13D Filings
NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
NMZ
Amendment
Ownership

52.40%

Total Shares

1,870

Issuer CIK

1266585

CUSIP

670682111

Event Date

Dec 10, 2025

Accepted

Dec 15, 2025, 04:47 PM

Reporting Persons (2)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
BANK OF AMERICA CORP /DE/
Holding Company
52.40%1,87001,870
Banc of America Preferred Funding Corp
CO
52.40%1,87001,870
Disclosure Items (5)

Security Title

ADJUSTABLE RATE MUNIFUND TERM PREFERRED SHARES

Issuer Name

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

Issuer Address

333 W WACKER DRIVE, CHICAGO, IL, 60606

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.

Percentage of Class

The responses of the Reporting Persons to Rows (7) through (11) of the cover pages of this Statement are incorporated herein by reference.

Number of Shares

The responses of the Reporting Persons to Rows (7) through (11) of the cover pages of this Statement are incorporated herein by reference.

Transactions

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.

Shareholders

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.

Date of 5% Ownership

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

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND — Schedule 13D | 13D Filings