Altimmune, Inc. (ALT)
Nasdaq: ALT · Pharmaceutical Preparations · Gaithersburg, MD · filing with the SEC since 2005
Who owns Altimmune, Inc.
As filed with the SECHolders of 5% or more
6
Deep Track Capital, LP holds 9.99% of Common stock, par value $0.0001 per share, as its SCHEDULE 13G filed Apr 30, 2026 says.
Directors and officers
18
report now, of 32 people on the record since 2007. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 6 named at left.
Holders of 5% or moreshare of the class, as filed
Deep Track Capital, LP
SCHEDULE 13G · filed Apr 30, 2026 · Common stock, par value $0.0001 per share
Chen Yu
SCHEDULE 13G · filed May 1, 2026 · Common Stock, par value $0.0001 per share
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 16, 2025 · Common Stock · 8.7% in Feb 5, 2025
Viking Global Investors LP
SCHEDULE 13G · filed May 1, 2026 · Common Stock, par value $0.0001 per share
RA Capital Management, L.P.
SCHEDULE 13G · filed May 1, 2026 · Common Stock, par value $0.0001 per share
State Street Corporation
SCHEDULE 13G · filed May 12, 2026 · COMMON STOCK
Ameriprise Financial, Inc.
SCHEDULE 13G/A · filed May 15, 2025 · Common Stock · reported falling below 5%, from 7.4% in Feb 14, 2025
Tang Capital Management, LLC
SCHEDULE 13G/A · filed May 15, 2026 · Common stock, par value $0.0001 per share · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 9.09% in Jan 30, 2026
What ALT reports owning in othersstakes of 5% or more, and other ties
4 subsidiaries in 3 countries, from the list filed with the 10-K filed Mar 6, 2026.
Insider tradesForm 4
0sales
11purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$400,000bought, in dollars
Open-market trades on Form 4 from Nov 4, 2025 to Nov 4, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Nov 4, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window6 of 51 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Durso Jerome Benedict | President and CEO | 0 | $0 | 0 | 4 | $200,000 |
| Gill John | President and CEO | 0 | $0 | 0 | 2 | $100,000 |
| Weaver Gregory L | Chief Financial Officer | 0 | $0 | 0 | 2 | $0 |
| Jorkasky Diane | director | 0 | $0 | 0 | 1 | $0 |
| Pisano Wayne | director | 0 | $0 | 0 | 1 | $0 |
| Sohn Catherine A. | director | 0 | $0 | 0 | 1 | $0 |