Matthew Lang - Apr 28, 2025 Form 3 Insider Report for Metsera, Inc. (MTSR)

Role: Chief Legal Officer
Signature: /s/ Matthew Lang
Stock symbol: MTSR
Transactions as of: Apr 28, 2025
Transactions value $: $0
Form type: 3
Date filed: 4/30/2025, 09:08 PM
Previous filing: Feb 26, 2025
Next filing: May 22, 2025
SEC: View on sec.gov

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	MTSR	Stock Option (Right to Buy)							Apr 28, 2025	Common Stock	325K	$17.16	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The option was granted on April 15, 2025. The options vest and become exercisable as to 25% of the shares initially subject to the option on the first anniversary of April 14, 2025 and as to 1/48th of the shares initially subject to the option on each monthly anniversary thereafter such that the award is vested in full as of the fourth anniversary of the grant date, in each case, subject to the Reporting Person's continued service through each vesting date.

Content

The option was granted on April 15, 2025. The options vest and become exercisable as to 25% of the shares initially subject to the option on the first anniversary of April 14, 2025 and as to 1/48th of the shares initially subject to the option on each monthly anniversary thereafter such that the award is vested in full as of the fourth anniversary of the grant date, in each case, subject to the Reporting Person's continued service through each vesting date.

Remarks:

The Reporting Person, Matthew Lang, was designated as an officer of Metsera, Inc. pursuant to Rule 16a-1 promulgated under the Securities Exchange Act of 1934, as amended, on April 28, 2025.