[SCHEDULE 13D/A] NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND Amended Major Shareholder Report

Rhea-AI Filing Summary

Wells Fargo & Company and its affiliate Wells Fargo Municipal Capital Strategies, LLC amended their Schedule 13D for Nuveen Municipal High Income Opportunity Fund preferred shares. They report beneficial ownership of 6,204 preferred shares, representing 76.84% of the class, with shared voting and dispositive power.

The amendment reflects an April 27, 2026 reorganization in which Capital Strategies exchanged VRDP shares of two Nuveen funds (NXJ and NQP) for 4,504 Series 1 VRDP Shares of the issuer and also holds 1,700 Series 2031 AMTP Shares. The filing describes voting trust arrangements that govern certain voting and consent rights on these preferred shares.

Key Figures

Preferred shares owned: 6,204 shares Ownership percentage: 76.84% Series 1 VRDP Shares: 4,504 shares +5 more

8 metrics

Preferred shares owned 6,204 shares Beneficially owned preferred shares of NMZ

Ownership percentage 76.84% Percent of NMZ preferred share class

Series 1 VRDP Shares 4,504 shares Series 1 VRDP Shares of NMZ (CUSIP 670682855)

Series 2031 AMTP Shares 1,700 shares Series 2031 AMTP Shares of NMZ (CUSIP 670682871)

Event date April 27, 2026 Date of reorganization triggering the amendment

Original NXJ VRDP Series 2 1,443 shares Series 2 NXJ VRDP Shares exchanged

Original NXJ VRDP Series 3 886 shares Series 3 NXJ VRDP Shares exchanged

Original NQP VRDP Series 2 and 3 1,125 and 1,050 shares NQP Series 2 and 3 VRDP Shares exchanged

Key Terms

Variable Rate Demand Preferred Shares (VRDP), AMTP Shares, Schedule 13D, Voting Trust, +2 more

6 terms

Variable Rate Demand Preferred Shares (VRDP) financial

"Initial Series 1 Variable Rate Demand Preferred Shares (VRDP) Adjustable Rate Special Rate Period Purchase Agreement"

AMTP Shares financial

"Series 2031 AMTP Shares of the Issuer (CUSIP: 670682871) which were reported on the Original"

Schedule 13D regulatory

"voting and consent rights on the Reporting Persons' Series 2031 AMTP Shares of the Issuer ... as reported on the Original 13D"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

Voting Trust financial

"Voting and consent rights on the VRDP Shares not assigned to the Series 1 Voting Trust have been retained"

A voting trust is an arrangement where shareholders temporarily transfer their voting rights to one or more trusted individuals (trustees) who vote on company matters on their behalf. It matters to investors because it consolidates decision-making power—like handing the car keys to a single driver for a journey—which can stabilize leadership or push through strategic plans but also reduces individual shareholders’ direct influence and can affect the company’s direction and stock value.

Limited Power of Attorney regulatory

"Exhibit Description of Exhibit 99.2 Limited Power of Attorney"

Joint Filing Agreement regulatory

"Exhibit Description of Exhibit 99.1 Joint Filing Agreement"

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 04/29/2026 - 04:08 PM Learn about SEC filing dates

FAQ

What does Wells Fargo disclose in this NMZ Schedule 13D/A amendment?

The amendment discloses that Wells Fargo & Company and its affiliate beneficially own 6,204 preferred shares of Nuveen Municipal High Income Opportunity Fund, representing 76.84% of that preferred class, with shared voting and dispositive power and updated details on related voting trust arrangements.

How many NMZ preferred shares does Wells Fargo beneficially own?

Wells Fargo & Company and Wells Fargo Municipal Capital Strategies, LLC report beneficial ownership of 6,204 preferred shares of Nuveen Municipal High Income Opportunity Fund, equal to 76.84% of the preferred share class, with all voting and dispositive power reported as shared between the two reporting persons.

What reorganization triggered the updated NMZ Schedule 13D/A filing?

The amendment follows the reorganization of Nuveen Pennsylvania Quality Municipal Income Fund (NQP) and Nuveen New Jersey Quality Municipal Income Fund (NXJ) into Nuveen Municipal High Income Opportunity Fund on April 27, 2026, which changed Capital Strategies’ preferred holdings into new VRDP shares of the issuer.

What preferred share series of NMZ does Wells Fargo’s affiliate hold?

Wells Fargo Municipal Capital Strategies, LLC holds 4,504 Series 1 Variable Rate Demand Preferred (VRDP) Shares with CUSIP 670682855 and 1,700 Series 2031 AMTP Shares with CUSIP 670682871, which together total the 6,204 preferred shares reported as beneficially owned in the amendment.

How were NXJ and NQP VRDP shares exchanged in the NMZ reorganization?

