Assembly Biosciences, Inc. (ASMB) has 20 known insider and institutional holders on record. The largest holder is Zlotnick Adam with 1,321,009 shares. Other notable holders include GILEAD SCIENCES, INC. and Small Derek A.
Over the last 12 months, insiders have made 17 transactions in ASMB stock — 14 buys (valued at $25.19M) and 3 sells (valued at $8.14K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
ASMB Insider Ownership
Top Holder
Zlotnick Adam
1,321,009 shares
Buys (12 mo)
14
$25.19M value
Sells (12 mo)
3
$8.14K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Zlotnick Adam |
10 Percent Owner |
1,321,009 |
2014-09-09 |
|
| 2 |
Gilead Sciences, Inc. |
10 Percent Owner |
1,147,960 |
2025-10-03 |
|
| 3 |
Small Derek A |
Director |
828,791 |
2020-01-03 |
|
| 4 |
Schornstein Alexander |
10 Percent Owner |
720,137 |
2024-11-26 |
|
| 5 |
Ellison Russell H |
Director |
533,333 |
2015-04-15 |
|
| 6 |
Okazaki Jason A |
CEO and President |
111,916 |
2026-03-31 |
|
| 7 |
Samar Michael P. |
Chief Financial Officer |
77,228 |
2022-07-26 |
|
| 8 |
Russo Thomas Joseph |
CFO |
54,633 |
2021-04-02 |
|
| 9 |
Delaney William E Iv |
Chief Scientific Officer |
45,642 |
2026-03-31 |
|
| 10 |
White Nicole S |
Chief Manufacturing Officer |
37,674 |
2026-03-31 |
|
| 11 |
Papkoff Jacqueline Sybil |
SVP-CSO Microbiome |
37,364 |
2020-12-15 |
|
| 12 |
Cooper Graham K |
See Remarks |
35,000 |
2019-04-02 |
|
| 13 |
Colonno Richard James |
EVP & CSO, Virology Ops |
34,000 |
2020-03-31 |
|
| 14 |
Rowland Thomas Andrew |
Chief Business Officer |
30,000 |
2012-01-18 |
|
| 15 |
Gaggar Anuj |
Chief Medical Officer |
28,000 |
2026-03-31 |
|
| 16 |
Lopatin Uri A |
Chief Medical Officer |
27,500 |
2019-04-02 |
|
| 17 |
Barrett David Jonathan |
See Remarks |
25,000 |
2017-03-31 |
|
| 18 |
Stamm Luisa M |
Chief Medical Officer |
22,500 |
2022-03-31 |
|
| 19 |
Dimarchi Richard D |
Director |
20,000 |
2022-05-27 |
|
| 20 |
Holubiak Myron Z |
Director |
15,000 |
2021-05-24 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-29 |
Gaggar Anuj |
Chief Medical Officer |
RSU Award |
26,000 |
- |
- |
| 2026-03-30 |
White Nicole S |
Chief Manufacturing Officer |
Informative Sell |
9 |
$27.49 |
$247.41 |
| 2026-03-29 |
White Nicole S |
Chief Manufacturing Officer |
RSU Award |
26,000 |
- |
- |
| 2026-03-30 |
Bjorkquist Jeanette M |
Pfo and Pao |
Informative Sell |
16 |
$27.49 |
$439.84 |
| 2026-03-29 |
Bjorkquist Jeanette M |
Pfo and Pao |
RSU Award |
6,500 |
- |
- |
| 2026-03-29 |
Delaney William E Iv |
Chief Scientific Officer |
RSU Award |
26,000 |
- |
- |
| 2026-03-29 |
Okazaki Jason A |
CEO and President |
RSU Award |
94,250 |
- |
- |
| 2025-08-08 |
Gilead Sciences, Inc. |
10 Percent Owner |
Informative Buy |
1,147,960 |
$21.60 |
$24.8M |
| 2025-06-16 |
Bjorkquist Jeanette M |
Pfo and Pao |
RSU Award |
600 |
$17.24 |
$10.34K |
| 2025-06-05 |
Houghton Michael |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Johnson-pratt Lisa |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Mchutchison John G |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Consylman Gina |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Mahony Susan |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Ringo William R |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-06-05 |
Altig Anthony E |
Director |
RSU Award |
3,500 |
$15.81 |
$55.34K |
| 2025-03-31 |
Mchutchison John G |
Director |
Informative Sell |
757 |
$9.85 |
$7.46K |
