ALT
ALTIMMUNE (ALT)
NASDAQ
$2.20-$0.04 (-1.57%)
Price as of Oct 22, 2026 7:57 PM EDT
  • $433.8M
    Market Cap
  • -42.82%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
BLACKROCK, INC.
10.48%
20.4M
+7.6M (+37.23%)
Jun 30, 2026
DEEP TRACK CAPITAL, LP
9.90%
19.3M
+19.3M (+100.00%)
Jun 30, 2026
STATE STREET CORP
6.22%
12.1M
+5.0M (+40.94%)
Jun 30, 2026
TCG CROSSOVER MANAGEMENT, LLC
5.14%
10.0M
+10.0M (+100.00%)
Jun 30, 2026
VANGUARD GROUP INC
4.88%
9.5M
+3.1M (+32.85%)
Dec 31, 2025
VANGUARD CAPITAL MANAGEMENT LLC
4.20%
8.2M
+2.5M (+30.81%)
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
3.77%
7.3M
+1.9M (+26.58%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions926.5M (70.53%)
  • Mutual Funds350.2M (26.66%)
  • Insiders36.9M (2.81%)
  • Other0 (0.00%)

Insider Transactions

  • 2.81% (36.9M)
    Current InsiderOwnership (%, shares)
  • 5
    Number of InsiderBuying (last 12 months)
  • $349,472.85
    Amount of InsiderBuying (last 12 months)
  • 0
    Number of InsiderSelling (last 12 months)
  • $0.00
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
MENZIUSO RICHARD THOMAS
Principal Accounting Officer
Award
Oct 01, 2026
$0.00
84,546
$0.00
84,546
Arbet-Engels Christophe
Chief Medical Officer
Exempt
Oct 01, 2026
$0.00
37,500
$0.00
112,500
MENZIUSO RICHARD THOMAS
Principal Accounting Officer
Award
Oct 01, 2026
$0.00
36,234
$0.00
36,234
WEAVER GREGORY L
Chief Financial Officer
Exempt
Oct 01, 2026
$0.00
14,475
$0.00
43,425
Arbet-Engels Christophe
Chief Medical Officer
Exempt
Oct 01, 2026
$0.00
37,500
$0.00
37,500
WEAVER GREGORY L
Chief Financial Officer
Exempt
Oct 01, 2026
$0.00
14,475
$0.00
54,306
Arbet-Engels Christophe
Chief Medical Officer
In Kind
Oct 01, 2026
$34,994.04
12,679
$2.76
24,821
WEAVER GREGORY L
Chief Financial Officer
In Kind
Oct 01, 2026
$12,086.04
4,379
$2.76
49,927
Roberts M Scot
Chief Scientific Officer
Award
Jul 31, 2026
$2,112.25
875
$2.41
113,699
WEAVER GREGORY L
Chief Financial Officer
Award
Jul 31, 2026
$4,231.74
1,753
$2.41
39,831
GILL JOHN
Buy
Apr 06, 2026
$31,349.92
9,200
$3.41
21,700
Durso Jerome Benedict
President and CEO
Buy
Apr 01, 2026
$47,100.00
15,000
$3.14
47,500
WEAVER GREGORY L
Chief Financial Officer
Buy
Apr 01, 2026
$31,499.00
10,000
$3.15
38,078
WEAVER GREGORY L
Chief Financial Officer
Buy
Mar 06, 2026
$17,700.00
5,000
$3.54
28,078
Roberts M Scot
Chief Scientific Officer
Award
Feb 26, 2026
$0.00
222,670
$0.00
222,670
Roberts M Scot
Chief Scientific Officer
Award
Feb 26, 2026
$0.00
95,430
$0.00
95,430
Roberts M Scot
Chief Scientific Officer
Exempt
Feb 02, 2026
$0.00
7,775
$0.00
0
Roberts M Scot
Chief Scientific Officer
Exempt
Feb 02, 2026
$0.00
7,775
$0.00
115,153
Roberts M Scot
Chief Scientific Officer
In Kind
Feb 02, 2026
$12,925.95
2,329
$5.55
112,824
Jordt Raymond M
Chief Business Officer
Award
Jan 31, 2026
$14,032.97
4,571
$3.07
70,107
Roberts M Scot
Chief Scientific Officer
Award
Jan 31, 2026
$17,090.69
5,567
$3.07
107,378
Garg Vipin K
Award
Jan 31, 2026
$21,262.82
6,926
$3.07
424,519
Roberts M Scot
Chief Scientific Officer
Exempt
Jan 30, 2026
$0.00
9,275
$0.00
104,670
Garg Vipin K
Exempt
Jan 30, 2026
$0.00
26,775
$0.00
26,775
Roberts M Scot
Chief Scientific Officer
In Kind
Jan 30, 2026
$16,010.40
2,859
$5.60
101,811
Garg Vipin K
Exempt
Jan 30, 2026
$0.00
26,775
$0.00
429,225
Roberts M Scot
Chief Scientific Officer
Exempt
Jan 30, 2026
$0.00
9,275
$0.00
9,275
Garg Vipin K
In Kind
Jan 30, 2026
$65,139.20
11,632
$5.60
417,593
Garg Vipin K
Exempt
Jan 27, 2026
$0.00
41,200
$0.00
123,600
Roberts M Scot
Chief Scientific Officer
Exempt
Jan 27, 2026
$0.00
15,850
$0.00
47,550