Andrew David Levin - Jun 4, 2025 Form 4 Insider Report for Climb Bio, Inc. (CLYM)

Role: Director
Signature: Emily Pimblett, as Attorney-in-Fact
Stock symbol: CLYM
Transactions as of: Jun 4, 2025
Transactions value $: $0
Form type: 4
Date filed: 6/5/2025, 04:10 PM
Previous filing: Jun 28, 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Levin Andrew David	Director	C/O CLIMB BIO, INC., 20 WILLIAM STREET, SUITE 145, WELLESLEY HILLS	Emily Pimblett, as Attorney-in-Fact	2025-06-05	0001867539

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	CLYM	Stock Option (Right to Buy)	Award	$0	+40K		$0.00	40K	Jun 4, 2025	Common Stock	40K	$1.29	Direct	F1, F2

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

Explanation of Responses:

Id	Content
F1	The shares subject to the option will vest on the earlier of June 4, 2026 or the date immediately prior to the date of the next annual meeting of stockholders, subject to the reporting person's continued service through such date.
F2	Under the reporting person's arrangement with RA Capital Management, L.P. (the "Adviser"), the reporting person holds the stock option for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund, L.P. (the "Nexus Fund"), RA Capital Nexus Fund II, L.P. (the "Nexus Fund II"), RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"), and a separately managed account (the "Account"). The reporting person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the stock option, which will offset advisory fees owed by the Fund, the Nexus Fund, the Nexus Fund II, the Nexus Fund III, and the Account to the Adviser. The reporting person therefore disclaims beneficial ownership of the stock option and underlying common stock.

Content

The shares subject to the option will vest on the earlier of June 4, 2026 or the date immediately prior to the date of the next annual meeting of stockholders, subject to the reporting person's continued service through such date.

Under the reporting person's arrangement with RA Capital Management, L.P. (the "Adviser"), the reporting person holds the stock option for the benefit of the RA Capital Healthcare Fund, L.P. (the "Fund"), RA Capital Nexus Fund, L.P. (the "Nexus Fund"), RA Capital Nexus Fund II, L.P. (the "Nexus Fund II"), RA Capital Nexus Fund III, L.P. (the "Nexus Fund III"), and a separately managed account (the "Account"). The reporting person is obligated to turn over to the Adviser any net cash or stock received upon exercise of the stock option, which will offset advisory fees owed by the Fund, the Nexus Fund, the Nexus Fund II, the Nexus Fund III, and the Account to the Adviser. The reporting person therefore disclaims beneficial ownership of the stock option and underlying common stock.

Remarks:

Exhibit Index: 24.1 - Power of Attorney