Security Snapshot

Altimmune, Inc. - Common stock, par value $0.0001 per share (ALT) Institutional Ownership

CUSIP: 02155H200

13F Institutional Holders and Ownership History from Q3 2018 to Q3 2026

13F reference period

Q2 2026

Institutions Reporting

210

Shares (Excl. Options)

150.05MFull value: 150,049,737 · shares · 30 Jun 2026

Price

$3.04

The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.

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Security type / class
Equity / Common stock, par value $0.0001 per share
Symbol
ALT on Nasdaq
All holders as of 30 Jun 2026
Q2 2026
Total 13F shares
150,049,737
Latest holder snapshot 5 signals
Total 13F value
$456,146,946
Portfolio coverage rank
0%
Share change
+80,782,726
Value change
+$245,573,819
Number of holders
210
Issuer context Names, identifiers, and filing context for this profile. 3 identity fields
Shares outstanding
129,919,091
SEC-reported price per share
$2.43
Insider filing price
$2.43
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source

Key facts

  • ALT - Altimmune, Inc. - Common stock, par value $0.0001 per share is tracked under CUSIP 02155H200.
  • 210 institutions reported positions in Q2 2026.
  • 8 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Holder count moved from 173 to 210 between Q1 2026 and Q2 2026.
  • SEC-reported value moved from
    $213.51MFull value: $213,509,686 · USD · 31 Mar 2026
    to
    $456.15MFull value: $456,146,946 · USD · 30 Jun 2026
    .

Research use

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 210 institutions filings for Q2 2026.

Open SEC evidence

Security key

02155H200

13F reference period

Q2 2026

13F holders

210

13D/G owners

8

CIK / CUSIP context first

Open Q2 2026 holders ALT full holder history Altimmune, Inc. SEC filings Altimmune, Inc. company facts Altimmune, Inc. insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
8
Security
ALT
Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
TCG Crossover GP II, LLC 9.8% $67,600,000 20,000,000 Chen Yu 24 Apr 2026
Deep Track Capital, LP 10% $59,805,041 19,417,221 Deep Track Capital, LP 23 Apr 2026
VIKING GLOBAL INVESTORS LP 6.7% $45,292,000 13,400,000 VIKING GLOBAL INVESTORS LP 24 Apr 2026
RA CAPITAL MANAGEMENT, L.P. 6.5% $43,940,000 13,000,000 RA Capital Management, L.P. 24 Apr 2026
STATE STREET CORP 5.5% $24,151,959 7,145,550 STATE STREET CORPORATION 31 Mar 2026
BlackRock, Inc. 7.6% -12% $23,736,362 -$100,148 6,133,427 -0.42% BlackRock, Inc. 30 Jun 2025
AMERIPRISE FINANCIAL INC 1.9% -79% $7,306,296 -$19,283,488 1,443,932 -73% Ameriprise Financial, Inc. 31 Mar 2025
TANG CAPITAL MANAGEMENT LLC 0.3% $2,251,154 666,022 TANG CAPITAL MANAGEMENT, LLC 31 Mar 2026
As of 30 Jun 2026, 210 institutional investors reported holding
150.05MFull value: 150,049,737 · shares · 30 Jun 2026
shares of Altimmune, Inc. - Common stock, par value $0.0001 per share (ALT). This represents 115% of the company’s total
129.92MFull value: 129,919,091 · shares · Stored outstanding share count
outstanding shares.

13F concentration

Top 25 institutional shareholders

Largest 13F positions for this security by reported shares and value.

