Company · Ownership research

Altimmune, Inc. ALT

CIK 0001326190 · CUSIP 02155H200

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 02155H200 (ALT), not CUSIP 02155H900 (ALT), CUSIP 02155H950 (ALT), and does not merge CUSIPs.

This page lists the top 20 of 158 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	VANGUARD GROUP INC CIK 102909 · View history	$24.03M 6,373,638 shares	0.00%	+1.21M(+23.30%)Added	SEC filing ↗ Nov 7, 2025	▾
02	BlackRock, Inc. CIK 2012383 · View history	$24.03M 6,373,259 shares	0.00%	+699(0.00%)Added	SEC filing ↗ Nov 12, 2025	▾
03	STATE STREET CORP CIK 93751 · View history	$13.58M 3,601,255 shares	0.00%	+847.62K(+30.80%)Added	SEC filing ↗ Nov 14, 2025	▾
04	TANG CAPITAL MANAGEMENT LLC CIK 1232621 · View history	$8.04M 2,131,307 shares	0.31%	-618.69K(-22.50%)Reduced	SEC filing ↗ Nov 14, 2025	▾
05	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$7.61M 2,017,385 shares	0.00%	+82.50K(+4.30%)Added	SEC filing ↗ Nov 12, 2025	▾
06	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$7.53M 1,996,848 shares	0.01%	+1.56M(+356.60%)Added	SEC filing ↗ Nov 14, 2025	▾
07	MORGAN STANLEY CIK 895421 · Amended · View history	$5.62M 1,491,049 shares	0.00%	+655.64K(+78.50%)Added	SEC filing ↗ May 27, 2026	▾
08	TWO SIGMA ADVISERS, LP CIK 1478735 · View history	$5.39M 1,428,400 shares	0.01%	+1.30M(+1,005.60%)Added	SEC filing ↗ Nov 14, 2025	▾
09	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$5.18M 1,374,182 shares	0.01%	-245.56K(-15.20%)Reduced	SEC filing ↗ Nov 14, 2025	▾
10	CITADEL ADVISORS LLC CIK 1423053 · View history	$4.83M 1,282,014 shares	0.00%	+758.55K(+144.90%)Added	SEC filing ↗ Nov 14, 2025	▾
11	Knoll Capital Management, LLC CIK 1325083 · View history	$4.23M 1,121,524 shares	2.27%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
12	NORTHERN TRUST CORP CIK 73124 · View history	$2.48M 657,016 shares	0.00%	+16.67K(+2.60%)Added	SEC filing ↗ Nov 14, 2025	▾
13	UBS Group AG CIK 1610520 · View history	$2.42M 642,837 shares	0.00%	-244.08K(-27.50%)Reduced	SEC filing ↗ Nov 13, 2025	▾
14	Squarepoint Ops LLC CIK 1642575 · View history	$2.20M 584,696 shares	0.00%	+584.70KNew	SEC filing ↗ Nov 14, 2025	▾
15	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$2.12M 562,257 shares	0.00%	+63.02K(+12.60%)Added	SEC filing ↗ Nov 14, 2025	▾
16	Point72 Asset Management, L.P. CIK 1603466 · View history	$1.80M 476,926 shares	0.00%	+476.93KNew	SEC filing ↗ Nov 14, 2025	▾
17	FMR LLC CIK 315066 · View history	$1.68M 445,137 shares	0.00%	+43.29K(+10.80%)Added	SEC filing ↗ Nov 13, 2025	▾
18	Beirne Wealth Consulting Services, LLC CIK 1697303 · View history	$1.55M 410,458 shares	0.37%	+68.00K(+19.90%)Added	SEC filing ↗ Nov 7, 2025	▾
19	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$1.39M 367,582 shares	0.00%	+289.29K(+369.50%)Added	SEC filing ↗ Nov 14, 2025	▾
20	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$1.36M 360,395 shares	0.00%	+309.14K(+603.10%)Added	SEC filing ↗ Nov 14, 2025	▾

Showing 20 / 158 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

158

Cancelled or null records excluded

Disclosed shares

41,478,819

Not deduplicated across managers

Disclosed value

$156.52M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Altimmune, Inc. · Q3 2025

Explore all 158 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.