MBX

SEC source: 0000950170-24-107525 · ownership.xml · nonDerivative · entry 1

Aynechi Tiba · CIK 0001669220 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Norwest Venture Partners XVI, LP

Disclosed balance after: 1,386,335

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each share of Series B Convertible Preferred Stock (the "Preferred Stock") was convertible into Common Stock on a one-for-12.0221 basis at any time at the option of the holder, and automatically converted into the number of shares shown in Column 7 immediately prior to the closing of the Issuer's initial public offering on September 16, 2024. The Preferred Stock had no expiration date.

F2 · ownership.nature: The securities are directly held by Norwest Venture Partners XVI, LP ("NVP XVI"). Genesis VC Partners XVI, LLC ("Genesis XVI") is the general partner of NVP XVI and NVP Associates, LLC ("NVP Associates") is the managing member of Genesis XVI. The Reporting Person, as an officer of NVP Associates and director of the Issuer, may be deemed to share voting and dispositive power over the shares held by NVP XVI and disclaims beneficial ownership of such securities except to the extent of her pecuniary interest therein.

SEC source: 0000950170-24-106441 · ownership.xml · derivative · entry 1

Hawryluk P. Kent · CIK 0001673991 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,436

Underlying: Common Stock · 120,436 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106457 · ownership.xml · derivative · entry 1

Azoulay Salomon · CIK 0002030246 · Chief Medical Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,011

Underlying: Common Stock · 45,011 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106476 · ownership.xml · derivative · entry 1

Ryder Steven · CIK 0001872868 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106478 · ownership.xml · derivative · entry 1

GORDON CARL L · CIK 0001282930 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

F2 · ownership.direct: Pursuant to an agreement with OrbiMed Advisors LLC and OrbiMed Capital GP VII LLC, the Reporting Person is obligated to transfer any securities issued under any such stock options or other awards, or the economic benefit thereof, to OrbiMed Advisors LLC and OrbiMed Capital GP VII LLC, which will in turn ensure that such securities or economic benefits are provided to OrbiMed Private Investments VII, LP.

SEC source: 0000950170-24-106467 · ownership.xml · derivative · entry 1

Bartram Richard · CIK 0001723729 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,578

Underlying: Common Stock · 42,578 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106456 · ownership.xml · derivative · entry 1

Mathers Edward T · CIK 0001328625 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106440 · ownership.xml · derivative · entry 1

Aynechi Tiba · CIK 0001669220 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106439 · ownership.xml · derivative · entry 1

Heron Patrick J · CIK 0001365617 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106436 · ownership.xml · derivative · entry 1

CORNELIUS JAMES M · CIK 0001198959 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.

SEC source: 0000950170-24-106431 · ownership.xml · derivative · entry 1

Pescovitz Ora H. · CIK 0001519624 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,963

Underlying: Common Stock · 15,963 shares

Expires 2034-09-11

F1 · derivative.exercise_date: 25% of the shares underlying this option vest and become exercisable on September 12, 2025, with the remaining 75% vesting in thirty-six (36) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.