Top holder share
101%
Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 16% 20,385,284 +59% 0% $61,971,264
Deep Track Capital, LP 15% 19,250,000 0.86% $58,520,000
STATE STREET CORP 9.3% 12,098,540 +69% 0% $36,779,562
TCG Crossover Management, LLC 7.7% 10,000,000 0.73% $30,400,000
VANGUARD CAPITAL MANAGEMENT LLC 6.3% 8,177,752 +45% 0% $24,860,366
VANGUARD PORTFOLIO MANAGEMENT LLC 5.6% 7,330,265 +36% 0% $22,284,006
MARSHALL WACE, LLP 5.3% 6,841,055 +70% 0.02% $20,796,808
VIKING GLOBAL INVESTORS LP 5.2% 6,700,000 0.06% $20,368,000
RA CAPITAL MANAGEMENT, L.P. 5% 6,500,000 0.17% $19,760,000
GEODE CAPITAL MANAGEMENT, LLC 3.9% 5,011,314 +61% 0% $15,238,163
Woodline Partners LP 2.6% 3,400,312 0.03% $10,336,948
MILLENNIUM MANAGEMENT LLC 2.5% 3,309,122 +1.6% 0.01% $10,059,731
Trails Edge Capital Partners, LP 2% 2,660,000 1.3% $8,086,400
Nuveen, LLC 1.9% 2,405,354 +3% 0% $7,312,276
TWO SIGMA INVESTMENTS, LP 1.8% 2,381,142 -3.9% 0.01% $7,238,672
GOLDMAN SACHS GROUP INC 1.7% 2,214,450 +64% 0% $6,731,928
GREAT POINT PARTNERS LLC 1.3% 1,741,232 1.2% $5,293,345
NORTHERN TRUST CORP 1.2% 1,599,226 +60% 0% $4,861,648
Weiss Asset Management LP 1.2% 1,530,803 0.05% $4,653,641
Nantahala Capital Management, LLC 1.2% 1,500,000 0.28% $4,560,000
VANGUARD FIDUCIARY TRUST CO 1% 1,293,001 +49% 0% $3,930,723
Cormorant Asset Management, LP 0.96% 1,250,000 0.2% $3,800,000
AQR CAPITAL MANAGEMENT LLC 0.94% 1,220,949 +1329% 0% $3,711,686
CITADEL ADVISORS LLC 0.76% 983,559 +119% 0% $2,990,019
UBS Group AG 0.67% 866,385 -4.2% 0% $2,633,810

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
33
Headline period
Q2 2026
Rows shown
1-25 of 33
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q3 2,003,677 $5,736,739 +$218,305 $2.86 34
2026 Q2 150,049,737 $456,146,946 +$245,573,819 $3.04 210
2026 Q1 69,370,793 $213,509,686 +$33,127,413 $3.08 173
2025 Q4 54,848,617 $198,060,728 +$47,375,320 $3.61 182
2025 Q3 41,476,255 $156,373,200 +$14,303,174 $3.77 157
2025 Q2 37,594,851 $145,435,659 -$6,199,092 $3.87 179
2025 Q1 38,134,819 $190,969,777 -$15,358,703 $5.00 173
2024 Q4 40,453,394 $291,649,491 +$7,414,850 $7.21 180
2024 Q3 39,490,913 $242,642,286 -$19,754,298 $6.14 167
2024 Q2 42,376,353 $281,796,522 -$21,723,923 $6.65 173
2024 Q1 44,351,359 $451,471,154 +$108,533,821 $10.18 166
2023 Q4 33,518,969 $377,122,817 +$87,837,677 $11.25 142
2023 Q3 30,119,653 $78,312,976 -$14,266,982 $2.60 110
2023 Q2 35,266,907 $124,503,782 -$30,995,734 $3.53 118
2023 Q1 40,146,839 $169,418,214 -$115,027,226 $4.22 129
2022 Q4 46,782,400 $769,520,216 +$29,466,534 $16.45 122
2022 Q3 46,027,433 $587,716,469 +$80,574,668 $12.77 116
2022 Q2 39,903,915 $466,872,641 +$78,793,572 $11.70 102
2022 Q1 33,651,643 $207,371,526 +$5,868,022 $6.09 96
2021 Q4 32,470,413 $295,787,573 -$27,220,088 $9.16 98
2021 Q3 32,076,209 $363,055,937 +$59,058,531 $11.31 113
2021 Q2 27,191,172 $267,846,675 +$16,710,421 $9.85 102
2021 Q1 23,819,490 $336,535,131 +$49,552,065 $14.13 92
2020 Q4 20,471,521 $230,916,860 -$28,712,052 $11.28 83
2020 Q3 21,898,188 $289,049,000 +$115,723,197 $13.20 67
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