Nuveen Municipal (NMZ) vice president adds 100 fund shares in open-market buy

Rhea-AI Filing Summary

Nuveen Municipal High Income Opportunity Fund vice president William A. Siffermann reported an open-market purchase of common shares. On March 5, 2026, he bought 100 shares at an average price of $10.4785 per share. Following this transaction, his directly owned stake increased to 913.9717 shares of the fund’s common stock.

Insider Trade Summary

Net Buyer: 100 shares

Net Buy 1 txn

Insider Siffermann William A

Role Vice President

Bought 100 shs ($1K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	100	$10.4785	$1K

Holdings After Transaction: Common Stock — 913.9717 shares (Direct)

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 03/06/2026 - 05:45 PM Learn about SEC filing dates

FAQ

What insider transaction did NMZ report for William A. Siffermann?

Nuveen Municipal High Income Opportunity Fund reported that vice president William A. Siffermann bought 100 common shares. The open-market purchase occurred on March 5, 2026 at an average price of $10.4785 per share, increasing his directly owned holdings.

How many NMZ shares did the insider buy and at what price?

William A. Siffermann purchased 100 shares of Nuveen Municipal High Income Opportunity Fund common stock. The transaction was executed in the open market at an average price of $10.4785 per share, according to the Form 4 insider trading report.

What is William A. Siffermann’s NMZ share ownership after this trade?

After the reported purchase, William A. Siffermann directly owns 913.9717 shares of Nuveen Municipal High Income Opportunity Fund common stock. This updated ownership figure reflects the addition of 100 shares acquired in the March 5, 2026 open-market transaction.

Was the recent NMZ insider trade a buy or a sell?

The recent insider trade in Nuveen Municipal High Income Opportunity Fund by vice president William A. Siffermann was a buy. He completed an open-market purchase of 100 common shares, as indicated by transaction code P on the Form 4 filing.

What role does the insider in the latest NMZ Form 4 hold?

The insider in the latest Nuveen Municipal High Income Opportunity Fund Form 4, William A. Siffermann, serves as a vice president. His reported transaction involved buying 100 common shares in the open market, increasing his directly held position in the fund.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Siffermann William A

(Last) (First) (Middle)

C/O NUVEEN INVESTMENTS

333 W. WACKER DRIVE

(Street)

CHICAGO IL 60606

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND [ NMZ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice President

3. Date of Earliest Transaction (Month/Day/Year)
03/05/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/05/2026		P		100	A	$10.4785	913.9717	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

siffermannpoa.txt

	Mark L. Winget/ Signed Under POA	03/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.