Insider plans Rule 144 stock sale filing

A shareholder of ACLX has filed a notice to sell 7,437 shares of common stock through E-TRADE Financial Corporation on or around 01/13/2026 on NASDAQ.

Rhea-AI Filing Summary

A shareholder of ACLX has filed a notice to sell 7,437 shares of common stock through E-TRADE Financial Corporation on or around 01/13/2026 on NASDAQ. The filing shows these shares are part of 57,917,336 common shares outstanding. The seller, Christopher Heery, acquired 16,520 shares as restricted stock units from the issuer on 01/03/2026, with payment noted as N/A. Over the prior three months, he sold 340 shares of common stock on 11/17/2025 for gross proceeds of 30,600.00 and 6,131 shares on 01/12/2026 for gross proceeds of 393,286.14. By signing, the seller represents that he is not aware of any undisclosed material adverse information about ACLX.

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Accepted by SEC EDGAR 01/13/2026 - 09:24 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001789632
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Arcellx, Inc.
SEC File Number	001-41259
Address of Issuer	800 BRIDGE PARKWAY REDWOOD CITY CALIFORNIA 94065
Phone	240-327-0603
Name of Person for Whose Account the Securities are To Be Sold	Heery Christopher
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	E-TRADE FINANCIAL CORPORATION 3 EDISON DRIV ALPHARETTA GA 30005	7437	487213.08	57917336	01/13/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	01/03/2026	Restricted Stock Units	Issuer			16520	01/03/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Christopher Heery 800 Bridge Parkway Redwood City CA 94065	Common Stock	11/17/2025	340	30600.00
Christopher Heery 800 Bridge Parkway Redwood City CA 94065	Common Stock	01/12/2026	6131	393286.14

144: Remarks and Signature

Remarks	SHARES TO BE SOLD TO COVER WITHHOLDING TAXES UPON VESTING OF RESTRICTED STOCK UNIT AWARDS
Date of Notice	01/13/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Michelle Gilson, as Attorney-in-Fact
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)