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    SEC Form SCHEDULE 13G filed by SEALSQ Corp

    10/15/25 5:50:48 PM ET
    $LAES
    Semiconductors
    Technology
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    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549


    SCHEDULE 13G


    UNDER THE SECURITIES EXCHANGE ACT OF 1934
    SEALSQ Corp

    (Name of Issuer)


    Ordinary Shares, $0.01 par value per share

    (Title of Class of Securities)


    G79483106

    (CUSIP Number)


    10/05/2025

    (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 not checked   Rule 13d-1(b)
    Checkbox checked   Rule 13d-1(c)
    Checkbox not checked   Rule 13d-1(d)






    SCHEDULE 13G

    CUSIP No.
    G79483106


    1Names of Reporting Persons

    CVI Investments, Inc.
    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

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

    0.00
    6Shared Voting Power

    16,810,511.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    16,810,511.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    16,810,511.00
    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)

    9.9 %
    12Type of Reporting Person (See Instructions)

    CO

    Comment for Type of Reporting Person:  With respect to Row 6 and Row 8 above, Heights Capital Management, Inc. is the investment manager to CVI Investments, Inc. and as such may exercise voting and dispositive power over the shares reported as beneficially owned by CVI Investments, Inc. herein.


    SCHEDULE 13G

    CUSIP No.
    G79483106


    1Names of Reporting Persons

    Heights Capital Management, Inc.
    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

    16,810,511.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    16,810,511.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    16,810,511.00
    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)

    9.9 %
    12Type of Reporting Person (See Instructions)

    CO

    Comment for Type of Reporting Person:  With respect to Row 6 and Row 8 above, Heights Capital Management, Inc. is the investment manager to CVI Investments, Inc. and as such may exercise voting and dispositive power over the shares reported as beneficially owned by CVI Investments, Inc. herein.


    SCHEDULE 13G

    Item 1. 
    (a)Name of issuer:

    SEALSQ Corp
    (b)Address of issuer's principal executive offices:

    Avenue Louis-Casai 58, 1216 Cointrin, Switzerland
    Item 2. 
    (a)Name of person filing:

    This statement is filed by the entities listed below, who are collectively referred to herein as "Reporting Persons," with respect to the Ordinary Shares of SEALSQ Corp (the "Company"), $0.01 par value per share (the "Shares"). (i) CVI Investments, Inc. (ii) Heights Capital Management, Inc.
    (b)Address or principal business office or, if none, residence:

    The address of the principal business office of CVI Investments, Inc. is: P.O. Box 309GT Ugland House South Church Street George Town Grand Cayman KY1-1104 Cayman Islands The address of the principal business office of Heights Capital Management, Inc. is: 101 California Street, Suite 3250 San Francisco, California 94111
    (c)Citizenship:

    Citizenship is set forth in Row 4 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person.
    (d)Title of class of securities:

    Ordinary Shares, $0.01 par value per share
    (e)CUSIP No.:

    G79483106
    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 not 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 not 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:

    The information required by this Item 4(a) is set forth in Row 9 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. The number of Shares reported as beneficially owned consists of (i) 200,000 Shares, and (ii) Shares issuable upon the exercise of pre-funded warrants and other warrants to purchase Shares (collectively, the "Warrants"). A portion of the Warrants are not exercisable to the extent that the total number of Shares then beneficially owned by a Reporting Person and its affiliates and any other persons whose beneficial ownership of Shares would be aggregated with such Reporting Person for purposes of Section 13(d) of the Exchange Act, would exceed 4.99%, and the remainder of the Warrants are not exercisable to the extent that the total number of Shares then beneficially owned by a Reporting Person and its affiliates and any other persons whose beneficial ownership of Shares would be aggregated with such Reporting Person for purposes of Section 13(d) of the Exchange Act, would exceed 9.99%. The Company's Prospectus Supplement (to Prospectus dated April 2, 2025, Registration No. 333-286098), filed on October 7, 2025, indicates there were 151,662,873 Shares outstanding as of the completion of the offering of the Shares referred to therein.
    (b)Percent of class:

    9.9  %
    (c)Number of shares as to which the person has:
     (i) Sole power to vote or to direct the vote:

    The information required by this Item 4(c)(i) is set forth in Row 5 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person.

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

    The information required by this Item 4(c)(ii) is set forth in Row 6 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. Heights Capital Management, Inc., which serves as the investment manager to CVI Investments, Inc., may be deemed to be the beneficial owner of all Shares owned by CVI Investments, Inc. Each of the Reporting Persons hereby disclaims any beneficial ownership of any such Shares, except for their pecuniary interest therein.

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

    The information required by this Item 4(c)(iii) is set forth in Row 7 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person.

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

    The information required by this Item 4(c)(iv) is set forth in Row 8 of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. Heights Capital Management, Inc., which serves as the investment manager to CVI Investments, Inc., may be deemed to be the beneficial owner of all Shares owned by CVI Investments, Inc. Each of the Reporting Persons hereby disclaims any beneficial ownership of any such Shares, except for their pecuniary interest therein.

    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 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.

     
    CVI Investments, Inc.
     
    Signature:/s/ Sarah Travis
    Name/Title:Sarah Travis, Assistant General Counsel and Assistant Secretary of Heights Capital Management, Inc.
    Date:10/15/2025
     
    Heights Capital Management, Inc.
     
    Signature:/s/ Sarah Travis
    Name/Title:Sarah Travis, Assistant General Counsel and Assistant Secretary
    Date:10/15/2025

    Comments accompanying signature:  Heights Capital Management, Inc. serves as authorized agent of CVI Investments, Inc. pursuant to a Limited Power of Attorney, a copy of which is attached as Exhibit I hereto.
    Exhibit Information

    EXHIBIT INDEX EXHIBIT DESCRIPTION ________ ________ I Limited Power of Attorney II Joint Filing Agreement

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