Matthew Lang - 20 May 2025 Form 4 Insider Report for Metsera, Inc. (MTSR)

Role: Chief Legal Officer
Signature: /s/ Matthew Lang
Issuer symbol: MTSR
Transactions as of: 20 May 2025
Net transactions value: $0
Form type: 4
Filing time: 22 May 2025, 19:37:47 UTC
Previous filing: 30 Apr 2025
Next filing: 13 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lang Matthew	Chief Legal Officer	C/O METSERA, INC., 3 WORLD TRADE CENTER, 175 GREENWICH STREET, NEW YORK	/s/ Matthew Lang	22 May 2025	0001712069

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
transaction	MTSR	Stock Option (Right to Buy)	Award	$0	+46,875		$0.000000	46,875	20 May 2025	Common Stock	46,875	$29.25	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The options will vest and become exercisable in 48 substantially equal monthly installments after the date of grant, such that the option will be vested in full on the fourth anniversary of the date of grant, subject to the Reporting Person's continued service through each such vesting date.