Capital Strategies exchanged 1,443 Series 2 and 886 Series 3 VRDP shares of NXJ and 1,125 Series 2 and 1,050 Series 3 VRDP shares of NQP for 4,504 Series 1 VRDP Shares of Nuveen Municipal High Income Opportunity Fund in the April 27, 2026 reorganization transaction.

What voting trust arrangements affect NMZ preferred shares held by Wells Fargo?

Voting and consent rights on the Series 2031 AMTP Shares remain subject to a voting trust reported in the original Schedule 13D. For the newly acquired Series 1 VRDP Shares, certain preferred class voting rights were assigned to a separate Series 1 Voting Trust with Glass Lewis & Co., LLC as trustee and consultant.

What agreements are referenced in the updated NMZ Schedule 13D/A exhibits?

The amendment replaces earlier exhibits with a Joint Filing Agreement and Limited Power of Attorney, and adds exhibits including amended and restated schedules, an Initial Series 1 VRDP Adjustable Rate Special Rate Period Purchase Agreement dated April 27, 2026, and a Voting Trust Agreement and its April 24, 2026 amendment.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

(Name of Issuer)

PREFERRED SHARES

(Title of Class of Securities)

670682871 (CUSIP Number) 670682855 (CUSIP Number)

Vera Gurova, Senior Counsel
Wells Fargo& Company, 401 S. Tryon Street, 26th Floor
Charlotte, NC, 28202
(704) 339-2335

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

04/27/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 670682871, 670682855

1

Name of reporting person

Wells Fargo & Company

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 6,204.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 6,204.00

11

Aggregate amount beneficially owned by each reporting person

6,204.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

76.84 %

14

Type of Reporting Person (See Instructions)

HC

Comment for Type of Reporting Person:

Shares reported include both shares of the CUSIP 670682871listed on the cover page, and of CUSIP 670682855.

SCHEDULE 13D

CUSIP Number(s): 670682871, 670682855

1

Name of reporting person

Wells Fargo Municipal Capital Strategies, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 6,204.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 6,204.00

