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 173 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

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	BlackRock Inc. CIK 1364742 · View history	$35.39M 5,321,089 shares	0.00%	+1.28M(+31.60%)Added	SEC filing ↗ Aug 13, 2024	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$32.63M 4,906,614 shares	0.00%	+1.78M(+56.80%)Added	SEC filing ↗ Aug 13, 2024	▾
03	STATE STREET CORP CIK 93751 · View history	$26.00M 3,909,286 shares	0.00%	-4.74M(-54.80%)Reduced	SEC filing ↗ Aug 14, 2024	▾
04	AMERIPRISE FINANCIAL INC CIK 820027 · View history	$21.44M 3,223,997 shares	0.01%	+1.51M(+88.60%)Added	SEC filing ↗ Aug 14, 2024	▾
05	TANG CAPITAL MANAGEMENT LLC CIK 1232621 · View history	$18.29M 2,750,000 shares	1.86%	0(0.00%)Unchanged	SEC filing ↗ Aug 14, 2024	▾
06	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$14.70M 2,210,401 shares	0.03%	+1.29M(+141.20%)Added	SEC filing ↗ Aug 15, 2024	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$10.60M 1,593,810 shares	0.00%	+357.01K(+28.90%)Added	SEC filing ↗ Aug 9, 2024	▾
08	MORGAN STANLEY CIK 895421 · Amended · View history	$8.59M 1,291,020 shares	0.00%	-920.93K(-41.60%)Reduced	SEC filing ↗ May 14, 2025	▾
09	Knoll Capital Management, LLC CIK 1325083 · View history	$7.46M 1,121,524 shares	5.03%	+554.30K(+97.70%)Added	SEC filing ↗ Aug 14, 2024	▾
10	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$6.72M 1,010,149 shares	0.00%	+148.73K(+17.30%)Added	SEC filing ↗ Aug 13, 2024	▾
11	CAPITAL FUND MANAGEMENT S.A. CIK 1323645 · View history	$5.89M 886,277 shares	0.07%	+886.28KNew	SEC filing ↗ Aug 13, 2024	▾
12	D. E. Shaw & Co., Inc. CIK 1009207 · View history	$5.07M 762,362 shares	0.01%	+408.01K(+115.10%)Added	SEC filing ↗ Aug 14, 2024	▾
13	Nuveen Asset Management, LLC CIK 1521019 · View history	$4.42M 665,058 shares	0.00%	-247.94K(-27.20%)Reduced	SEC filing ↗ Aug 9, 2024	▾
14	Portolan Capital Management, LLC CIK 1350290 · View history	$4.26M 640,242 shares	0.35%	-247.01K(-27.80%)Reduced	SEC filing ↗ Aug 14, 2024	▾
15	Bellevue Group AG CIK 1674546 · View history	$3.99M 600,000 shares	0.06%	+600.00KNew	SEC filing ↗ Aug 14, 2024	▾
16	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$3.83M 576,566 shares	0.01%	+576.57KNew	SEC filing ↗ Aug 14, 2024	▾
17	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$3.79M 570,174 shares	0.00%	+335.44K(+142.90%)Added	SEC filing ↗ Aug 9, 2024	▾
18	NORTHERN TRUST CORP CIK 73124 · View history	$3.51M 527,297 shares	0.00%	+33.33K(+6.70%)Added	SEC filing ↗ Aug 14, 2024	▾
19	GSA CAPITAL PARTNERS LLP CIK 1362033 · View history	$3.25M 488,125 shares	0.23%	+436.97K(+854.20%)Added	SEC filing ↗ Aug 15, 2024	▾
20	READYSTATE ASSET MANAGEMENT LP CIK 1900923 · View history	$3.24M 486,738 shares	0.15%	-339.06K(-41.10%)Reduced	SEC filing ↗ Aug 14, 2024	▾

Showing 20 / 173 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

173

Cancelled or null records excluded

Disclosed shares

42,415,999

Not deduplicated across managers

Disclosed value

$282.06M

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. · Q2 2024

Explore all 173 reporting institutions.

This page includes 20 of 173 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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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.