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    Amendment: SEC Form SCHEDULE 13G/A filed by HCM II Acquisition Corp.

    8/8/25 9:01:49 AM ET
    $HOND
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    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549


    SCHEDULE 13G


    UNDER THE SECURITIES EXCHANGE ACT OF 1934
    (Amendment No. 1)


    HCM II Acquisition Corp.

    (Name of Issuer)


    Class A ordinary shares, par value $0.0001

    (Title of Class of Securities)


    G43658106

    (CUSIP Number)


    06/30/2025

    (Date of Event Which Requires Filing of this Statement)


    Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
    Checkbox checked   Rule 13d-1(b)
    Checkbox not checked   Rule 13d-1(c)
    Checkbox not checked   Rule 13d-1(d)






    SCHEDULE 13G

    CUSIP No.
    G43658106


    1Names of Reporting Persons

    MAGNETAR FINANCIAL LLC
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox not checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    DELAWARE
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    1,397,166.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    1,397,166.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    1,397,166.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    6.07 %
    12Type of Reporting Person (See Instructions)

    IA, OO


    SCHEDULE 13G

    CUSIP No.
    G43658106


    1Names of Reporting Persons

    MAGNETAR CAPITAL PARTNERS LP
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox not checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    DELAWARE
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    1,397,166.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    1,397,166.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    1,397,166.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    6.07 %
    12Type of Reporting Person (See Instructions)

    HC, PN


    SCHEDULE 13G

    CUSIP No.
    G43658106


    1Names of Reporting Persons

    SUPERNOVA MANAGEMENT LLC
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox not checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    DELAWARE
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    1,397,166.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    1,397,166.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    1,397,166.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    6.07 %
    12Type of Reporting Person (See Instructions)

    HC, OO


    SCHEDULE 13G

    CUSIP No.
    G43658106


    1Names of Reporting Persons

    DAVID J. SNYDERMAN
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox not checked  (b)
    3Sec Use Only
    4Citizenship or Place of Organization

    UNITED STATES
    Number of Shares Beneficially Owned by Each Reporting Person With:
    5Sole Voting Power

    0.00
    6Shared Voting Power

    1,397,166.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    1,397,166.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    1,397,166.00
    10Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

    Checkbox not checked
    11Percent of class represented by amount in row (9)

    6.07 %
    12Type of Reporting Person (See Instructions)

    HC, IN


    SCHEDULE 13G

    Item 1. 
    (a)Name of issuer:

    HCM II Acquisition Corp.
    (b)Address of issuer's principal executive offices:

    100 First Stamford Place Stamford, CT, 06902
    Item 2. 
    (a)Name of person filing:

    This statement is filed on behalf of each of the following person (collectively, the "Reporting Persons"): i) Magnetar Financial LLC ("Magnetar Financial"); ii) Magnetar Capital Partners LP (Magnetar Capital Partners"); iii) Supernova Management LLC ("Supernova Management"); and iv) David J. Snyderman ("Mr. Snyderman"). This statement relates to the Shares (as defined herein) held for Magnetar Constellation Master Fund, Ltd ("Constellation Master Fund"), Magnetar Xing He Master Fund Ltd ("Xing He Master Fund"), Magnetar SC Fund Ltd ("SC Fund"), Purpose Alternative Credit Fund Ltd ("Purpose Credit Fund"), all Cayman Islands exempted companies; Magnetar Structured Credit Fund, LP ("Structured Credit Fund") a Delaware limited partnership; Magnetar Alpha Star Fund LLC ("Alpha Star Fund"), Magnetar Lake Credit Fund LLC ("Lake Credit Fund"), Purpose Alternative Credit Fund - T LLC ("Purpose Credit Fund - T"), all Delaware limited liability companies; collectively (the "Magnetar Funds"). Magnetar Financial serves as the investment adviser to the Magnetar Funds, and as such, Magnetar Financial exercises voting and investment power over the Shares held for the Magnetar Funds' accounts. Magnetar Capital Partners serves as the sole member and parent holding company of Magnetar Financial. Supernova Management is the general partner of Magnetar Capital Partners. The manager of Supernova Management is Mr. Snyderman.
    (b)Address or principal business office or, if none, residence:

    The address of the principal business office of each of Magnetar Financial, Magnetar Capital Partners, Supernova Management, and Mr. Snyderman is 1603 Orrington Avenue, 13th Floor, Evanston, Illinois 60201.
    (c)Citizenship:

