ALT · Altimmune, Inc. · Shareholders & Ownership
$2.30
+0.07 (+3.14%)
At close · Oct 20
Return incl. dividend (before tax)
Market Cap
$441.56M
Shares
194.52M
Volume · Oct 20
2.29M
Avg daily vol (3M)
4.25M
Every disclosed holder of ALT in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns ALT
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 150,249,504 | 77.24% |
| Insiders (Forms 3, 4, 5) | 883,846 | 0.45% |
| 13D/G-only blocks | 22,750,273 | 11.70% |
| Remaining | 20,634,078 | 10.61% |
| Registered funds (N-PORT, not summed) | 43,473,698 | 22.35% |
Shares outstanding: 194,517,701, the issuer's latest cover-page count restated onto today's split basis.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of ALT
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
20,385,284 | ||
| 1.1 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
5,161,850 | ||
| 1.2 |
iShares Russell 2000 Value ETF
Fund
S000004342 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,869,684 | ||
| 1.3 |
iShares Biotechnology ETF
Fund
S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,295,713 | ||
| 1.4 |
BlackRock Advantage Small Cap Core Fund
Fund
S000039982 · Registered fund · May 29, 2026
BlackRock Funds, not summed
|
1,045,359 | ||
| 1.5 |
iShares Micro-Cap ETF
Fund
S000004439 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
668,001 | ||
| 2 |
|
20,000,000 | ||
| 3 |
Deep Track Capital, LP
13F
CIK 1856083 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
19,250,000 | ||
| 4 |
|
12,098,540 | ||
| 4.1 |
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund
S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
8,096,724 | ||
| 4.2 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
51,100 | ||
| 4.3 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
5,018 | ||
| 4.4 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
439 | ||
| 5 |
TCG Crossover Management, LLC
13F
CIK 1839948 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,000,000 | ||
| 6 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8,177,752 | ||
| 7 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,330,265 | ||
| 8 |
MARSHALL WACE, LLP
13F
CIK 1318757 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,841,055 | ||
| 9 |
VIKING GLOBAL INVESTORS LP
13F
CIK 1103804 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,700,000 | ||
| 10 |
RA CAPITAL MANAGEMENT, L.P.
13F
CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,500,000 | ||
| 11 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
5,748,771 | ||
| 12 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,011,314 | ||
| 13 |
Woodline Partners LP
13F
CIK 1784547 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,400,312 | ||
| 14 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,309,122 | ||
| 15 |
TANG CAPITAL MANAGEMENT, LLC
13G
CIK 1191935 · Unknown · Dec 31, 2023
Rule 13d-1(c), passive investor
|
2,750,000 | ||
| 16 |
Trails Edge Capital Partners, LP
13F
CIK 2077247 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,660,000 | ||
| 17 |
VANGUARD STRATEGIC EQUITY FUND
Fund
S000002593 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
|
2,519,635 | ||
| 18 |
|
2,405,354 | ||
| 18.1 |
Nuveen Small Cap Blend Index Fund
Fund
S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
264,710 | ||
| 18.2 |
College Retirement Equities Fund - Total Global Stock Account
Fund
S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
|
141,468 | ||
| 18.3 |
Nuveen Equity Index Fund
Fund
S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
|
99,727 | ||
| 18.4 |
Nuveen Life Small Cap Equity Fund
Fund
S000005093 · Registered fund · Jun 30, 2026
TIAA-CREF Life Funds, not summed
|
38,470 | ||
| 18.5 |
TIAA Separate Account VA-1 - Stock Index Account
Fund
S000005098 · Registered fund · Jun 30, 2026
TIAA Separate Account VA-1, not summed
|
1,340 | ||
| 19 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,381,142 | ||
| 20 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,236,217 | ||
| 21 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,214,450 | ||
| 21.1 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
|
9,521 | ||
| 22 |
GREAT POINT PARTNERS LLC
13F
CIK 1281446 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,741,232 | ||
| 23 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,599,226 | ||
| 23.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
