Offerings // NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND

NMZ offering history

Every offering-related filing in NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND’s recent SEC record — registrations (announced capacity) kept separate from pricing documents (executed sales). Reviewed 659 filings back to Oct 17, 2003.

Last executed offering

Oct 23, 2026

424B5 — priced deal (shares or notes)

Last registration (announced)

None found

in filings back to Oct 17, 2003

Executed, last 12 months

424B pricings + 8-K 3.02 sales

Registered, last 12 months

S-1/S-3/F-series registrations

Date	Filing		What it means
Oct 23, 2026	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Oct 2, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Apr 24, 2026	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 18, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 17, 2025	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
May 9, 2025	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 31, 2024	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 20, 2024	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Apr 4, 2024	424B2 →	EXECUTED	Prospectus supplement priced — shares or notes (large filers: often a bond deal)
Jan 2, 2024	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 24, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Oct 13, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jul 14, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
May 31, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Apr 12, 2023	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Sep 30, 2022	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Dec 17, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Nov 4, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Jun 1, 2021	424B3 →	UPDATE	Prospectus update — often a resale registration, not necessarily new capital
Mar 8, 2021	424B5 →	EXECUTED	Shelf takedown priced — shares or notes (small-caps: usually shares; open the filing to confirm)
Feb 28, 2020	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 18, 2017	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Oct 6, 2016	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Sep 13, 2016	AW →	WITHDRAWN	Registration withdrawn
Sep 12, 2016	AW →	WITHDRAWN	Registration withdrawn
Apr 19, 2013	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Mar 6, 2013	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Feb 28, 2013	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
May 25, 2012	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Jan 29, 2010	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Apr 1, 2009	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin
Feb 26, 2009	AW →	WITHDRAWN	Registration withdrawn
Feb 17, 2009	AW →	WITHDRAWN	Registration withdrawn
Sep 21, 2007	EFFECT →	EFFECTIVE	SEC declared a registration effective — selling can begin

NMZ offering-related filings from SEC EDGAR, newest first (capped at 40). Each links to the original document.

Two honest limits. (1) A 424B takedown can price shares or notes — EDGAR’s metadata doesn’t say which, so open the document: large investment-grade filers use these mostly for bond deals (no dilution), small-caps mostly for shares. (2) At-the-market (ATM) programs sell shares gradually and individual sales are not separately filed — the visible footprint is the enabling shelf and its 424B5; actual ATM share counts surface later in the 10-Q/10-K share count. Educational information from public filings, not investment advice.

Is a shelf active now? →Do they need money? →Red flags →Full NMZ workspace →

NMZ offering FAQ

When did NMZ last execute an offering?

Per SEC filings, NUVEEN MUNICIPAL HIGH INCOME OPPORTUNITY FUND's most recent priced offering document is a 424B5 filed 2026-10-23. Note a 424B takedown can price shares or notes (debt) — the linked document says which.

When did NMZ last announce or register an offering?

No offering registration (S-1/S-3/F-1/F-3) appears in the filings reviewed back to 2003-10-17.

Does an offering always mean dilution?

Registered direct offerings and shelf takedowns issue new shares and dilute existing holders. Resale registrations (424B3/B7) let existing holders sell and do not create new shares. Secondary sales by insiders also do not dilute. Each row here is labeled with what it is.

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