Nuveen Municipal High Income Opportunity Fund

NMZNYSEFinancial Services● Active

$10.18

+$0.00(+0.00%)

Market Cap$1.2B

P/E Ratio—

52W High$10.77

52W Low$9.83

Avg Volume565K

Open$10.18

Beta0.73

Insider Trades Ownership Employees

Nuveen Municipal High Income Opportunity Fund (NMZ) Insider Trading

Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.

SEC EDGAR · FMP · NMZ · as of Jun 8, 2026

Activity summary

Buy transactions

P-Purchase only

Sell transactions

12 Months

Buy/Sell ratio

1.25

Buy/Sell (by trades)

Overall sentiment

BULLISH

↑ Buy 56%Active transactions only · RSU vesting excluded44% Sell ↓

Nuveen Municipal High Income Opportunity Fund insiders have been net buyers of shares over the past 12 Months, which may signal confidence in the company's outlook.

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only

As of Jun 8, 2026

NMZ insider buying and selling by quarter

NMZ insider selling · NMZ insider buying stocks · quarterly insider activity

Total insider buying (incl. awards)Total insider selling

11K5K0

2023 Q4

2024 Q1

2024 Q4

2025 Q1

2025 Q3

2025 Q4

2026 Q1

2026 Q2

Mobile shows last 4Q · Desktop shows full 8Q

▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters

As of Jun 8, 2026

Active insiders

Most active in past 12 months · NMZ ceo insider trading

Showing all insiders · Click a card to filter the transactions table below

▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API

Recent insider transactions

NMZ executive sell shares · NMZ board member insider trading · NMZ insider trading SEC filing

Showing 46 most recent · Common Stock · Form 4 only

Scroll horizontally to see all columns

Date	Insider	Type	Shares	Price	Value	After trans.	Filing
Mar 5, 2026	Siffermann William A VP	Purchase	100	$10.48	$1K	913.972	Form 4
Mar 21, 2025	Siffermann William A VP	Purchase	300	$11.07	$3K	609.806	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	7,000	$13.54	$95K	7,000	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	1,000	$13.53	$14K	6,000	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	100	$13.53	$1K	5,900	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	100	$13.53	$1K	5,800	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	100	$13.53	$1K	5,700	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	50	$13.53	$677	5,650	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	100	$13.53	$1K	5,550	Form 4
Nov 8, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	500	$13.53	$7K	5,050	Form 4
Jun 17, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	1,340	$14.60	$20K	2,140	Form 4
Jun 17, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	590	$14.59	$9K	800	Form 4
Jun 20, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	1,340	$14.56	$20K	800	Form 4
Sep 27, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	488	$14.58	$7K	488	Form 4
Jun 17, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	210	$14.60	$3K	210	Form 4
Jun 20, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	590	$14.53	$9K	210	Form 4
Dec 29, 2014	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	200	$13.38	$3K	200	Form 4
Jan 15, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	15	$13.84	$208	15	Form 4
Aug 11, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	4	$15.06	$60	4	Form 4
Jan 22, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	15	$13.80	$207	0	Form 4
Mar 10, 2015	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	679	$13.83	$9K	0	Form 4
Oct 3, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	488	$14.48	$7K	0	Form 4
Dec 30, 2014	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	200	$13.35	$3K	0	Form 4
Sep 22, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Purchase	132	$14.59	$2K	0	Form 4
Sep 6, 2016	BANK OF AMERICA CORP /DE/ 10 percent owner	Sale	132	$15.08	$2K	0	Form 4

Siffermann William A

Purchase

Date

Mar 5

100

Price

$10.48

Value

$1K

View Form 4 on SEC.gov

Siffermann William A

Purchase

Date

Mar 21

300

Price

$11.07

Value

$3K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Nov 8

7,000

Price

$13.54

Value

$95K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

1,000

Price

$13.53

Value

$14K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

100

Price

$13.53

Value

$1K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

100

Price

$13.53

Value

$1K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

100

Price

$13.53

Value

$1K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

Price

$13.53

Value

$677

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

100

Price

$13.53

Value

$1K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Nov 8

500

Price

$13.53

Value

$7K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Jun 17

1,340

Price

$14.60

Value

$20K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Jun 17

590

Price

$14.59

Value

$9K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Jun 20

1,340

Price

$14.56

Value

$20K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Sep 27

488

Price

$14.58

Value

$7K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Jun 17

210

Price

$14.60

Value

$3K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Jun 20

590

Price

$14.53

Value

$9K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Dec 29

200

Price

$13.38

Value

$3K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Jan 15

Price

$13.84

Value

$208

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Aug 11

Price

$15.06

Value

$60

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Jan 22

Price

$13.80

Value

$207

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Mar 10

679

Price

$13.83

Value

$9K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Oct 3

488

Price

$14.48

Value

$7K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Dec 30

200

Price

$13.35

Value

$3K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Purchase

Date

Sep 22

132

Price

$14.59

Value

$2K

View Form 4 on SEC.gov

BANK OF AMERICA CORP /DE/

10 percent owner

Sale

Date

Sep 6

132

Price

$15.08

Value

$2K

View Form 4 on SEC.gov

⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar

1 / 2

▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —

About NMZ insider trading

NMZ insider trades

Nuveen Municipal High Income Opportunity Fund (NMZ) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Siffermann William A (VP). Over the past 12 months, 1 insiders have filed transactions with the SEC. NMZ insiders have been primarily buying, which may reflect pre-scheduled Rule 10b5-1 plan executions.

For Nuveen Municipal High Income Opportunity Fund's institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →

Buy/Sell signal logic

acquisitionOrDisposition field:

A = Acquisition (buy) · D = Disposition (sell)

RSU vesting (M-Exempt) excluded from sentiment

Form 4SEC filing required within 2 business days of any insider transaction

10b5-1Pre-scheduled trading plan that allows insiders to sell on autopilot

Open MktDirect purchase or sale on the open market (excludes awards, options)

Ownership SEC filings Financial statements Price history Forecast & ratings Earnings

Frequently asked questions

NMZ insider trading · 5 questions

The insiders of Nuveen Municipal High Income Opportunity Fund (NMZ) include executives and directors such as Siffermann William A (VP), among others. Over the past 12 months, 1 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.

NMZ board member insider tradingwho are NMZ insidersNMZ insider rosterNuveen Municipal High Income Opportunity Fund executives insider activity

▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026