United States Pharmaceuticals

Assembly Biosciences Inc (ASMB)

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Over the past 90 days, Assembly Biosciences Inc. recorded one insider transaction, consisting of a sale valued at $674.25 by an executive. This activity follows a period of broader selling by company officers. The stock has declined 15% over the last quarter, with the next earnings report scheduled for August 2026.
Ticker: ASMB Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Assembly Biosciences Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Sale 17 Jun 2026
Value US$591,079.61 | Price 14.44 | Shares 25,396 (+31.0%)
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-18 2026-06-17 S Sale
2.7
Bjorkquist Jeanette M

PFO and PAO

Officer
25,396 +31.0%
14.44
US$591,080 		25,396 +31.0% 14.44 US$591,080
2026-03-31 2026-03-30 S Sale
2.7
Bjorkquist Jeanette M

PFO and PAO

Officer
29,762 +4.3%
401.12
US$1,690,263 		29,762 +4.3% 401.12 US$1,690,263
2026-03-31 2026-03-30 S Sale
2.7
Bjorkquist Jeanette M

PFO and PAO

Officer
23,372 +46.4%
106.07
US$3,662,067 		23,372 +46.4% 106.07 US$3,662,067
2026-03-31 2026-03-30 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
9 -0.0%
27.49
US$247 		9 -0.0% 27.49 US$247
2026-03-31 2026-03-30 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
188 -0.5%
26.65
US$5,010 		188 -0.5% 26.65 US$5,010
2025-04-15 2025-03-31 S Sale
2.2
McHutchison John G
Non-Executive Director
757 -4.0%
9.85
US$7,455 		757 -4.0% 9.85 US$7,455
2025-04-01 2025-03-31 PlS Planned sale
2.5
Okazaki Jason A

CEO and President

Executive Director
355 -2.3%
9.85
US$3,496 		355 -2.3% 9.85 US$3,496
2025-04-01 2025-03-31 S Sale
2.7
Bjorkquist Jeanette M

Principal Accounting Officer

Officer
180 -3.8%
9.85
US$1,773 		180 -3.8% 9.85 US$1,773
2025-04-01 2025-03-31 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
197 -1.7%
9.85
US$1,940 		197 -1.7% 9.85 US$1,940
2024-12-31 2024-12-30 B Purchase
0.6
Houghton Michael
Non-Executive Director
3,202 +inf%
15.61
US$49,998 		3,202 +inf% 15.61 US$49,998
2024-12-23 2024-12-19 B Purchase
1.3
GILEAD SCIENCES, INC.
Large shareholder
940,499 +74.1%
21.37
US$20,098,464 		940,499 +74.1% 21.37 US$20,098,464
2024-11-26 2024-11-25 B Purchase
4.0
Schornstein Alexander
Large shareholder
5,000 +0.7%
14.85
US$74,250 		5,000 +0.7% 14.85 US$74,250
2024-11-26 2024-11-25 B Purchase
4.0
Schornstein Alexander
Large shareholder
2,976 +0.4%
15.00
US$44,640 		2,976 +0.4% 15.00 US$44,640
2024-11-26 2024-11-22 B Purchase
4.0
Schornstein Alexander
Large shareholder
17,024 +2.4%
14.87
US$253,104 		17,024 +2.4% 14.87 US$253,104
2024-11-19 2024-11-18 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
40 -0.3%
16.29
US$652 		40 -0.3% 16.29 US$652
2024-10-09 2024-10-08 B Purchase
4.0
Schornstein Alexander
Large shareholder
10,000 +1.4%
14.58
US$145,800 		10,000 +1.4% 14.58 US$145,800
2024-10-04 2024-10-03 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
197 -1.3%
14.81
US$2,918 		197 -1.3% 14.81 US$2,918
2024-10-04 2024-10-03 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
157 -1.3%
14.81
US$2,325 		157 -1.3% 14.81 US$2,325
2024-08-05 2024-08-02 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
785 -6.1%
14.23
US$11,173 		785 -6.1% 14.23 US$11,173
2024-08-05 2024-08-02 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
981 -6.1%
14.23
US$13,962 		981 -6.1% 14.23 US$13,962
2024-07-08 2024-07-05 B Purchase
4.0
Schornstein Alexander
Large shareholder
4,438 +0.6%
12.52
US$55,564 		4,438 +0.6% 12.52 US$55,564
2024-07-08 2024-07-03 B Purchase
4.0
Schornstein Alexander
Large shareholder
4,562 +0.7%
12.29
US$56,067 		4,562 +0.7% 12.29 US$56,067
2024-05-24 2024-05-23 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
172 -1.3%
14.93
US$2,569 		172 -1.3% 14.93 US$2,569
2024-05-24 2024-05-23 PlS Planned sale
2.5
Okazaki Jason A

CEO and President

Executive Director
549 -3.3%
14.93
US$8,199 		549 -3.3% 14.93 US$8,199
2024-05-24 2024-05-23 S Sale
2.7
Bjorkquist Jeanette M

