ASMB
ASSEMBLY BIO (ASMB)
NASDAQ
$20.28-$0.18 (-0.88%)
Price as of Oct 22, 2026 7:30 PM EDT
  • $416.6M
    Market Cap
  • -27.32%
    1-Year Change
  • Biotechnology
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
GILEAD SCIENCES, INC.
24.44%
5.0M
+471,698 (+9.48%)
Jun 30, 2026
SATTER MANAGEMENT CO., L.P.
10.94%
2.2M
0 (0.00%)
Jun 30, 2022
CANDRIAM LUXEMBOURG S.C.A.
9.03%
1.8M
+369,375 (+20.09%)
Dec 31, 2021
FARALLON CAPITAL MANAGEMENT LLC
7.88%
1.6M
+377,000 (+23.50%)
Jun 30, 2026
FARALLON CAPITAL MANAGEMENT, L.L.C.
7.88%
1.6M
+377,000 (+23.50%)
Jun 30, 2026
PARADIGM BIOCAPITAL ADVISORS LP
7.63%
1.6M
+888,497 (+57.18%)
Jun 30, 2026
COMMODORE CAPITAL LP
6.95%
1.4M
+415,000 (+29.33%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions206.2M (62.81%)
  • Mutual Funds113.7M (34.64%)
  • Insiders8.4M (2.55%)
  • Other0 (0.00%)

Insider Transactions

  • 2.55% (8.4M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 1
    Number of InsiderSelling (last 12 months)
  • $592,032.38
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Bjorkquist Jeanette M
PFO and PAO
Sell
Mar 30, 2026
$8,314.86
312
$26.65
11,105
Bjorkquist Jeanette M
PFO and PAO
Sell
Mar 30, 2026
$439.84
16
$27.49
11,089
Okazaki Jason A
CEO and President
Award
Mar 29, 2026
$0.00
94,250
$0.00
111,916
Delaney William E IV
Chief Scientific Officer
Award
Mar 29, 2026
$0.00
26,000
$0.00
45,642
Gaggar Anuj
Chief Medical Officer
Award
Mar 29, 2026
$0.00
26,000
$0.00
28,000
Bjorkquist Jeanette M
PFO and PAO
Award
Mar 29, 2026
$0.00
6,500
$0.00
11,417
GILEAD SCIENCES INC
Buy
Aug 08, 2025
$0.00
1.1M
$0.00
1.1M
GILEAD SCIENCES INC
Buy
Aug 08, 2025
$0.00
1.1M
$0.00
1.1M
GILEAD SCIENCES INC
Buy
Aug 08, 2025
$0.00
2.3M
$0.00
4.5M
Bjorkquist Jeanette M
PFO and PAO
Award
Jun 16, 2025
$0.00
600
$0.00
600
Bjorkquist Jeanette M
PFO and PAO
Award
Jun 16, 2025
$0.00
300
$0.00
5,097
ALTIG ANTHONY E
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
Houghton Michael
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
Johnson-Pratt Lisa
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
Consylman Gina
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
Mahony Susan
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
RINGO WILLIAM R
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
McHutchison John G
Award
Jun 05, 2025
$0.00
3,500
$0.00
3,500
McHutchison John G
Sell
Mar 31, 2025
$7,455.01
757
$9.85
18,347
Okazaki Jason A
CEO and President
Sell
Mar 31, 2025
$3,496.08
355
$9.85
14,757
White Nicole S
Chief Manufacturing Officer
Sell
Mar 31, 2025
$1,940.08
197
$9.85
11,674
Bjorkquist Jeanette M
Principal Accounting Officer
Sell
Mar 31, 2025
$1,772.66
180
$9.85
4,617
Gaggar Anuj
Chief Medical Officer
Award
Mar 29, 2025
$0.00
24,200
$0.00
24,200
Delaney William E IV
Chief Scientific Officer
Award
Mar 29, 2025
$0.00
25,500
$0.00
25,500
White Nicole S
Chief Manufacturing Officer
Award
Mar 29, 2025
$0.00
20,400
$0.00
20,400
Okazaki Jason A
CEO and President
Award
Mar 29, 2025
$0.00
71,100
$0.00
71,100
Bjorkquist Jeanette M
Principal Accounting Officer
Award
Mar 29, 2025
$0.00
1,900
$0.00
1,900
Bjorkquist Jeanette M
Principal Accounting Officer
Award
Mar 29, 2025
$0.00
1,655
$0.00
4,797
GILEAD SCIENCES INC
Buy
Dec 19, 2024
$20.1M
940,499
$21.37
2.2M
White Nicole S
Chief Manufacturing Officer
Sell
Nov 18, 2024
$651.60
40
$16.29
11,871