4 insiders reported 30 Form 4 transactions for NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND (NMZ) over the past 18 months (most recent 2026-03-06). Recent activity: Siffermann William A (Vice President) Buy 100 shares, BANK OF AMERICA CORP /DE/ (Insider) Buy 1,000 shares, MERRILL LYNCH, PIERCE, FENNER & SMITH INC. (Insider) Buy 1,000 shares, BANK OF AMERICA CORP /DE/ (Insider) Sell 1,000 shares, MERRILL LYNCH, PIERCE, FENNER & SMITH INC. (Insider) Sell 1,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-06 | Siffermann William A | Vice President | Buy | 100 | $1,048 |
| 2025-12-22 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 1,000 | $10,320 |
| 2025-12-22 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Buy | 1,000 | $10,320 |
| 2025-12-22 | BANK OF AMERICA CORP /DE/ | Insider | Sell | 1,000 | $10,540 |
| 2025-12-22 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Sell | 1,000 | $10,540 |
| 2025-12-15 | BANK OF AMERICA CORP /DE/ | Insider | Sell | 1,000 | $0 |
| 2025-12-15 | Banc of America Preferred Funding Corp | Insider | Sell | 1,000 | $0 |
| 2025-12-15 | Banc of America Preferred Funding Corp | Insider | Buy | 1,000 | $0 |
| 2025-12-15 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 1,000 | $0 |
| 2025-10-14 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Sell | 6,440 | $68,522 |
| 2025-10-14 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Buy | 6,440 | $68,006 |
| 2025-10-14 | BANK OF AMERICA CORP /DE/ | Insider | Sell | 6,440 | $68,522 |
| 2025-10-14 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 6,440 | $68,006 |
| 2025-10-10 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 190 | $2,018 |
| 2025-10-10 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Buy | 190 | $2,018 |
| 2025-10-10 | BANK OF AMERICA CORP /DE/ | Insider | Sell | 190 | $2,018 |
| 2025-10-10 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Sell | 190 | $2,018 |
| 2025-09-19 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 10,784 | $114,850 |
| 2025-09-19 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Buy | 10,784 | $114,850 |
| 2025-09-19 | BANK OF AMERICA CORP /DE/ | Insider | Sell | 10,784 | $113,879 |
| 2025-09-19 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Sell | 10,784 | $113,879 |
| 2025-03-24 | Siffermann William A | Vice President | Buy | 300 | $3,324 |
| 2025-01-17 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 1 | $11 |
| 2025-01-17 | MERRILL LYNCH, PIERCE, FENNER & SMITH INC. | Insider | Buy | 1 | $11 |
| 2025-01-17 | BANK OF AMERICA CORP /DE/ | Insider | Buy | 5 | $54 |
Source: SEC Form 4 filings · as of 2026-03-06