X4 Pharmaceuticals (XFOR) chair sells shares to cover RSU tax obligation

Rhea-AI Filing Summary

X4 Pharmaceuticals, Inc. Executive Chairman Adam R. Craig reported selling 47,436 shares of common stock on August 12, 2026 in an open-market transaction at a weighted average price of $4.4445 per share, with individual trade prices ranging from $4.33 to $4.55. According to the disclosure, the sale was made to cover personal income tax obligations arising from the settlement of a restricted stock unit award. Following this transaction, Craig directly held 328,651 shares of common stock, including 193,254 shares represented by restricted stock units.

Insider Trade Summary

Net Seller: 47,436 shares

Net Sell 1 txn

Insider Craig Adam R

Role Executive Chairman

Sold 47,436 shs ($211K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3	47,436	$4.4445	$211K

Holdings After Transaction: Common Stock — 328,651 shares (Direct)

Footnotes (3)

1. F1. Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $4.33 to $4.55, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
3. F3. Of the shares of common stock reported, 193,254 shares represent restricted stock units.

Key Figures

Shares sold: 47,436 shares Weighted average sale price: $4.4445 per share Sale price range: $4.33 to $4.55 per share +2 more

5 metrics

Shares sold 47,436 shares Common stock sale on August 12, 2026

Weighted average sale price $4.4445 per share Average price for the 47,436 shares sold

Sale price range $4.33 to $4.55 per share Range of prices for individual sale transactions

Shares held after transaction 328,651 shares Direct common stock holdings following the sale

Restricted stock units included 193,254 shares Portion of post-transaction holdings represented by RSUs

Key Terms

restricted stock units, weighted average price, personal income tax obligation, open market or private transaction

4 terms

restricted stock units financial

"Of the shares of common stock reported, 193,254 shares represent restricted stock units."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

personal income tax obligation financial

"Sale of shares to cover personal income tax obligation upon settlement"

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

What insider transaction did X4 Pharmaceuticals (XFOR) report?

X4 Pharmaceuticals reported that Executive Chairman Adam R. Craig sold 47,436 shares of common stock on August 12, 2026. The sale was executed in open-market transactions and was used to cover personal income tax obligations from a restricted stock unit settlement.

At what price were the XFOR shares sold by the Executive Chairman?

The Executive Chairman’s 47,436 shares were sold at a weighted average price of $4.4445 per share. The filing notes multiple trades within a price range of $4.33 to $4.55 per share for these transactions.

Why did Adam R. Craig sell X4 Pharmaceuticals (XFOR) shares?

The filing states that Adam R. Craig sold the shares to cover personal income tax obligations arising from the settlement of a restricted stock unit award. This characterizes the sale as tax-related rather than a discretionary portfolio transaction.

How many X4 Pharmaceuticals (XFOR) shares does the insider hold after the sale?

After the reported sale, Adam R. Craig directly held 328,651 shares of X4 Pharmaceuticals common stock. Of this total, 193,254 shares are represented by restricted stock units as disclosed in the footnotes.

Were the XFOR insider share sales made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming use of such a plan. The footnotes attribute the transaction to covering taxes on restricted stock unit settlement, without describing it as occurring under a pre-arranged trading plan.

What does the price range disclosure mean for the XFOR insider sale?

The filing explains the reported $4.4445 is a weighted average price for multiple trades. Individual sale prices for the 47,436 shares ranged between $4.33 and $4.55, and detailed per-trade data is available on request.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/13/2026 - 04:11 PM Accepted by SEC EDGAR 08/13/2026 - 04:10 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Craig Adam R

(Last) (First) (Middle)

C/O X4 PHARMACEUTICALS INC.

61 NORTH BEACON STREET, 4TH FLOOR

(Street)

BOSTON MASSACHUSETTS 02134

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
X4 Pharmaceuticals, Inc [ XFOR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chairman

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/12/2026		S(1)		47,436	D	$4.4445(2)	328,651(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Sale of shares to cover personal income tax obligation upon settlement of restricted stock unit award.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $4.33 to $4.55, inclusive. The Reporting Person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. Of the shares of common stock reported, 193,254 shares represent restricted stock units.

Remarks:

	/s/ David Kirske, Attorney-In-Fact	08/13/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)