Assembly Biosciences officer acquires 13,705 shares

The award’s performance condition was achieved, with vesting in two equal installments subject to continuous service on the stated dates.

Available on EDGAR 11/03/2026 - 04:40 PM EST Accepted by SEC EDGAR 11/03/2026 - 04:40 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Assembly Biosciences, Inc. (ASMB) Chief Scientific Officer William E. Delaney IV reported an award acquisition involving 13,705 shares of common stock on October 30, 2026. The shares are issuable under a performance-based restricted stock unit award dated June 16, 2025; a performance-based vesting condition was achieved. The shares vest in two equal installments, assuming continuous service on October 30, 2026 and October 30, 2027. Delaney’s reported direct common-stock holdings following the transaction were 74,035 shares.

Insider Trade Summary

Grant/Award: 13,705 shares

Grant/Award 1 txn

Insider Delaney William E IV

Role Chief Scientific Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	13,705	$0.00	$0.00

Holdings After Transaction: Common Stock — 74,035 shares (Direct)

Footnotes (1)

1. F1. Represents shares of common stock issuable under a performance-based restricted stock unit award dated June 16, 2025. On October 30, 2026, a 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.

Key Figures

Award shares: 13,705 shares Direct common-stock holdings: 74,035 shares Award date: June 16, 2025 +2 more

5 metrics

Award shares 13,705 shares Award acquisition reported October 30, 2026

Direct common-stock holdings 74,035 shares Following the reported transaction

Award date June 16, 2025 Performance-based restricted stock unit award

First vesting date October 30, 2026 One of two equal installments, assuming continuous service

Second vesting date October 30, 2027 One of two equal installments, assuming continuous service

Key Terms

performance-based restricted stock unit award, performance-based vesting condition, continuous service

3 terms

performance-based restricted stock unit award financial

"shares of common stock issuable under a performance-based restricted stock unit award"

A performance-based restricted stock unit award is a promise to give company shares to an employee or executive only if the business hits specific targets over a set period. Think of it as a conditional prize that vests like a savings plan: if agreed goals (such as revenue, profit, or stock performance) are met, the recipient receives the shares; if not, they get nothing. Investors pay attention because these awards align management incentives with company results and can affect share count, future earnings and executive behavior.

performance-based vesting condition financial

"a performance-based vesting condition was achieved"

continuous service financial

"assuming continuous service on each vesting date"

FAQ

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How many shares did ASMB Chief Scientific Officer William E. Delaney IV acquire?

William E. Delaney IV reported an award acquisition involving 13,705 shares of common stock on October 30, 2026. The shares are issuable under a performance-based restricted stock unit award, and his reported direct common-stock holdings following the transaction were 74,035 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Delaney William E IV

(Last) (First) (Middle)

C/O ASSEMBLY BIOSCIENCES, INC.

TWO TOWER PLACE, 7TH FLOOR

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ASSEMBLY BIOSCIENCES, INC. [ ASMB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Scientific Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/30/2026		A		13,705(1)	A	$0	74,035	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares of common stock issuable under a performance-based restricted stock unit award dated June 16, 2025. On October 30, 2026, a 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.

	/s/ John O. Gunderson, as Attorney-in-Fact	11/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)