102,890 | ||
| 23.2 |
Small Cap Core Fund
Fund
S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
7,696 | ||
| 24 |
Weiss Asset Management LP
13F
CIK 1357550 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,530,803 | ||
| 25 |
Nantahala Capital Management, LLC
13F
CIK 1472322 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,500,000 | ||
| 26 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,293,001 | ||
| 27 |
Cormorant Asset Management, LP
13F
CIK 1583977 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,250,000 | ||
| 28 |
AQR CAPITAL MANAGEMENT LLC
13F
CIK 1167557 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,220,949 | ||
| 29 |
VANGUARD EXPLORER FUND
Fund
S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
|
1,213,513 | ||
| 30 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
983,559 | ||
| 31 |
VANGUARD STRATEGIC SMALL-CAP EQUITY FUND
Fund
S000012432 · Registered fund · Jun 30, 2026
VANGUARD HORIZON FUNDS, not summed
|
867,177 | ||
| 32 |
|
866,385 | ||
| 33 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
758,435 | ||
| 34 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
757,919 | ||
| 35 |
Ghisallo Capital Management LLC
13F
CIK 1825214 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
750,000 | ||
| 36 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
748,974 | ||
| 36.1 |
Fidelity Small Cap Index Fund
Fund
S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
2,173,494 | ||
| 36.2 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
988,478 | ||
| 36.3 |
Fidelity Enhanced Small Cap Core ETF
Fund
S000081807 · Registered fund · Jun 30, 2026
Fidelity Covington Trust, not summed
|
638,025 | ||
| 36.4 |
Fidelity Total Market Index Fund
Fund
S000006026 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
357,417 | ||
| 36.5 |
Fidelity Series Total Market Index Fund
Fund
S000065248 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
290,374 | ||
| 37 |
Hennion & Walsh Asset Management, Inc.
13F
CIK 1861642 · Unknown · Sep 30, 2026
|
744,997 | ||
| 38 |
SUSQUEHANNA INTERNATIONAL GROUP, LLP
13F
CIK 1446194 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
731,078 | ||
| 39 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
689,713 | ||
| 40 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
670,084 | ||
| 41 |
TANG CAPITAL MANAGEMENT LLC
13F
CIK 1232621 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
666,022 | ||
| 42 |
DIMENSIONAL FUND ADVISORS LP
13F
CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
639,436 | ||
| 42.1 |
U.S. MICRO CAP PORTFOLIO
Fund
S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
|
210,694 | ||
| 42.2 |
Dimensional U.S. Small Cap ETF
Fund
S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
167,692 | ||
| 42.3 |
Dimensional U.S. Core Equity 2 ETF
Fund
S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
34,439 | ||
| 42.4 |
Dimensional U.S. Equity Market ETF
Fund
S000070902 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
25,408 | ||
| 42.5 |
Dimensional US Core Equity Market ETF
Fund
S000069432 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
|
9,653 | ||
| 43 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
624,499 | ||
| 43.1 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
483,547 | ||
| 43.2 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
140,831 | ||
| 44 |
VANGUARD HEALTH CARE INDEX FUND
Fund
S000004450 · Registered fund · May 31, 2026
VANGUARD WORLD FUND, not summed
|
567,179 | ||
| 45 |
Point72 Asset Management, L.P.
13F
CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
486,884 | ||
| 46 |
Rock Springs Capital Management LP
13F
CIK 1595725 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
471,465 | ||
| 47 |
|
424,519 | ||
| 48 |
Beirne Wealth Consulting Services, LLC
13F
CIK 1697303 · Unknown · Sep 30, 2026
|
421,858 | ||
| 49 |
WELLINGTON MANAGEMENT GROUP LLP
13F
CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
420,300 | ||
| 50 |
VANGUARD MARKET NEUTRAL FUND
Fund
S000019457 · Registered fund · Jun 30, 2026
VANGUARD MONTGOMERY FUNDS, not summed
|
400,755 |
21 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
Showing 1–50 of 282 holders
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Key facts
CIK
1326190
CUSIP
02155H200
13F (30d)
21 filings
21 filers
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