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 63 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	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$13.97M 4,884,491 shares	0.00%	-126.82K(-2.50%)Reduced	SEC filing ↗ Nov 6, 2026	▾
02	BARCLAYS PLC CIK 312069 · View history	$2.64M 922,127 shares	0.00%	+570.54K(+162.30%)Added	SEC filing ↗ Nov 6, 2026	▾
03	Hennion & Walsh Asset Management, Inc. CIK 1861642 · View history	$2.13M 744,997 shares	0.06%	+226.80K(+43.80%)Added	SEC filing ↗ Oct 13, 2026	▾
04	Bank of New York Mellon Corp CIK 1390777 · View history	$1.92M 670,825 shares	0.00%	-18.89K(-2.70%)Reduced	SEC filing ↗ Nov 5, 2026	▾
05	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$1.79M 626,553 shares	0.00%	-12.88K(-2.00%)Reduced	SEC filing ↗ Nov 4, 2026	▾
06	Beirne Wealth Consulting Services, LLC CIK 1697303 · View history	$1.21M 421,858 shares	0.24%	0(0.00%)Unchanged	SEC filing ↗ Oct 19, 2026	▾
07	ALPS ADVISORS INC CIK 1376113 · View history	$731.80K 255,875 shares	0.00%	+58.50K(+29.60%)Added	SEC filing ↗ Nov 3, 2026	▾
08	BROWN WEALTH MANAGEMENT, LLC CIK 1987005 · View history	$686.79K 240,136 shares	0.15%	+4.00K(+1.70%)Added	SEC filing ↗ Oct 20, 2026	▾
09	COMMONWEALTH EQUITY SERVICES, LLC CIK 312272 · View history	$601.83K 210,431 shares	0.00%	-4.14K(-1.90%)Reduced	SEC filing ↗ Nov 2, 2026	▾
10	DEUTSCHE BANK AG\ CIK 948046 · View history	$485.09K 169,612 shares	0.00%	-25.40K(-13.00%)Reduced	SEC filing ↗ Nov 6, 2026	▾
11	Creative Planning CIK 1540235 · View history	$460.48K 161,008 shares	0.00%	-57.27K(-26.20%)Reduced	SEC filing ↗ Nov 2, 2026	▾
12	SIMPLEX TRADING, LLC CIK 1488542 · View history	$418.75K 146,416 shares	0.01%	+146.42KNew	SEC filing ↗ Nov 4, 2026	▾
13	CITIGROUP INC CIK 831001 · View history	$402.82K 140,846 shares	0.00%	-153.10K(-52.10%)Reduced	SEC filing ↗ Nov 4, 2026	▾
14	LPL Financial LLC CIK 1403438 · View history	$362.83K 126,865 shares	0.00%	+4.91K(+4.00%)Added	SEC filing ↗ Nov 6, 2026	▾
15	WEALTH EFFECTS LLC CIK 1907254 · View history	$360.22K 125,950 shares	0.10%	+3.30K(+2.70%)Added	SEC filing ↗ Oct 23, 2026	▾
16	Summit Financial Wealth Advisors, LLC CIK 1632283 · View history	$295.40K 103,288 shares	0.04%	0(0.00%)Unchanged	SEC filing ↗ Oct 15, 2026	▾
17	Leonteq Securities AG CIK 1535950 · View history	$286.00K 100,000 shares	0.02%	+36.00K(+56.30%)Added	SEC filing ↗ Oct 29, 2026	▾
18	PROFUND ADVISORS LLC CIK 1129919 · View history	$198.02K 69,238 shares	0.01%	-44.36K(-39.00%)Reduced	SEC filing ↗ Oct 29, 2026	▾
19	Russell Investments Group, Ltd. CIK 1692234 · View history	$126.03K 44,066 shares	0.00%	+370(+0.80%)Added	SEC filing ↗ Nov 6, 2026	▾
20	China Universal Asset Management Co., Ltd. CIK 1906594 · View history	$105.41K 35,492 shares	0.01%	+4.54K(+14.70%)Added	SEC filing ↗ Oct 28, 2026	▾

Showing 20 / 63 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

10,630,264

Not deduplicated across managers

Disclosed value

$30.41M

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 2026

Explore all 63 reporting institutions.

This page includes 20 of 63 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.