Adam R. Craig - Oct 29, 2025 Form 4 Insider Report for X4 Pharmaceuticals, Inc (XFOR)

Role: Executive Chairman, Director
Signature: /s/ David Kirske, Attorney-In-Fact
Stock symbol: XFOR
Transactions as of: Oct 29, 2025
Transactions value $: $0
Form type: 4
Date filed: 10/31/2025, 04:42 PM
Previous filing: Oct 27, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Craig Adam R	Executive Chairman, Director	C/O X4 PHARMACEUTICALS INC., 61 NORTH BEACON STREET, 4TH FLOOR, BOSTON	/s/ David Kirske, Attorney-In-Fact	2025-10-31	0001339498

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	XFOR	Stock Option (right to buy)	Award	$0	+2.33M		$0.00	2.33M	Oct 29, 2025	Common Stock	2.33M	$1.42	Direct	F1

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

Explanation of Responses:

Id	Content
F1	Represents stock options granted to the Reporting Person on August 12, 2025, which were subject to a performance-based vesting condition that was satisfied on October 29, 2025. One third of the shares subject to the option shall vest on August 12, 2026, with the remainder vesting in equal installments each successive month thereafter for a period of 24 months, subject to the Reporting Person continuing to provide services through each such date.

Content

Represents stock options granted to the Reporting Person on August 12, 2025, which were subject to a performance-based vesting condition that was satisfied on October 29, 2025. One third of the shares subject to the option shall vest on August 12, 2026, with the remainder vesting in equal installments each successive month thereafter for a period of 24 months, subject to the Reporting Person continuing to provide services through each such date.