Was the ASMB share sale by Jeanette Bjorkquist discretionary?

No, the sale was not discretionary. It was mandated by an administrative rule of the Compensation Committee requiring tax withholding from RSU vesting to be funded through a sell-to-cover transaction rather than an elective open-market sale by the officer.

Assembly Biosciences (ASMB) PFO sells 29 shares to cover RSU taxes

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

ASSEMBLY BIOSCIENCES, INC. principal financial and accounting officer Jeanette M. Bjorkquist reported a small sale of 29 shares of common stock at $23.25 per share. The sale was executed solely to cover tax withholding on vested restricted stock units under a mandatory sell-to-cover rule, and she still holds 14,560 shares directly.

Insider Trade Summary

Net Seller: 29 shares ($674)

Net Sell 1 txn

Insider Bjorkquist Jeanette M

Role PFO and PAO

Sold 29 shs ($674.25)

Type	Security	Shares	Price	Value
Sale	Common Stock	29	$23.25	$674.25

Holdings After Transaction: Common Stock — 14,560 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 29 shares Sale price per share: $23.25 per share Shares held after transaction: 14,560 shares +1 more

4 metrics

Shares sold 29 shares Open-market sale to cover RSU tax withholding

Sale price per share $23.25 per share Tax-related sale of common stock

Shares held after transaction 14,560 shares Direct ownership following tax-related sale

Net buy/sell shares -29 shares Net effect of reported Form 4 transactions

Key Terms

restricted stock units, tax withholding obligations, sell-to-cover, Compensation Committee

4 terms

restricted stock units financial

"in connection with the vesting and settlement of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares sold by the reporting person to cover tax withholding obligations"

sell-to-cover financial

"to be funded by a "sell-to-cover" transaction"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

Compensation Committee financial

"mandated by an administrative rule adopted by the Compensation Committee"

A compensation committee is a group within a company's leadership responsible for setting and reviewing how much top executives and employees are paid, including salaries, bonuses, and benefits. It matters to investors because fair and effective pay decisions can influence a company's performance, leadership motivation, and overall governance, helping ensure that the company’s management is aligned with shareholders’ interests.

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Form 4 Insider Transactions: What Each Field Means →

06/18/2026 - 04:05 PM

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^*

Bjorkquist Jeanette M

(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)
	PFO and PAO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/17/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/17/2026		S⁽¹⁾		29	D	$23.25	14,560	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. The sale reported on this Form 4 represents shares sold by the reporting person to cover tax withholding obligations in connection with the vesting and settlement of restricted stock units. The sale is 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 does not represent a discretionary transaction by the reporting person.

	/s/ John O. Gunderson, as Attorney-in-Fact	06/18/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did ASMB officer Jeanette Bjorkquist report?

She reported selling 29 shares of Assembly Biosciences common stock. The sale occurred at a price of $23.25 per share and was linked to the vesting of restricted stock units, with proceeds used to satisfy related tax withholding obligations.

How many ASMB shares did Jeanette Bjorkquist sell and at what price?

She sold 29 shares of Assembly Biosciences common stock. The reported transaction price was $23.25 per share, and the filing notes that this sale was specifically to cover tax withholding obligations tied to the settlement of restricted stock units.

How many ASMB shares does Jeanette Bjorkquist hold after the transaction?

After the transaction, she directly holds 14,560 shares of Assembly Biosciences common stock. This indicates the tax-related sale covered only a very small portion of her overall direct holdings in the company’s stock.

What role does Jeanette Bjorkquist hold at Assembly Biosciences (ASMB)?

She serves as principal financial officer and principal accounting officer of Assembly Biosciences. This senior finance role makes her transactions reportable, and they are disclosed via Form 4 filings with details on the nature and purpose of each transaction.

Why did the ASMB Form 4 reference restricted stock units and tax withholding?

The Form 4 explains that the sale was to satisfy tax withholding obligations from vesting and settlement of restricted stock units. Company policy requires these taxes be funded by an automatic sell-to-cover transaction instead of separate cash payments by the officer.