Monte Rosa director granted 25,800 stock options

Monte Rosa Therapeutics director Christine Siu received a grant of stock options covering 25,800 shares of common stock.

Rhea-AI Filing Summary

Monte Rosa Therapeutics director Christine Siu received a grant of stock options covering 25,800 shares of common stock. The options have an exercise price of $17.10 per share and expire on June 11, 2036. They vest in full on the earlier of June 11, 2027 or the company’s next annual meeting of stockholders, subject to her continued service.

Insider Trade Summary

Grant/Award: 25,800 shares

Grant/Award 1 txn

Insider Siu Christine

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	25,800	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 25,800 contracts (Direct)

Footnotes (1)

1. F1. The shares subject to this option shall vest and become exercisable in full upon the earlier to occur of (i) June 11, 2027 or (ii) the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service at such time.

Key Figures

Options granted: 25,800 shares Exercise price: $17.10 per share Expiration date: June 11, 2036 +3 more

6 metrics

Options granted 25,800 shares Stock option grant to director Christine Siu

Exercise price $17.10 per share Strike price for granted options

Expiration date June 11, 2036 Option term end date

Shares underlying options 25,800 shares Common stock underlying the derivative security

Vesting trigger date June 11, 2027 Earlier of this date or next annual meeting, subject to service

Total options held after grant 25,800 options Total derivative shares following this transaction

Key Terms

Stock Option (Right to Buy), exercise price, vest and become exercisable, annual meeting of stockholders, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: Stock Option (Right to Buy)"

exercise price financial

"conversion_or_exercise_price: 17.1000"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vest and become exercisable financial

"The shares subject to this option shall vest and become exercisable in full"

annual meeting of stockholders financial

"the Issuer's next annual meeting of stockholders"

continued service financial

"subject to the Reporting Person's continued service at such time"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Monte Rosa Therapeutics (GLUE) report in this Form 4?

Monte Rosa Therapeutics reported that director Christine Siu received a grant of stock options for 25,800 shares of common stock. These options are part of her compensation and give her the right to buy shares at a fixed exercise price in the future.

How many stock options did Christine Siu receive from Monte Rosa Therapeutics (GLUE)?

Christine Siu received 25,800 stock options linked to Monte Rosa Therapeutics common stock. Each option represents the right to purchase one share, giving her potential future equity exposure if the company’s share price exceeds the fixed exercise price.

What is the exercise price of Christine Siu’s Monte Rosa Therapeutics (GLUE) options?

The stock options granted to Christine Siu have an exercise price of $17.10 per share. This means she can buy Monte Rosa Therapeutics common stock at $17.10 if she exercises the options after they vest and before they expire.

When do Christine Siu’s Monte Rosa Therapeutics (GLUE) options vest?

These options vest and become exercisable in full on the earlier of June 11, 2027 or Monte Rosa Therapeutics’ next annual meeting of stockholders. Vesting also requires Christine Siu’s continued service with the company through that vesting date.

When do Christine Siu’s Monte Rosa Therapeutics (GLUE) options expire?

The granted stock options expire on June 11, 2036. After this expiration date, any unexercised options become worthless, so she must exercise vested options before that date if she wishes to purchase shares at the fixed exercise price.

Is this Monte Rosa Therapeutics (GLUE) Form 4 a stock purchase or sale?

This Form 4 reflects a grant of stock options, not an open-market stock purchase or sale. It is a compensation-related award giving Christine Siu the right to buy shares later, rather than a current transaction in the company’s stock.

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

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Accepted by SEC EDGAR 06/12/2026 - 04:05 PM EDT Learn about SEC filing dates

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^*

Siu Christine

(Last) (First) (Middle)

MONTE ROSA THERAPEUTICS, INC.

321 HARRISON AVENUE, SUITE 900

(Street)

BOSTON MASSACHUSETTS 02118

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Monte Rosa Therapeutics, Inc. [ GLUE ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/11/2026

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

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
Stock Option (Right to Buy)	$17.1	06/11/2026		A		25,800		(1)	06/11/2036	Common Stock	25,800	$0	25,800	D

Explanation of Responses:

1. The shares subject to this option shall vest and become exercisable in full upon the earlier to occur of (i) June 11, 2027 or (ii) the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service at such time.

	/s/ Markus Warmuth, Attorney-in-Fact	06/12/2026
	** 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)