Latest Period
Q1 2026
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 Q1 2026
Institutions Reporting
172
Shares (Excl. Options)
69,304,673
Price
$3.08
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- Security type / class
- Equity / Common stock, par value $0.0001 per share
- Symbol
- ALT on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 69,304,673
- Total 13F value
- $213,335,129
- Portfolio coverage rank
- 0%
- Share change
- +11,725,279
- Value change
- +$33,730,450
- Number of holders
- 172
- Shares outstanding
- 129,919,091
- SEC-reported price per share
- $3.04
- Insider filing price
- $3.04
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ALT - Altimmune, Inc. - Common stock, par value $0.0001 per share is tracked under CUSIP 02155H200.
- 172 institutions reported positions in Q1 2026.
- 8 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 182 to 172 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $198,060,728 to $213,335,129.
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
Open SEC evidence
Latest holder context comes from 172 institutions filings for Q1 2026.
Security key
02155H200
Latest holder period
Q1 2026
13F holders
172
13D/G owners
8
CIK / CUSIP context first
Open Q1 2026 holders
ALT full holder history
Altimmune, Inc. SEC filings
Altimmune, Inc. company facts
Altimmune, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 02155H200:
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 31 Mar 2026, 172 institutional investors reported holding 69,304,673 shares of Altimmune, Inc. - Common stock, par value $0.0001 per share (ALT). This represents 53% of the company’s total 129,919,091 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
47%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 9.8% | 12,795,277 | +32% | 0% | $39,409,453 |
| STATE STREET CORP | 5.5% | 7,145,550 | +40% | 0% | $22,008,294 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.4% | 5,658,049 | 0% | 0% | $17,426,791 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.1% | 5,382,002 | 0% | 0% | $16,576,566 |
| MARSHALL WACE, LLP | 3.1% | 4,017,901 | +335% | 0.01% | $12,375,135 |
| MILLENNIUM MANAGEMENT LLC | 2.5% | 3,258,191 | +1471% | 0.01% | $10,035,228 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.4% | 3,107,096 | +36% | 0% | $9,572,306 |
| Alyeska Investment Group, L.P. | 2% | 2,644,600 | 0.02% | $8,145,368 | |
| TWO SIGMA INVESTMENTS, LP | 1.9% | 2,478,900 | +96% | 0.01% | $7,635,012 |
| Nuveen, LLC | 1.8% | 2,334,601 | +88% | 0% | $7,190,571 |
| GOLDMAN SACHS GROUP INC | 1% | 1,350,649 | +0.1% | 0% | $4,159,999 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1% | 1,325,956 | -3.1% | 0.01% | $4,083,944 |
| DIMENSIONAL FUND ADVISORS LP | 0.81% | 1,045,926 | +269% | 0% | $3,220,757 |
| NORTHERN TRUST CORP | 0.77% | 996,721 | +39% | 0% | $3,069,900 |
| UBS Group AG | 0.7% | 904,768 | +41% | 0% | $2,786,685 |
| VANGUARD FIDUCIARY TRUST CO | 0.67% | 869,318 | 0% | 0% | $2,677,499 |
| MORGAN STANLEY | 0.6% | 775,258 | -43% | 0% | $2,387,794 |
| D. E. Shaw & Co., Inc. | 0.56% | 727,001 | -46% | 0% | $2,239,163 |
| FMR LLC | 0.52% | 673,964 | +19% | 0% | $2,075,808 |
| SCHRODER INVESTMENT MANAGEMENT GROUP | 0.51% | 667,837 | +42% | 0% | $1,923,371 |
| TANG CAPITAL MANAGEMENT LLC | 0.51% | 666,022 | -69% | 0.1% | $2,051,348 |
| Point72 Asset Management, L.P. | 0.51% | 665,289 | 0% | $2,049,090 | |
| BANK OF AMERICA CORP /DE/ | 0.44% | 570,203 | +49% | 0% | $1,756,225 |
| CITADEL ADVISORS LLC | 0.35% | 448,873 | -66% | 0% | $1,382,528 |
| BNP PARIBAS FINANCIAL MARKETS | 0.33% | 435,078 | 0% | 0% | $1,340,040 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
31
Latest
Q1 2026
Rows shown
1-25 of 31
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 69,304,673 | $213,335,129 | +$33,730,450 | $3.08 | 172 |
| 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 |
| 2020 Q2 | 13,311,955 | $142,567,171 | +$125,471,540 | $10.71 | 53 |
| 2020 Q1 | 1,583,373 | $5,082,210 | +$1,206,160 | $3.21 | 20 |