FilingIndex
AGSS10-KAMSS10-QPETVW10-KFMCQF11-KCTGO8-KBLTHS-1/AAURADEF 14AQLEP-UN8-KTOVXDEF 14AMLM8-KCURB424B5GL-PD8-KEXYNWS-1DLR-PJ8-KDFNSW8-KOTH8-K/APSKY8-KMODD10-KCTVA8-KSEQCS-1PPIH8-KOPRTDEFA14AAAVXF6-KMNRO11-KOPRTDEF 14AAIB8-KSWMR8-KRMCFDEF 14AALH8-KCVKD8-KAGSS10-KAMSS10-QPETVW10-KFMCQF11-KCTGO8-KBLTHS-1/AAURADEF 14AQLEP-UN8-KTOVXDEF 14AMLM8-KCURB424B5GL-PD8-KEXYNWS-1DLR-PJ8-KDFNSW8-KOTH8-K/APSKY8-KMODD10-KCTVA8-KSEQCS-1PPIH8-KOPRTDEFA14AAAVXF6-KMNRO11-KOPRTDEF 14AAIB8-KSWMR8-KRMCFDEF 14AALH8-KCVKD8-K
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NMZNYSE

NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

— · MA · CIK 1266585

Invests in municipal securities for high current income exempt from federal tax and total return

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$1.22B
Market cap
$10.53
Last close
+0.4%
1D
+1.9%
5D
507K
Volume
Price · last 39 sessions+4.8%
May 4L $10.01 · H $10.53Jun 29
77
Total filings
Mar 19, 2026
Last filing
—
Fiscal year end
All425 · 30DEF 14A · 22DEFA14A · 108-K · 5SC 13G · 4SC 13D · 4424B5 · 2SC 13D/A · 1
SC 13D/ASC 13D/AApr 29, 2026425FORM 425Mar 19, 2026425FORM 425Mar 19, 2026425FILING UNDER SECURITIES ACT RULE 425Mar 9, 2026425FILING UNDER SECURITIES ACT RULE 425Mar 9, 2026425FILING UNDER SECURITIES ACT RULE 425Mar 9, 2026425FILING UNDER SECURITIES ACT RULE 425Mar 9, 2026425FILING UNDER RULE 425Feb 27, 2026425FILING UNDER SECURITIES ACT RULE 425 OF CERTAIN PROSPECTUSES AND COMMUNICATIONSFeb 26, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 4, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 4, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 4, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 2, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 2, 2026425FILING UNDER SECURITIES ACT RULE 425Feb 2, 2026425FILING UNDER RULE 425Jan 23, 2026425FILING UNDER RULE 425Jan 23, 2026425FILING UNDER RULE 425Jan 23, 2026425FILING UNDER SECURITIES ACT RULE 425Jan 16, 2026425FILING UNDER SECURITIES ACT RULE 425Jan 16, 2026425FILING UNDER SECURITIES ACT RULE 425Jan 16, 2026425FILING UNDER SECURITIES ACT RULE 425Dec 29, 2025425FILING UNDER SECURITIES ACT RULE 425Dec 29, 2025425FILING UNDER SECURITIES ACT RULE 425Dec 29, 2025425FILING UNDER SECURITIES ACT RULE 425Dec 29, 2025DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 30, 2025DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 27, 20248-KReg FD DisclosureMar 6, 20248-KExecutive ChangeOct 13, 2023DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 30, 2023SC 13DSC 13DApr 12, 2023DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 28, 20228-KReg FD DisclosureFeb 25, 2022424B5NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDDec 17, 2021DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 25, 2021SC 13DSC 13DApr 28, 2021424B5NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDMar 8, 20218-KReg FD DisclosureOct 6, 2020DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 26, 2020DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 28, 2019DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 28, 2018DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 23, 20178-KCompany UpdateAug 5, 2016DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJun 24, 2016DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDJul 1, 2015425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 2May 17, 2013425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDMay 17, 2013DEF 14ANUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDApr 25, 2013SC 13DNUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 13DDec 28, 2012425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 2Dec 18, 2012425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDDec 18, 2012425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND 2Dec 14, 2012425NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUNDDec 14, 2012SC 13GSCHEDULE 13GNov 9, 2012DEF 14ADEF 14AJul 2, 2012DEFA14ADEFA14AJul 29, 2011DEF 14ADEF 14AJun 22, 2011SC 13GSC 13GJan 7, 2011SC 13DFILINGAug 5, 2010DEF 14ADEF 14AJun 18, 2010DEFA14ADEFA14AAug 19, 2009DEFA14AFORM DEFA14AJul 31, 2009DEF 14ADEF 14AJun 18, 2009SC 13GSCHEDULE 13GFeb 17, 2009SC 13GSC 13GDec 10, 2008DEFA14ADEFINITIVE ADDITIONAL MATERIALSSep 8, 2008DEFA14ADEFINITIVE PROXY STATEMENT - ADDITIONAL MATERIALSAug 1, 2008DEF 14ADEFINITIVE PROXY STATEMENTJun 30, 2008DEFA14ADEFINITIVE ADDITIONAL MATERIALSOct 15, 2007DEFA14ADEFINITIVE ADDITIONAL MATERIALSSep 5, 2007DEFA14ADEFINITIVE ADDITIONAL MATERIALSAug 29, 2007DEF 14ADEFINITIVE PROXY STATEMENTAug 22, 2007DEFA14ASOLICITING MATERIALAug 13, 2007DEFA14ASOLICITING MATERIALAug 10, 2007DEF 14ADEFINITIVE PROXY STATEMENTJun 27, 2007DEF 14ADEFINITIVE NOTICE AND PROXYJun 27, 2006DEF 14ADEFINITIVE PROXY STATEMENTJun 21, 2005DEF 14ADEFINITIVE NOTICE AND PROXYJun 30, 2004

Insider Activity

◆ Cluster Buy · 2 insiders

In the 90 days to Mar 5, 2026: 2 insiders bought $11K · 1 sold $11K.

DateInsiderActionSharesPriceValue
Mar 5, 2026Siffermann William AVice PresidentBuy100$10.48$1K
Dec 19, 2025Merrill Lynch, Pierce, Fenner & Smith Inc.TenPercentOwnerSell1,000$10.54$11K
Dec 19, 2025Merrill Lynch, Pierce, Fenner & Smith Inc.TenPercentOwnerBuy1,000$10.32$10K
Oct 10, 2025Bank Of America Corp /De/TenPercentOwnerSell6,440$10.64$69K
Oct 10, 2025Bank Of America Corp /De/TenPercentOwnerBuy6,440$10.56$68K
Oct 9, 2025Merrill Lynch, Pierce, Fenner & Smith Inc.TenPercentOwnerBuy190$10.62$2K
Oct 9, 2025Merrill Lynch, Pierce, Fenner & Smith Inc.TenPercentOwnerSell190$10.62$2K

Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.

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Comparable business profile · signals at a glance

NMCONuveen Municipal Credit Opportunities Fund$597.1M+0.7%NMINUVEEN MUNICIPAL INCOME FUND INC$134.2M-0.2%NUVNUVEEN MUNICIPAL VALUE FUND INC$1.9B+0.3%NDMONuveen Dynamic Municipal Opportunities Fund$617.8M+0.4%NADNuveen Quality Municipal Income Fund$2.8B+0.2%JPCNuveen Preferred & Income Opportunities Fund$2.9B+1.0%