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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

X0202 SCHEDULE 13D/A 0001072613-22-000291 0001629794 XXXXXXXX LIVE 6 Common Stock $0.001 par value per share 04/28/2026 false 0001786205 03940C100 Arcellx, Inc. 800 Bridge Parkway Redwood City CA 94065 Stephanie Brecher (410)842-4000 New Enterprise Associates 1954 Greenspring Drive, Suite 600 Timonium MD 21093 0001629794 N New Enterprise Associates 15, L.P. WC N DE 0.00 0.00 0.00 0.00 0.00 N 0 PN 0001640031 N NEA Partners 15, L.P. AF N DE 0.00 0.00 0.00 0.00 0.00 N 0 PN 0001640033 N NEA 15 GP, LLC AF N DE 0.00 0.00 0.00 0.00 0.00 N 0 OO 0001277631 N Forest Baskett AF N X1 0.00 0.00 0.00 0.00 0.00 N 0 IN 0001559827 N Anthony A. Florence, Jr. AF N X1 0.00 0.00 0.00 0.00 0.00 N 0 IN 0001630226 N Mohamad H. Makhzoumi AF N X1 0.00 0.00 0.00 0.00 0.00 N 0 IN 0001237289 N Scott D. Sandell AF N X1 0.00 0.00 0.00 0.00 0.00 N 0 IN Common Stock $0.001 par value per share Arcellx, Inc. 800 Bridge Parkway Redwood City CA 94065 This Amendment No. 6 ("Amendment No. 6") to Schedule 13D amends and supplements the Schedule 13D originally filed on February 17, 2022 (the "Schedule 13D"), Amendment No. 1 thereto filed on January 24, 2023 ("Amendment No. 1"), Amendment No. 2 thereto filed on June 23, 2023 ("Amendment No. 2"), Amendment No. 3 thereto filed on May 12, 2025 ("Amendment No. 3"), Amendment No. 4 thereto filed on August 14, 2025 ("Amendment No. 4") and Amendment No. 5 thereto filed on February 24, 2026 ("Amendment No. 5"), relating to the Common Stock of the Issuer. Certain terms used but not defined in this Amendment No. 6 have the meanings assigned thereto in the Schedule 13D (and Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4 and Amendment No. 5 thereto). Except as specifically provided herein, this Amendment No. 6 does not modify any of the information previously reported on the Schedule 13D (and Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4 and Amendment No. 5 thereto). New Enterprise Associates 15, L.P. ("NEA 15"), NEA Partners 15, L.P. ("NEA Partners 15"), which is the sole general partner of NEA 15; and NEA 15 GP, LLC ("NEA 15 LLC" and, together with NEA Partners 15, the "Control Entities"), which is the sole general partner of NEA Partners 15; and Forest Baskett ("Baskett"), Anthony A. Florence, Jr. ("Florence"), Mohamad H. Makhzoumi ("Makhzoumi") and Scott D. Sandell ("Sandell") (together, the "Managers"). The Managers are the managers of NEA 15 LLC. The persons named in this Item 2 are referred to individually herein as a "Reporting Person" and collectively as the "Reporting Persons." The address of the principal business office of NEA 15, each Control Entity and Sandell is New Enterprise Associates, 1954 Greenspring Drive, Suite 600, Timonium, MD 21093. The address of the principal business office of Baskett and Makhzoumi is New Enterprise Associates, 2855 Sand Hill Road, Menlo Park, CA 94025. The address of the principal business office of Florence is New Enterprise Associates, 104 5th Avenue, 19th Floor, New York, NY 10011. The principal business of NEA 15 is to invest in and assist growth-oriented businesses located principally in the United States. The principal business of NEA Partners 15 is to act as the sole general partner of NEA 15. The principal business of NEA 15 LLC is to act as the sole general partner of NEA Partners 15. The principal business of each of the Managers is to manage the Control Entities and a number of affiliated partnerships with similar businesses. During the five years prior to the date hereof, none of the Reporting Persons has been convicted in a criminal proceeding or has been a party to a civil proceeding ending in a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. During the five years prior to the date hereof, none of the Reporting Persons has been convicted in a criminal proceeding or has been a party to a civil proceeding ending in a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. NEA 15 LLC is a limited liability company organized under the laws of the State of Delaware. NEA 15 and NEA Partners 15 are limited partnerships organized under the laws of the State of Delaware. Each of the Managers is a United States