Altimmune, Inc.
ALT- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001326190
In the last 90 days, Altimmune, Inc. insiders filed 1 open-market purchase and 0 sales; 210 institutions reported holding it in 13F filings for Q2 2026, worth $456.1M in total; Viking Global Investors is the only superinvestor holding it.
Holders of 5% or more of ALT
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Altimmune, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 7.60%6.13M shares | −1.10 ppfrom 8.70% | Feb 5, 20252 filings | Jul 16, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
4 Schedule 13D and 13G filings on Altimmune, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jul 16, 20257:02 PM ET | BlackRock, Inc. | 13G/A | 7.60%6.13M shares | −1.10 ppfrom 8.70% | Jun 30, 2025 | SEC |
| May 15, 202511:05 AM ET | Ameriprise Financial Incand 7 others | 13G/A | 1.90%1.44M shares | −5.50 ppfrom 7.40%Below 5% | Mar 31, 2025 | SEC |
| Feb 14, 20252:31 PM ET | Ameriprise Financial Incand 7 others | 13G/A | 7.40%5.25M shares | – | Dec 31, 2024 | SEC |
| Feb 5, 20251:23 PM ET | BlackRock, Inc. | 13G/A | 8.70%6.16M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Altimmune, Inc. shares.
No Form 144 notices for Altimmune, Inc. are on file.