Principal Accounting Officer

Officer
24 -0.8%
14.93
US$358 		24 -0.8% 14.93 US$358
2024-05-24 2024-05-23 S Sale
2.2
McHutchison John G
Non-Executive Director
2,117 -10.0%
14.93
US$31,615 		2,117 -10.0% 14.93 US$31,615
2024-05-01 2024-04-30 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
1,569 -8.7%
12.71
US$19,937 		1,569 -8.7% 12.71 US$19,937
2024-05-01 2024-04-30 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
1,255 -8.8%
12.71
US$15,947 		1,255 -8.8% 12.71 US$15,947
2024-04-02 2024-04-01 S Sale
2.7
Bjorkquist Jeanette M

Principal Accounting Officer

Officer
114 -3.5%
13.07
US$1,490 		114 -3.5% 13.07 US$1,490
2024-04-02 2024-04-01 S Sale
2.2
McHutchison John G
Non-Executive Director
1,206 -5.4%
13.07
US$15,765 		1,206 -5.4% 13.07 US$15,765
2024-04-02 2024-04-01 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
197 -1.8%
13.07
US$2,575 		197 -1.8% 13.07 US$2,575
2024-04-02 2024-04-01 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
354 -2.5%
13.07
US$4,627 		354 -2.5% 13.07 US$4,627
2024-03-29 2024-03-27 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
392 -2.7%
12.87
US$5,045 		392 -2.7% 12.87 US$5,045
2024-01-19 2024-01-18 B Purchase
4.0
Schornstein Alexander
Large shareholder
345,086 +4.4%
0.80
US$276,069 		345,086 +4.4% 0.80 US$276,069
2024-01-19 2024-01-17 B Purchase
4.0
Schornstein Alexander
Large shareholder
299,994 +4.0%
0.78
US$235,195 		299,994 +4.0% 0.78 US$235,195
2023-11-22 2023-11-21 B Purchase
4.0
Schornstein Alexander
Large shareholder
100,000 +1.3%
0.67
US$66,700 		100,000 +1.3% 0.67 US$66,700
2023-11-22 2023-11-20 B Purchase
4.0
Schornstein Alexander
Large shareholder
300,000 +4.2%
0.72
US$215,400 		300,000 +4.2% 0.72 US$215,400
2023-11-21 2023-11-17 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
477 -0.5%
0.69
US$329 		477 -0.5% 0.69 US$329
2023-10-04 2023-10-03 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
2,363 -1.3%
0.80
US$1,879 		2,363 -1.3% 0.80 US$1,879
2023-10-04 2023-10-03 S Sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
1,891 -1.2%
0.80
US$1,504 		1,891 -1.2% 0.80 US$1,504
2023-10-04 2023-10-03 S Sale
2.2
White Nicole S

Chief Manufacturing Officer

Officer
1,891 -2.0%
0.80
US$1,504 		1,891 -2.0% 0.80 US$1,504
2023-10-03 2023-10-03 PrS Proposed sale
3.2
William E. Delaney IV

Officer

Officer
1,891
0.85
US$1,607 		1,891 0.85 US$1,607
2023-10-03 2023-10-03 PrS Proposed sale
2.5
Jason A. Okazaki

Officer; Director

Executive Director
2,363
0.85
US$2,009 		2,363 0.85 US$2,009
2023-08-03 2023-08-02 S Sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
9,461 -6.2%
1.09
US$10,293 		9,461 -6.2% 1.09 US$10,293
2023-08-03 2023-08-02 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
11,827 -6.7%
1.09
US$12,867 		11,827 -6.7% 1.09 US$12,867
2023-08-02 2023-08-02 PrS Proposed sale
2.5
Jason Okazaki

Officer; Director

Executive Director
11,827
1.09
US$12,867 		11,827 1.09 US$12,867
2023-08-02 2023-08-02 PrS Proposed sale
3.2
William E. Delaney IV

Officer

Officer
9,461
1.09
US$10,293 		9,461 1.09 US$10,293
2023-07-25 2023-07-24 S Sale
2.7
Bjorkquist Jeanette M

Principal Accounting Officer

Officer
844 -3.1%
1.07
US$900 		844 -3.1% 1.07 US$900
2023-05-31 2023-05-30 S Sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
4,232 -3.6%
0.96
US$4,046 		4,232 -3.6% 0.96 US$4,046
2023-05-30 2023-05-30 PrS Proposed sale
3.2
William E. Delaney IV

Officer

Officer
4,232
0.96
US$4,046 		4,232 0.96 US$4,046
2023-05-24 2023-05-23 S Sale
2.7
Bjorkquist Jeanette M