citizen. Not applicable. As previously disclosed by the Issuer on February 23, 2026, the Issuer entered into an Agreement and Plan of Merger, dated as of February 22, 2026 (the "Merger Agreement"), with Gilead Sciences, Inc., a Delaware corporation ("Parent") and Ravens Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent ("Purchaser"). Pursuant to the Merger Agreement, and upon the terms and subject to the conditions thereof, on April 28, 2026, Purchaser completed a tender offer (the "Offer") to purchase all of the issued and outstanding shares of Common Stock of the Issuer in exchange for (i) $115.00 per share of Common Stock, net to the seller in cash, without interest and subject to any applicable withholding tax, and (ii) one contractual contingent value right (each, a "CVR"), which represents the right to receive one contingent payment of $5.00 per CVR, in cash, without interest and subject to any applicable withholding tax, upon the achievement of a specified milestone in accordance with the terms and subject to the conditions of a contingent value rights agreement. Pursuant to the Support Agreements, NEA 15 tendered all of its shares of Common Stock in the Offer, which shares were accepted for payment by Purchaser. Following the consummation of the Offer, on April 28, 2026, Purchaser merged with and into the Issuer, with the Issuer surviving the merger as a wholly owned subsidiary of Parent. The foregoing descriptions of the Merger Agreement and the Support Agreements are qualified in their entirety by reference to the full text of such agreements. The Merger Agreement and the form of Support Agreement are included as Exhibit 2.1 and Exhibit 10.1, respectively, of Issuer's Form 8-K, filed with the Securities and Exchange Commission on February 23, 2026 and are incorporated herein by reference. The Reporting Persons do not beneficially own any shares of Common Stock. Regarding the number of shares as to which such person has: (i) sole power to vote or to direct the vote: See line 7 of cover sheets (ii) shared power to vote or to direct the vote: See line 8 of cover sheets (iii) sole power to dispose or to direct the disposition: See line 9 of cover sheets (iv) shared power to dispose or to direct the disposition: See line 10 of cover sheets. Except as set forth in Item 4 above, none of the Reporting Persons has effected any transaction in the NEA 15 Shares during the last 60 days. No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, Common Stock beneficially owned by any of the Reporting Persons. Each of the Reporting Persons has ceased to own beneficially five percent (5%) or more of the Issuer's Common Stock as of April 28, 2026. The information provided and incorporated by reference in Item 4 is hereby incorporated by reference to the extent responsive to this Item 6. Exhibit 1 - Agreement regarding filing of joint Schedule 13D. Exhibit 2 - Power of Attorney regarding filings under the Securities Exchange Act of 1934, as amended. New Enterprise Associates 15, L.P. /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer 04/30/2026 /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Mohamad H. Makhzoumi, Managing Partner and Co-Chief Executive Officer 04/30/2026 NEA Partners 15, L.P. /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer 04/30/2026 /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Mohamad H. Makhzoumi, Managing Partner and Co-Chief Executive Officer 04/30/2026 NEA 15 GP, LLC /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer 04/30/2026 /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Mohamad H. Makhzoumi, Managing Partner and Co-Chief Executive Officer 04/30/2026 Forest Baskett /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Forest Baskett 04/30/2026 Anthony A. Florence, Jr. /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Anthony A. Florence Jr. 04/30/2026 Mohamad H. Makhzoumi /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Mohamad H. Makhzoumi 04/30/2026 Scott D. Sandell /s/ Nicole Hatcher Nicole Hatcher as attorney-in-fact for Scott D. Sandell 04/30/2026 This Amendment No. 6 to Schedule 13D was executed by Nicole Hatcher on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which is attached as Exhibit 2.