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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)

SCHEDULE 13D/A 0000070858 XXXXXXXX LIVE 8 ADJUSTABLE RATE MUNIFUND TERM PREFERRED SHARES 12/11/2025 false 0001266585 670682111 NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 333 W WACKER DRIVE CHICAGO IL 60606 BANK OF AMERICA CORPORATION 980-388-3188 BANK OF AMERICA CORPORATE CENTER 100 N. TRYON STREET Charlotte NC 28255 0000070858 N BANK OF AMERICA CORP /DE/ b WC Y DE 0.00 1870.00 0.00 1870.00 1870.00 N 52.4 HC 0001565450 N Banc of America Preferred Funding Corp b WC N DE 0.00 1870.00 0.00 1870.00 1870.00 N 52.4 CO ADJUSTABLE RATE MUNIFUND TERM PREFERRED SHARES NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 333 W WACKER DRIVE CHICAGO IL 60606 This Amendment No. 8 (this "Amendment") amends, as set forth below, the statement on Schedule 13D, dated December 21, 2012 and filed with the SEC on December 28, 2012, (as amended to the date hereof, the "Original Schedule 13D"), for Bank of America Corporation ("BAC") and Banc of America Preferred Funding Corporation ("BAPFC") (collectively, the "Reporting Persons") with respect to the Adjustable Rate Muni Fund Term Preferred Shares ("AMTP Shares") of Nuveen Municipal High Income Opportunity Fund (the "Issuer"). This amendment is being filed in relation to the transfer by BAPFC of 1,000 AMTP series 2032 shares (CUSIP No. 670682111) into a tender option trust arrangement designated as the TOB Series 2025-BAP0001 Trust (the "TOB Trust") on December 11, 2025. The TOB Trust has title to such 1,000 AMTP Shares but does not independently have the power to dispose or direct the disposition of the AMTP Shares. BAPFC, as a beneficiary of the Trust and through its contractual rights, retains an indirect beneficial ownership in the AMTP Shares, including with respect to the voting rights on the AMTP Shares, which additionally remain subject to the Voting Trust. The 870 AMTP series 2028 shares (CUSIP No. 670682889) held by BAPFC and referenced in the responses of the Reporting Persons to Rows (7) through (11) of the cover pages were not transferred into the TOB Trust and remain directly held by BAPFC. Item 2(c) of the Original Schedule 13D is hereby amended by deleting Schedule I referenced therein and replacing it with Schedule I included with this Amendment. Item 2(d) of the Original Schedule 13D is hereby amended by deleting Schedule II referenced therein and replacing it with Schedule II included with this Amendment. The responses of the Reporting Persons to Rows (7) through (11) of the cover pages of this Statement are incorporated herein by reference. The responses of the Reporting Persons to Rows (7) through (11) of the cover pages of this Statement are incorporated herein by reference. On December 11, 2025, Banc of America Preferred Funding Corporation ("BAPFC") deposited 1,000 AMTP series 2032 shares (CUSIP No. 670682111) into a tender option trust arrangement designated as the TOB Series 2025-BAP0001 Trust (the "TOB Trust") on December 11, 2025. The TOB Trust has title to such 1,000 AMTP Shares but does not independently have the power to dispose or direct the disposition of the AMTP Shares. PFC, as a beneficiary of the Trust and through its contractual rights, retains an indirect beneficial ownership in the RVMTP Shares, including with respect to the voting rights on the AMTP Shares, which additionally remain subject to the Voting Trust. The 870 AMTP series 2028 shares (CUSIP No. 670682889) held by BAPFC and referenced in the responses of the Reporting Persons to Rows (7) through (11) of the cover pages were not transferred into the TOB Trust and remain directly held by BAPFC. No other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the transfer of, the AMTP Shares beneficially owned by the Reporting Persons. Not applicable Item 6 of the Original Schedule 13D is hereby amended by adding the following language after the last paragraph thereof: On December 11, 2025, Banc of America Preferred Funding Corporation ("BAPFC") deposited 1,000 AMTP Shares into a tender option trust arrangement designated as the TOB Series 2025-BAP0001 Trust (the "TOB Trust") pursuant to the TOB Trust Agreement, dated December 11, 2025, among FMSBonds, Inc, as Trustor, Wilmington Trust, National Association, as Delaware Trustee, Wilmington Trust, National Association, as Trustee Wilmington Trust, National Association, as Tender Agent, Bank of America, National Association, solely in its capacity as the Tender Option Provider and BAPFC. The TOB Trust has title to such 1,000 AMTP Shares but does not independently have the power to dispose or direct the disposition of the AMTP Shares. PFC, as a beneficiary of the Trust and through its contractual rights, retains an indirect beneficial ownership in the AMTP Shares, including with respect to the voting rights on the AMTP Shares, which additionally remain subject to the Voting Trust. Such tender option bond arrangement additionally is related to that certain Custody Agreement by and among Wilmington Trust, National Association, as custodian FMSBonds, Inc., as depositor and BAPFC, dated December 11, 2025. Item 7 of the Original Schedule 13D is hereby amended by deleting Exhibit 99.1 and Exhibit 99.2 thereto and the insertion of the following exhibits: Exhibit Description of Exhibit 99.1 Joint Filing Agreement 99.2 Power of Attorney 99.7 Schedule I 99.8 Schedule II 99.9 TOB Trust Agreement dated December 11, 2025 99.10 Custody Agreement dated December 11, 2025 BANK OF AMERICA CORP /DE/ Andres Ortiz Authorized Signatory 12/15/2025 Banc of America Preferred Funding Corp Andres Ortiz Authorized Signatory 12/15/2025