Nuveen Municipal High Income Opportunity Fund
Nuveen Municipal High Income Opportunity Fund (NMZ) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · NMZ · as of Sep 30, 2025
Ownership Breakdown
124
Institutional Holders
▼ 3 vs Q2
$184.85M
Total Inst. Value
▲ $6.66M vs Q2
117.50M
Shares Outstanding
freeFloat 99.99%
18.68M
13F Shares Held
▲ 1.49M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
NMZ largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
MORGAN STANLEY | 2.49M | 2.23% | 2.23% | $26.37B | May 27, 2026 | ▼ 192.4K |
UBS GROUP AG | 1.96M | 1.75% | 1.75% | $20.74B | Nov 13, 2025 | ▲ 183.7K |
GRIDIRON PARTNERS, LLC | 1.65M | 1.48% | 1.48% | $4.60B | Oct 14, 2025 | ▲ 1.22M |
GUGGENHEIM CAPITAL LLC | 1.64M | 1.47% | 1.47% | $17.42B | Nov 13, 2025 | ▲ 102.7K |
RAYMOND JAMES FINANCIAL INC | 1.13M | 1.01% | 1.01% | $11.92B | Nov 14, 2025 | ▲ 100.5K |
WELLS FARGO & COMPANY/MN | 854.5K | 76.41% | 76.41% | $9.05B | Nov 13, 2025 | ▲ 41.8K |
HENNION & WALSH ASSET MANAGEMENT, INC. | 724.2K | 64.77% | 64.77% | $7.67B | Oct 22, 2025 | ▼ 27.4K |
LPL FINANCIAL LLC | 602.9K | 53.92% | 53.92% | $6.39B | Nov 12, 2025 | ▲ 132.3K |
MELONE PRIVATE WEALTH, LLC | 593.9K | 53.11% | 53.11% | $6.29B | Oct 17, 2025 | ▲ 26.0K |
BANK OF AMERICA CORP /DE/ | 546.4K | 48.87% | 48.87% | $5.79B | Feb 3, 2026 | ▼ 19.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
33
Increased
+2.30M shares0
New Positions
first time holders15
Decreased
−339.1K shares0
Sold Out
fully exitedNet shares change (top 50)
+1.96M
+2.30M / −339.1K
Net new holders
+18
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
NMZ insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
WELLS FARGO & COMPANY/MN 10 percent owner | Apr 27, 2026 | J-Other | 4,504 | — | — | 4.5K | Form 4 ↗ |
Siffermann William A Vice President | Mar 5, 2026 | Purchase | 100 | $10.48 | $1.0K | 913.972 | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Dec 19, 2025 | Purchase | 1,000 | $10.32 | $10.3K | 1.0K | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Dec 19, 2025 | Sale | 1,000 | $10.54 | $10.5K | 0 | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Dec 11, 2025 | J-Other | 1,000 | — | — | 1.0K | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Dec 11, 2025 | J-Other | 1,000 | — | — | 870 | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Oct 10, 2025 | Purchase | 6,440 | $10.56 | $68.0K | 6.4K | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Oct 10, 2025 | Sale | 6,440 | $10.63 | $68.5K | 0 | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Oct 9, 2025 | Purchase | 190 | $10.62 | $2.0K | 190 | Form 4 ↗ |
BANK OF AMERICA CORP /DE/ 10 percent owner | Oct 9, 2025 | Sale | 190 | $10.62 | $2.0K | 0 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Nuveen Municipal High Income Opportunity Fund (NMZ) is primarily owned by institutional investors, who hold approximately 15.9% of total shares outstanding. Company insiders own approximately 0.01%, while retail and public investors account for the remaining 84.10%.
The largest institutional shareholder of Nuveen Municipal High Income Opportunity Fund is MORGAN STANLEY, holding approximately 2.49 million shares — equal to 2.23% of outstanding shares — as of September 30, 2025.
A total of 124 institutional investors currently hold NMZ stock, with a combined institutional value of approximately $184,853,736 as of the most recent 13F filing period.
Frequently asked questions
NMZ ownershipNuveen Municipal High Income Opportunity Fund (NMZ) is primarily owned by institutional investors, who hold approximately 15.9% of shares. The largest shareholder is MORGAN STANLEY with a 2.23% stake. Company insiders hold 0.01%. Data sourced from SEC Form 13F as of September 30, 2025.