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Monte Rosa Therapeutics (NASDAQ: GLUE) officer reports stock and option holdings in Form 3

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Monte Rosa Therapeutics, Inc. executive Matthew Bowen, Principal Accounting Officer, filed an initial ownership report showing direct holdings of common stock and multiple stock option awards. He reports 21,604 shares of common stock held directly, which includes 3,590 unvested restricted stock units that convert into shares as they vest.

Bowen also holds several stock options to buy common stock at exercise prices ranging from $5.71 to $23.99 per share, with expiration dates between 2031 and 2036. These options vest over time, often with 25% vesting on a stated date and the balance in 36 monthly installments, contingent on continued service.

Positive

  • None.

Negative

  • None.
Insider Bowen Matthew
Role Principal Accounting Officer
Type Security Shares Price Value
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Stock Option (Right to Buy) — 5,500 shares (Direct); Common Stock — 21,604 shares (Direct)
Footnotes (1)
  1. The amount reported in Column 2 includes 3,590 unvested restricted stock units ("RSUs") granted under the Issuer's 2021 Stock Option and Incentive Plan. Each RSU represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement. This option is fully vested and exercisable. 25% of this option vested and became exercisable on January 3, 2024, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date. 25% of this option vested and became exercisable on January 1, 2025, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date. 25% of this option vested and became exercisable on March 1, 2025, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date. 25% of this option vested and became exercisable on January 2, 2026, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date. 25% of this option shall vest and become exercisable on October 1, 2026, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date. 25% of this option shall vest and become exercisable on January 2, 2027, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
Direct common stock holdings 21,604 shares Common Stock held directly as of Form 3
Unvested RSUs included 3,590 RSUs Restricted stock units under 2021 Stock Option and Incentive Plan
Option exercise price $23.99 per share Stock option exercisable for 5,500 underlying shares, expiring 2031-10-31
Option exercise price $13.41 per share Stock option exercisable for 9,950 underlying shares, expiring 2032-02-29
Lowest option exercise price $5.71 per share Stock option exercisable for 3,698 underlying shares, expiring 2034-01-01
Largest option block 10,800 underlying shares Stock option at $7.11 exercise price, expiring 2035-01-01
restricted stock units ("RSUs") financial
"includes 3,590 unvested restricted stock units ("RSUs") granted under the Issuer's 2021 Stock Option and Incentive Plan"
Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.
Stock Option (Right to Buy) financial
"security_title": "Stock Option (Right to Buy)""
exercise price financial
"conversion_or_exercise_price": "7.1100""
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.
vesting financial
"with the remainder vesting in 36 substantially equal monthly installments thereafter"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
Form 3 regulatory
"INSIDER FILING DATA (Form 3)"
Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Bowen Matthew

(Last)(First)(Middle)
MONTE ROSA THERAPEUTICS, INC.
321 HARRISON AVENUE, SUITE 900

(Street)
BOSTON MASSACHUSETTS 02118

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
04/03/2026
3. Issuer Name and Ticker or Trading Symbol
Monte Rosa Therapeutics, Inc. [ GLUE ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Principal Accounting Officer
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock21,604(1)D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy) (2)10/31/2031Common Stock5,500$23.99D
Stock Option (Right to Buy) (2)02/29/2032Common Stock9,950$13.41D
Stock Option (Right to Buy) (3)01/02/2033Common Stock3,551$7.78D
Stock Option (Right to Buy) (4)01/01/2034Common Stock3,698$5.71D
Stock Option (Right to Buy) (5)02/28/2034Common Stock1,501$6.3D
Stock Option (Right to Buy) (6)01/01/2035Common Stock10,800$7.11D
Stock Option (Right to Buy) (7)09/30/2035Common Stock625$7.5D
Stock Option (Right to Buy) (8)01/01/2036Common Stock7,400$15.31D
Explanation of Responses:
1. The amount reported in Column 2 includes 3,590 unvested restricted stock units ("RSUs") granted under the Issuer's 2021 Stock Option and Incentive Plan. Each RSU represents the contingent right to receive one share of the Issuer's Common Stock upon vesting and settlement.
2. This option is fully vested and exercisable.
3. 25% of this option vested and became exercisable on January 3, 2024, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
4. 25% of this option vested and became exercisable on January 1, 2025, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
5. 25% of this option vested and became exercisable on March 1, 2025, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
6. 25% of this option vested and became exercisable on January 2, 2026, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
7. 25% of this option shall vest and become exercisable on October 1, 2026, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
8. 25% of this option shall vest and become exercisable on January 2, 2027, with the remainder vesting in 36 substantially equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.
Remarks:
Exhibit 24 - Power of Attorney
/s/ Phil Nickson, Attorney-in-Fact04/07/2026
** Signature of Reporting PersonDate
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 5 (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 3: SEC 1473 (03-26)

FAQ

What does Matthew Bowen’s Form 3 filing for Monte Rosa Therapeutics (GLUE) show?

The Form 3 shows Matthew Bowen’s initial ownership in Monte Rosa Therapeutics, including 21,604 common shares and several stock option grants. It also notes 3,590 unvested RSUs that can convert into common stock as vesting conditions tied to continued service are met.

How many Monte Rosa Therapeutics (GLUE) common shares does Matthew Bowen report owning?

Matthew Bowen reports direct ownership of 21,604 Monte Rosa Therapeutics common shares. This figure includes 3,590 unvested restricted stock units, each representing a right to receive one share of common stock upon vesting and settlement under the company’s 2021 Stock Option and Incentive Plan.

What stock options does Matthew Bowen hold in Monte Rosa Therapeutics (GLUE)?

Bowen holds several stock options to purchase Monte Rosa common stock with exercise prices from $5.71 to $23.99 per share. These options cover different underlying share amounts and have expiration dates from 2031 through 2036, providing potential future share acquisition if exercised.

How do Matthew Bowen’s RSUs in Monte Rosa Therapeutics (GLUE) work?

Bowen’s 3,590 RSUs each represent a contingent right to receive one Monte Rosa common share. They were granted under the 2021 Stock Option and Incentive Plan and convert into shares only as vesting and settlement occur, subject to his continued service with the company on specified vesting dates.

What are the vesting terms of Matthew Bowen’s Monte Rosa Therapeutics (GLUE) options?

Several Bowen option grants vest 25% on a specific initial date, with the remaining 75% vesting in 36 substantially equal monthly installments. Vesting is conditioned on his continued service with Monte Rosa Therapeutics on each vesting date, aligning long-term incentives with ongoing employment.

Does Matthew Bowen currently exercise any Monte Rosa Therapeutics (GLUE) options in this Form 3?

The Form 3 lists Bowen’s existing option and stock holdings but does not show option exercises or share sales. It focuses on his post-grant holdings, including vested and unvested options and RSUs, as of the reporting date, providing a baseline of his equity position with the company.