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NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

corporate_fare Company Profile

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

NMZ·NYSE·Unknown·CIK 0001266585

Nuveen Municipal High Income Opportunity Fund is a closed-end fixed income mutual fund. It was launched by Nuveen Investments Inc. and is co-managed by Nuveen Fund Advisors LLC and Nuveen Asset Management, LLC. The fund invests in the fixed income markets of the United States, primarily focusing on investment grade tax-exempt municipal securities. The fund was founded on November 19, 2003, and is based in the United States. It was formerly known as Nuveen Municipal High Yield Opportunity Fund.

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND (NYSE:NMZ) is a publicly traded company in the Unknown sector. Wiseek has independently scored 15 items for NMZ at importance 7 or higher on its 1–10 market-impact scale. Its most recent item scored 7 or higher is dated 2026-05-01, rated 8/10. Across its 15 most recent items scored 7 or higher, the top rating is 8/10, with 9 rated 8 or above. Recent SEC coverage for NMZ spans N-23C-2, 425.

Recent high-impact activity:

  • Nuveen Fund Notifies Intent to Redeem Up to $238M in Preferred Shares
  • Nuveen Municipal Funds Secure Shareholder Approval for Proposed Mergers
  • Nuveen Fund Adjourns Shareholder Meeting for Merger Vote to April 2, 2026
  • Nuveen Urges Shareholders to Vote on Merger by March 19 Meeting
  • Nuveen New Jersey Fund (NXJ) Merger Vote Adjourned to Solicit More Votes

Dilution Risk

Low risk

Filing-implied dilution signals for NMZ, detected from its recent SEC filings · based on capital-structure filings through 2026-04-24.

1 recent capital raise

⚠ A more recent filing has been published for this ticker since this signal was computed; it may not yet be reflected — see the filings below.

A filing-implied signal, not a realized share count. How Wiseek tracks dilution →

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$9.33
52-week range · as of 2026-05-01 $9.33 – $10.77
Market cap
$2.01B
Volume
1M (1.2× avg)
3-mo avg 880K
Live data · 2026-09-23 03:35 UTC · Market overnight

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feed NMZ - Latest Insights

NMZ
May 01, 2026, 1:22 PM EDT
Filing Type: N-23C-2
Importance Score:
8
Price at Filing: $10.18
Real-time Price: $9.33 info
Change: -$0.845 (-8%) info
Market Cap: $2.007B info
NMZ
Apr 02, 2026, 5:33 PM EDT
Source: Reuters
Importance Score:
8
Price at Filing: $10.33
Real-time Price: $9.33 info
Change: -$1.00 (-10%) info
Market Cap: $2.007B info
NMZ
Mar 19, 2026, 4:00 PM EDT
Filing Type: 425
Importance Score:
7
Price at Filing: $10.36
Real-time Price: $9.33 info
Change: -$1.03 (-10%) info
Market Cap: $2.007B info
NMZ
Mar 06, 2026, 9:43 PM EST
Filing Type: 425
Importance Score:
7
Price at Filing: $10.58
Real-time Price: $9.33 info
Change: -$1.25 (-12%) info
Market Cap: $2.007B info
NMZ
Feb 27, 2026, 4:08 PM EST
Filing Type: 425
Importance Score:
7
Price at Filing: $10.65
Real-time Price: $9.33 info
Change: -$1.32 (-12%) info
Market Cap: $2.007B info
NMZ
Feb 04, 2026, 6:01 AM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.51
Real-time Price: $9.33 info
Change: -$1.18 (-11%) info
Market Cap: $2.007B info
NMZ
Feb 04, 2026, 6:01 AM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.51
Real-time Price: $9.33 info
Change: -$1.18 (-11%) info
Market Cap: $2.007B info
NMZ
Feb 04, 2026, 6:00 AM EST
Filing Type: 425
Importance Score:
7
Price at Filing: $10.51
Real-time Price: $9.33 info
Change: -$1.18 (-11%) info
Market Cap: $2.007B info
NMZ
Jan 30, 2026, 9:36 PM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.43
Real-time Price: $9.33 info
Change: -$1.10 (-11%) info
Market Cap: $2.007B info
NMZ
Jan 30, 2026, 9:35 PM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.43
Real-time Price: $9.33 info
Change: -$1.10 (-11%) info
Market Cap: $2.007B info
NMZ
Jan 30, 2026, 9:34 PM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.43
Real-time Price: $9.33 info
Change: -$1.10 (-11%) info
Market Cap: $2.007B info
NMZ
Jan 23, 2026, 1:39 PM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.30
Real-time Price: $9.33 info
Change: -$0.965 (-9%) info
Market Cap: $2.007B info
NMZ
Jan 23, 2026, 1:29 PM EST
Filing Type: 425
Importance Score:
8
Price at Filing: $10.29
Real-time Price: $9.33 info
Change: -$0.960 (-9%) info
Market Cap: $2.007B info
NMZ
Jan 23, 2026, 1:20 PM EST
Filing Type: 425
Importance Score:
7
Price at Filing: $10.29
Real-time Price: $9.33 info
Change: -$0.960 (-9%) info
Market Cap: $2.007B info
NMZ
Jan 16, 2026, 4:34 PM EST
Filing Type: 425
Importance Score:
7
Price at Filing: $10.41
Real-time Price: $9.33 info
Change: -$1.08 (-10%) info
Market Cap: $2.007B info
Research tools: Filing Impact Index Dilution Tracker Split Calendar Open Datasets