Altimmune, Inc. (ALT) ownership: Top institutional holder: BlackRock, Inc. ($39.41M). Insider activity: Net Seller (2 buys, 18 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 12795277.00 | $39.41M | 2026-03-31 |
| VANGUARD GROUP INC | 9491159.00 | $34.26M | 2025-12-31 |
| STATE STREET CORP | 7145550.00 | $22.01M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 5658049.00 | $17.43M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5382002.00 | $16.58M | 2026-03-31 |
| MARSHALL WACE, LLP | 4017901.00 | $12.38M | 2026-03-31 |
| MILLENNIUM MANAGEMENT LLC | 3258191.00 | $10.04M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 3107096.00 | $9.57M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 | |
| Sell | null | 2026-05-01 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.