    Place of Organization. i) Magnetar Financial is a Delaware limited liability company; ii) Magnetar Capital Partners is a Delaware limited partnership; iii) Supernova Management is a Delaware limited liability company; and iv) Mr. Snyderman is a citizen of the United States of America.
    (d)Title of class of securities:

    Class A ordinary shares, par value $0.0001
    (e)CUSIP No.:

    G43658106
    Item 3.If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
    (a)Checkbox not checked   Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
    (b)Checkbox not checked   Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
    (c)Checkbox not checked   Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
    (d)Checkbox not checked   Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
    (e)Checkbox checked   An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
    (f)Checkbox not checked   An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
    (g)Checkbox checked   A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
    (h)Checkbox not checked   A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
    (i)Checkbox not checked   A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
    (j)Checkbox not checked   A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
           please specify the type of institution:
    (k)Checkbox not checked   Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
     
    Item 4.Ownership
    (a)Amount beneficially owned:

    As of June 30, 2025, each of Magnetar Financial, Magnetar Capital Partners, Supernova Management and Mr. Snyderman held 1,397,166 Shares. The amount consists of (A) 324,605 Shares held for the account of Constellation Master Fund; (B) 239,923 Shares held for the account of Lake Credit Fund; (C) 225,804 Shares held for the account of Structured Credit Fund; (D) 211,688 Shares held for the account of Xing He Master Fund; (E) 141,128 Shares held for the account of Alpha Star Fund; (F) 127,001 Shares held for the account of Purpose Credit Fund; (G) 98,787 Shares held for the account SC Fund; and (H) 28,224 Shares held for the account of Purpose Credit Fund -T. The Shares held by the Magnetar Funds represent approximately 6.07% of the total number of Shares outstanding (calculated pursuant to Rule 13d-3(d)(1)(i)) of the outstanding shares of the Issuer).
    (b)Percent of class:

    As of June 30, 2025, each of the Reporting Persons were deemed to be the beneficial owner constituting approximately 6.07% of the total number of shares outstanding (based upon the information provided by the Issuer in its Form 10-Q filed with the SEC on May 20, 2025, there were approximately 23,000,000 Shares outstanding).
    (c)Number of shares as to which the person has:
     (i) Sole power to vote or to direct the vote:

    0

     (ii) Shared power to vote or to direct the vote:

    1,397,166

     (iii) Sole power to dispose or to direct the disposition of:

    0

     (iv) Shared power to dispose or to direct the disposition of:

    1,397,166

    Item 5.Ownership of 5 Percent or Less of a Class.
     
    Item 6.Ownership of more than 5 Percent on Behalf of Another Person.
     
    Not Applicable
    Item 7.Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
     
    Not Applicable
    Item 8.Identification and Classification of Members of the Group.
     
    Not Applicable
    Item 9.Notice of Dissolution of Group.
     
    Not Applicable

    Item 10.Certifications:
     
    By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

        SIGNATURE 
     
    After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

     
    MAGNETAR FINANCIAL LLC
     
    Signature:/s/ Hayley Stein
    Name/Title:Hayley Stein, Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
    Date:08/08/2025
     
    MAGNETAR CAPITAL PARTNERS LP
     
    Signature:/s/ Hayley Stein
    Name/Title:Hayley Stein, Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
    Date:08/08/2025
     
    SUPERNOVA MANAGEMENT LLC
     
    Signature:/s/ Hayley Stein
    Name/Title:Hayley Stein, Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
    Date:08/08/2025
     
    DAVID J. SNYDERMAN
     
    Signature:/s/ Hayley Stein
    Name/Title:Hayley Stein, Attorney-in-fact for David J. Snyderman, Manager of Supernova Management LLC
    Date:08/08/2025

    Comments accompanying signature:  MAGNETAR FINANCIAL LLC BY: Magnetar Capital Partners LP, its Sole Member BY: Supernova Management LLC, its General Partner MAGNETAR CAPITAL PARTNERS LP By: Supernova Management LLC, its General Partner
    Exhibit Information

    99.1 Joint Filing Agreement, dated as of August 8, 2025, among the Reporting Persons. 99.2 Power of Attorney, dated as of December 22, 2022 filed by the Reporting Persons on August 8, 2025.

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