7 insiders reported 57 Form 4 transactions for NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND (NMZ) over the past 18 months (most recent 2026-08-06). Recent activity: MERRILL LYNCH, PIERCE, FENNER & SMITH INC. (10% Owner) Buy 1 shares, MERRILL LYNCH, PIERCE, FENNER & SMITH INC. (10% Owner) Sell 1 shares, BANK OF AMERICA CORP /DE/ (10% Owner) Buy 1 shares, MERRILL LYNCH, PIERCE, FENNER & SMITH INC. (10% Owner) Buy 1 shares, BANK OF AMERICA CORP /DE/ (10% Owner) Buy 1 shares. Source: SEC Form 4.
Source: SEC Form 4 filings · as of 2026-08-06