	0001472322	1,500,000	0.81%	▲1,500,000	0.00%	$4.56Mn

Showing 1 to 20 of 209 holders