Welcome to our dedicated page for NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND SEC filings (Ticker: NMZ), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
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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.
Bank of America Corporation and Banc of America Preferred Funding Corp filed Amendment No. 9 to update their Schedule 13D for Nuveen Municipal High Income Opportunity Fund’s Adjustable Rate MuniFund Term Preferred Shares. They report beneficial ownership of 1,870 preferred shares, representing 23.2% of this preferred class, after the issuer’s reorganization and the April 27, 2026 issuance of new Series 1 Variable Rate Demand Preferred Shares.
Nuveen Municipal High Income Opportunity Fund amends its Prospectus Supplement effective April 24, 2026 to name Virtu Americas LLC as Nuveen Securities’ sub-placement agent for at-the-market sales of Common Shares and to specify the variable commission mechanics. The supplement defines 75% and 25% splits of the premium to net asset value and ties each split to compensation caps of 0.80% and 0.20% of aggregate gross sales proceeds, respectively. Settlements of sales will occur on the first business day following each sale.
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.
NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND reported an initial insider ownership filing for executive Joseph Castro. He serves as EVP, Chief Risk & Compliance. This Form 3 does not list any share transactions, functioning as a baseline disclosure of his reporting status with the fund.
Nuveen Municipal High Income Opportunity Fund and its sister Nuveen municipal closed‑end funds report modest returns and continued use of leverage for the year ended October 31, 2025. NMZ returned 2.16% at net asset value, trailing the S&P Municipal Yield Index’s 3.19%. NVG, NZF, NMCO and NDMO also underperformed their respective blended or S&P municipal benchmarks over the same period.
For NMZ, the common share NAV was $10.61 and the market price was $10.65, a 0.38% premium to NAV. The fund paid steady monthly distributions of $0.0655 per share, totaling $0.7860 and producing a 7.38% market yield, with a 12.46% taxable‑equivalent yield. Effective leverage was 39.76% and regulatory leverage 22.26%, with 49.7% of portfolio holdings not rated by major agencies.
During the period, NMZ was authorized to issue additional common shares via an equity shelf program and sold 5,710,888 shares at a 1.23% weighted average premium to NAV. The Board reauthorized share repurchases of up to about 10% of outstanding common shares, though NMZ has not repurchased any shares to date. The auditor issued an unqualified opinion on the funds’ financial statements. The Board also approved a merger of three state‑specific Nuveen municipal funds into NMZ, pending shareholder approval and other conditions.
Bank of America Corporation and its subsidiary Merrill Lynch, Pierce, Fenner & Smith Incorporated reported transactions in common shares of Nuveen Municipal High Income Opportunity Fund (NMZ) as indirect beneficial owners. On 12/19/2025, they reported buying 1,000 NMZ common shares at a price of $10.3191 per share and selling 1,000 NMZ common shares at a price of $10.54 per share, leaving them with 0 shares beneficially owned after the reported sale. The filing states that Bank of America’s interest is indirect through its 100% ownership of Merrill Lynch, and both reporting persons disclaim beneficial ownership beyond any pecuniary interest. They also state that, without conceding greater-than-10% owner status or Section 16 applicability, any profit potentially recoverable under Section 16(b) from these transactions will be remitted to the fund.