Jason A. Okazaki - 30 Oct 2026 Form 4 Insider Report for ASSEMBLY BIOSCIENCES, INC. (ASMB)

Reporting relationship: CEO and President, Director
Issuer ticker: ASMB
Reported as of: 30 Oct 2026
Net transaction value: -$121,658
SEC form: 4
Accepted by SEC: 03 Nov 2026, 16:30:17 UTC
Prior SEC filing: 31 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ John O. Gunderson, as Attorney-in-Fact

Filing notes and source

Key filing fact

Jason A. Okazaki filed Form 4 for ASSEMBLY BIOSCIENCES, INC. (ASMB) on 03 Nov 2026.

Key facts

This page summarizes Jason A. Okazaki's Form 4 filing for ASSEMBLY BIOSCIENCES, INC. (ASMB).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 03 Nov 2026, 16:30.

Change

Previous filing in this sequence was filed on 31 Mar 2026.
Current net transaction value: -$121,658.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001807214 Primary reporting owner

Okazaki Jason A

Relationship: CEO and President, Director
Address: C/O ASSEMBLY BIOSCIENCES, INC., TWO TOWER PLACE, 7TH FLOOR, SOUTH SAN FRANCISCO
Signature: /s/ John O. Gunderson, as Attorney-in-Fact
Signature date: 03 Nov 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ASMB transaction

Common Stock

Award

Transaction value
Shares: +38,380
Change %: +23%
Price: $0.000000^*
Shares after: 201,734
Date: 30 Oct 2026
Ownership: Direct
Footnotes: F1

ASMB transaction

Common Stock

Sale

Transaction value: -$120,254
Shares: -6,133
Change %: -3%
Price: $19.61
Shares after: 195,601
Date: 02 Nov 2026
Ownership: Direct
Footnotes: F2, F3

ASMB transaction

Common Stock

Sale

Transaction value: -$1,404
Shares: -69
Change %: -0.04%
Price: $20.35
Shares after: 195,532
Date: 02 Nov 2026
Ownership: Direct
Footnotes: F2, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Represents shares of common stock issuable under a performance-based restricted stock unit award dated June 16, 2025. On October 30, 2026, the performance-based vesting condition was achieved. These shares of common stock vest in two equal installments, assuming continuous service on each vesting date, as follows: October 30, 2026 and October 30, 2027.

Footnote F2

The sales reported on this Form 4 represent shares sold by the reporting person to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units. The sales are mandated by an administrative rule adopted by the Compensation Committee of the Issuer's Board of Directors that requires the satisfaction of tax withholding obligations to be funded by a "sell-to-cover" transaction and do not represent discretionary transactions by the reporting person.

Footnote F3

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.28 to $20.27, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within.

Footnote F4

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.30 to $20.37, inclusive. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within.