Principal Accounting Officer

Officer
274 -1.0%
1.04
US$285 		274 -1.0% 1.04 US$285
2023-05-24 2023-05-23 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
6,561 -4.9%
1.04
US$6,825 		6,561 -4.9% 1.04 US$6,825
2023-05-24 2023-05-23 S Sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
6,561 -5.3%
1.04
US$6,825 		6,561 -5.3% 1.04 US$6,825
2023-05-24 2023-05-23 S Sale
2.2
McHutchison John G
Non-Executive Director
25,972 -13.3%
1.04
US$27,019 		25,972 -13.3% 1.04 US$27,019
2023-05-23 2023-05-23 PrS Proposed sale
3.2
William E. Delaney IV

Officer

Officer
6,561
1.04
US$6,825 		6,561 1.04 US$6,825
2023-05-23 2023-05-23 PrS Proposed sale
2.5
Jason Okazaki

Officer; Director

Executive Director
6,561
1.04
US$6,825 		6,561 1.04 US$6,825
2023-05-23 2023-05-23 PrS Proposed sale
2.2
John G. McHutchison

Director

Non-Executive Director
25,972
1.04
US$27,019 		25,972 1.04 US$27,019
2023-03-28 2023-03-27 S Sale
2.5
Okazaki Jason A

CEO and President

Executive Director
4,693 -4.4%
1.02
US$4,785 		4,693 -4.4% 1.02 US$4,785
2022-08-10 2022-08-08 PlS Planned sale
2.2
McHutchison John G

Chief Executive Officer

Executive Director
12,314 -6.0%
2.13
US$26,200 		12,314 -6.0% 2.13 US$26,200
2022-07-26 2022-07-25 PlS Planned sale
Samar Michael P.

Chief Financial Officer

Officer
2,020 -2.5%
2.22
US$4,479 		2,020 -2.5% 2.22 US$4,479
2022-06-02 2022-05-31 PlS Planned sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
4,164 -5.2%
1.92
US$8,005 		4,164 -5.2% 1.92 US$8,005
2022-03-29 2022-03-28 PlS Planned sale
2.5
Okazaki Jason A

Chief Operating Officer

Officer
4,617 -6.7%
2.24
US$10,363 		4,617 -6.7% 2.24 US$10,363
2021-06-01 2021-05-27 PlS Planned sale
3.2
Delaney William E IV

Chief Scientific Officer

Officer
4,129 -7.2%
4.03
US$16,637 		4,129 -7.2% 4.03 US$16,637
2020-12-15 2020-12-14 PlS Planned sale
Papkoff Jacqueline Sybil

SVP-CSO Microbiome

Officer
1,297 -3.4%
6.15
US$7,983 		1,297 -3.4% 6.15 US$7,983
2020-11-10 2020-11-09 PlS Planned sale
Stamm Luisa M

Chief Medical Officer

Officer
4,397 -36.6%
5.10
US$22,404 		4,397 -36.6% 5.10 US$22,404
2020-08-10 2020-08-07 PlS Planned sale
2.2
McHutchison John G

CEO and President

Executive Director
756 -0.5%
22.50
US$17,010 		756 -0.5% 22.50 US$17,010
2020-08-10 2020-08-07 PlS Planned sale
2.2
McHutchison John G

CEO and President

Executive Director
11,395 -7.6%
21.76
US$247,907 		11,395 -7.6% 21.76 US$247,907
2020-03-31 2020-03-31 PlS Planned sale
Colonno Richard James

EVP & CSO, Virology Ops

Officer
7,812 -5.4%
15.04
US$117,524 		7,812 -5.4% 15.04 US$117,524
2020-03-31 2020-03-30 PlS Planned sale
Papkoff Jacqueline Sybil

SVP-CSO Microbiome

Officer
1,254 -3.1%
14.22
US$17,831 		1,254 -3.1% 14.22 US$17,831
2019-12-16 2019-12-13 PlS Planned sale Papkoff Jacqueline Sybil

SVP-CSO Microbiome

Officer
1,460 -6.0%
21.00
US$30,662 		1,460 -6.0% 21.00 US$30,662
2019-12-16 2019-12-12 PlS Planned sale Colonno Richard James

EVP & CSO, Virology Ops

Officer
33,061 -20.5%
25.00
US$826,578 		33,061 -20.5% 25.00 US$826,578
2018-09-07 2018-09-06 PlS Planned sale Lopatin Uri A

Chief Med. Off., VP Res. Dev.

Officer
336 -0.1%
40.01
US$13,442 		336 -0.1% 40.01 US$13,442
2018-09-07 2018-09-05 PlS Planned sale Lopatin Uri A

Chief Med. Off., VP Res. Dev.

Officer
15,204 -2.4%
40.09
US$609,547 		15,204 -2.4% 40.09 US$609,547
2018-07-20 2018-07-19 B Purchase Small Derek A

CEO and President

Executive Director
1,200 +0.2%
41.77
US$50,123 		1,200 +0.2% 41.77 US$50,123
2018-07-20 2018-07-19 B Purchase Small Derek A

CEO and President

Executive Director
1,200 +0.2%
41.19
US$49,428 		1,200 +0.2% 41.19 US$49,428
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