Metsera, Inc. — Director's Dealing 2025

May 22, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Metsera, Inc. (MTSR)
CIK: 0002040807
Period of Report: 2025-05-20

Reporting Person: Hubbard Brian (N/A)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-05-20	Stock Option (Right to Buy)	$29.25	A	120000	Acquired	2035-05-19	Common Stock (120000)	Direct

Footnotes

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.