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    Amendment: SEC Form SCHEDULE 13G/A filed by Pioneer Municipal High Income Fund Inc.

    8/5/25 11:34:54 AM ET
    $MHI
    Investment Managers
    Finance
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    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549


    SCHEDULE 13G


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


    Pioneer Municipal High Income Fund, Inc.

    (Name of Issuer)


    Common Stock

    (Title of Class of Securities)


    723763108

    (CUSIP Number)


    07/31/2025

    (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.
    723763108


    1Names of Reporting Persons

    Sit Investment Associates, Inc.
    2Check the appropriate box if a member of a Group (see instructions)

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

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

    0.00
    6Shared Voting Power

    2,614,270.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    2,614,270.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    2,614,270.00
    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)

    11.5 %
    12Type of Reporting Person (See Instructions)

    IA


    SCHEDULE 13G

    CUSIP No.
    723763108


    1Names of Reporting Persons

    Sit Fixed Income Advisors II, LLC
    2Check the appropriate box if a member of a Group (see instructions)

    Checkbox not checked  (a)
    Checkbox 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

    2,614,270.00
    7Sole Dispositive Power

    0.00
    8Shared Dispositive Power

    2,614,270.00
    9Aggregate Amount Beneficially Owned by Each Reporting Person

    2,614,270.00
    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)

    11.5 %
    12Type of Reporting Person (See Instructions)

    IA


    SCHEDULE 13G

    Item 1. 
    (a)Name of issuer:

    Pioneer Municipal High Income Fund, Inc.
    (b)Address of issuer's principal executive offices:

    60 State Street, Boston, MA 02109
    Item 2. 
    (a)Name of person filing:

    Sit Investment Associates, Inc. Sit Fixed Income Advisors II, LLC
    (b)Address or principal business office or, if none, residence:

    80 South Eighth Street, Suite 3300 Minneapolis, MN 55402
    (c)Citizenship:

    Sit Investment Associates, Inc. Minnesota Corporation Sit Fixed Income Advisors II, LLC Delaware LLC
    (d)Title of class of securities:

    Common Stock
    (e)CUSIP No.:

    723763108
    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 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:

    See response to item 9 on each cover page.
    (b)Percent of class:

    See response to item 11 on each cover page.
    (c)Number of shares as to which the person has:
     (i) Sole power to vote or to direct the vote:

    See response to item 5 on each cover page.

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

    See response to item 6 on each cover page.

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

    See response to item 7 on each cover page.

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

    See response to item 8 on each cover page. The ownership percentages reported are based on 22,771,349 shares of common stock outstanding as of April 30, 2025, as reported in the Issuer's Report on Form N-CSR filed with the Securities Exchange Commission. Sit Investment Associates, Inc. ("SIA") is an investment adviser registered under section 203 of the Investment Advisers Act of 1940. Sit Fixed Income Advisors II, LLC ("SFI") is an investment adviser registered under section 203 of the Investment Advisers Act of 1940 and a subsidiary of SIA. SIA and SFI provide investment management services to client accounts ("Accounts"). In their roles as investment advisers SIA and SFI possess shared voting and investment power over securities of the Issuer described in this schedule 13G owned by the Accounts and may be deemed to be the beneficial owner of such shares of the Issuer owned by the Accounts. All securities reported in this schedule 13G are owned by the Accounts. Pursuant to Rule 13d-4 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), SIA and SFI disclaim beneficial ownership of such securities.

    Item 5.Ownership of 5 Percent or Less of a Class.
     
    Item 6.Ownership of more than 5 Percent on Behalf of Another Person.
     
    If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.


    The Accounts are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities. Except as may be indicated if this is a joint filing with a registered investment company managed by SIA or SFI, not more than 5% of the class of such securities is owned by any one Account subject to the investment advice of SIA or SFI.
    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.

     
    Sit Investment Associates, Inc.
     
    Signature:/s/ Paul E. Rasmussen
    Name/Title:Paul Rasmussen / Vice President
    Date:08/05/2025
     
    Sit Fixed Income Advisors II, LLC
     
    Signature:/s/ Paul E. Rasmussen
    Name/Title:Paul Rasmussen / Vice President
    Date:08/05/2025
    Exhibit Information

    Exhibit A - Joint Filing Agreement

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