11

Aggregate amount beneficially owned by each reporting person

6,204.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

76.84 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Shares reported include both shares of the CUSIP 670682871 listed on the cover page, and of CUSIP 670682855.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: PREFERRED SHARES
(b)	Name of Issuer: NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND
(c)	Address of Issuer's Principal Executive Offices: 333 West Wacker Drive, Chicago, ILLINOIS , 60606.
Item 1 Comment: This Amendment No. 1 (this "Amendment") amends, as set forth below, the statement on Schedule 13D, dated April, 3, 2023 and filed with the SEC on April 12, 2023 (the "Original Schedule 13D"). as amended by Amendment No. 1 dated February 28, 2017 and filed with the SEC on March 2, 2017 ("Amendment No. 1") for Wells Fargo & Company ("Wells Fargo") and Wells Fargo Municipal Capital Strategies, LLC ("Capital Strategies") (collectively, the "Reporting Persons") with respect to certain preferred shares ("Preferred Shares") of Nuveen Municipal High Income Opportunity Fund (the "Issuer"). This Amendment is being filed as a result of the reorganization of Nuveen Pennsylvania Quality Municipal Income Fund ("NQP") and Nuveen New Jersey Quality Municipal Income Fund ("NXJ") with and into the Issuer on April 27, 2026 (the "Reorganization"), pursuant to which Capital Strategies exchanged its 1,443 Series 2 VRDP Shares of NXJ (CUSIP: 67069Y607), its 886 Series 3 VRDP Shares of NXJ (CUSIP: 67069Y706), its 1,125 Series 2 VRDP Shares of NQP (CUSIP: 670972603), and its 1,050 Series 3 VRDP Shares of NQP (CUSIP: 670972702) for 4,504 Series 1 VRDP Shares of the Issuer (CUSIP: 670682855). Capital Strategies additionally holds 1,700 Series 2031 AMTP Shares of the Issuer (CUSIP: 670682871) which were reported on the Original Schedule 13D.
Item 2.	Identity and Background
(c)	Item 2 of the Original Schedule 13D is hereby amended by deleting Schedule I and Schedule II referenced therein and replacing them with Schedule I and Schedule II included with this Amendment and attached as an Exhibit hereto.
(d)	Item 2 of the Original Schedule 13D is hereby amended by deleting Schedule I and Schedule II referenced therein and replacing them with Schedule I and Schedule II included with this Amendment and attached as an Exhibit hereto.
(e)	Item 2 of the Original Schedule 13D is hereby amended by deleting Schedule I and Schedule II referenced therein and replacing them with Schedule I and Schedule II included with this Amendment and attached as an Exhibit hereto.
(f)	Item 2 of the Original Schedule 13D is hereby amended by deleting Schedule I and Schedule II referenced therein and replacing them with Schedule I and Schedule II included with this Amendment and attached as an Exhibit hereto.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 of the Original Schedule 13D is hereby amended by adding the following paragraph at the end thereof: "In connection with the Reorganization of NXJ and NQP into the Issuer, Capital Strategies exchanged its 1,443 Series 2 VRDP Shares of NXJ (CUSIP: 67069Y607), its 886 Series 3 VRDP Shares of NXJ (CUSIP: 67069Y706), its 1,125 Series 2 VRDP Shares of NQP (CUSIP: 670972603), and its 1,050 Series 3 VRDP Shares of NQP (CUSIP: 670972702) for 4,504 Series 1 VRDP Shares of the Issuer (CUSIP: 670682855)."
Item 4.	Purpose of Transaction
	Item 4 of the Original Schedule 13D is hereby amended by adding the following paragraph at the end thereof: "In connection with the Reorganization of NXJ and NQP into the Issuer, Capital Strategies exchanged its 1,443 Series 2 VRDP Shares of NXJ (CUSIP: 67069Y607), its 886 Series 3 VRDP Shares of NXJ (CUSIP: 67069Y706), its 1,125 Series 2 VRDP Shares of NQP (CUSIP: 670972603), and its 1,050 Series 3 VRDP Shares of NQP (CUSIP: 670972702) for 4,504 Series 1 VRDP Shares of the Issuer (CUSIP: 670682855) pursuant to that certain Initial Series 1 Variable Rate Demand Preferred Shares (VRDP) Adjustable Rate Special Rate Period Purchase Agreement dated April 27, 2026."
Item 5.	Interest in Securities of the Issuer
(d)	Item 5(d) of the Original Schedule 13D is hereby amended to read: "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 sale of, AMTP Shares or VRDP Shares that may be deemed to be beneficially owned by the Reporting Persons."
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	Item 6 of the Original Schedule 13D is hereby amended by adding the following at the end of the first paragraph thereof: "Following the Reroganization the voting and consent rights on the Reporting Persons' Series 2031 AMTP Shares of the Issuer (CUSIP 670682871) will remain subject to the Voting Trust as reported on the Original 13D. With respect to the Series 1 VRDP Shares acquired by Capital Strategies in connection with the Reorganzation, on April 27, 2027, Capital Strategies assigned certain preferred class voting rights on such VRDP Shares to a voting trust (the "Series 1 Voting Trust") created pursuant to that certain Voting Trust Agreement, dated April 27, 2026 among Capital Strategies, Glass Lewis & Co., LLC, as voting trustee (the "Series 1 Voting Trustee") and Glass Lewis & Co., LLC, as voting consultant (the "Series 1 Voting Consultant"). Voting and consent rights on the VRDP Shares not assigned to the Series 1 Voting Trust have been retained by Capital Strategies. The Seriese Voting Trust provides that with respect to voting or consent matters relating to the voting rights assigned to the Series 1 Voting Trust, the Series 1 Voting Consultant analyzes such voting or consent matters and makes a recommendation to the Series 1 Voting Trustee on voting or consenting. The Series 1 Voting Trustee is obligated to follow any such recommendations of the Series 1 Voting Consultant when providing a vote or consent.
Item 7.	Material to be Filed as Exhibits.
	Item 7 of the Original Schedule 13D is hereby amended by deleting Exhibit 99.1 and Exhibit 99.2 thereto and inserting the following exhibits in their place: "Exhibit Description of Exhibit 99.1 Joint Filing Agreement 99.2 Limited Power of Attorney" Item 7 of the Original Schedule 13D is hereby further amended by adding the following Exhibit to the listings of exhibits to be attached to this Schedule 13D: "Exhibit Description of Exhibit 99.5 Amended and Restated Schedule I and Schedule II 99.6 Initial Series 1 Variable Rate Demand Preferred Shares (VRDP) Adjustable Rate Special Rate Period Purchase Agreement, dated April 27, 2026 99.7 Voting Trust Agreement, dated April 27, 2026 99.8 Amendment to Voting Trust Agreement, dated April 24, 2026."

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.

Wells Fargo & Company

Signature:	/s/ Patricia Arce
Name/Title:	Patricia Arce, Designated Signer
Date:	04/29/2026

Wells Fargo Municipal Capital Strategies, LLC

Signature:	/s/ Daniel Frizsell
Name/Title:	Daniel Frizsell, Vice President
Date:	04/29/2026

Comments accompanying signature:

Please note that Item 2 of the Original Schedule 13D is hereby amended by deleting Schedule I and Schedule II referenced therein and replacing them with the amended and restated Schedule I and Schedule II attached to this Amendment.