Pioneer Municipal High Income Opportunities Fund

MIO • NYSE

Pioneer Municipal High Income Opportunities Fund is a publicly traded company on NYSE. As of Q3 2025, 1 institutional investors hold shares in this company, with total holdings valued at $12.1K. Advisor Group Holdings, Inc. is the largest holder with a position valued at $12.1K.

Websiteamundi.com

Overview

Overview of institutional ownership in MIO as of Q3 2025

All Institutions

Institutions: 1
Value Held: $12.1K
Shares Held: 1.1K
Avg Position: $12.1K
Median Position: $12.1K

Hedge Funds

Hedge Funds: 0
Value Held: -
Shares Held: -
Avg Position: -
Median Position: -

Biggest Investors

Institutions with the largest positions in MIO as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
A Advisor Group Holdings, Inc. Institution	-	$12.1K 0.00% of portfolio	0.00% 1.1K shares	Q1 2023 Held for 2y 8m	$71.0B
S Saba Capital Management, L.P. Hedge Fund•Multi-Strategy	Boaz Ronald Weinstein Founder	- 0.00% of portfolio	0.00% - shares	Q4 2022 Held for 2y 11m	$3.0B
ABSOLUTE INVESTMENT ADVISERS LLC Hedge Fund•Multi-Strategy	James Phillip Compson CIO	- 0.00% of portfolio	0.00% - shares	Q2 2025 Held for 5 months	$73.8M
SIT INVESTMENT ASSOCIATES INC Long Only Manager	Roger J Sit CEO	- 0.00% of portfolio	0.00% - shares	Q3 2025 Held for 2 months	$2.4B
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	- 0.00% of portfolio	0.00% - shares	Q2 2024 Held for 1y 5m	$633.08B
Kovitz Investment Group Partners, LLC RIA/Wealth	Mitchell Armin Kovitz CEO	- 0.00% of portfolio	0.00% - shares	Q2 2025 Held for 5 months	$25.6B
UBS Group AG Institution	Sergio P. Ermotti CEO	- 0.00% of portfolio	0.00% - shares	Q4 2022 Held for 2y 11m	$511.54B
AUXIER ASSET MANAGEMENT RIA/Wealth	James Jeffrey Auxier President	- 0.00% of portfolio	0.00% - shares	Q1 2025 Held for 8 months	$713.5M
K Karpus Management, Inc. Institution	-	- 0.00% of portfolio	0.00% - shares	Q2 2025 Held for 5 months	$3.1B
Almitas Capital LLC RIA/Wealth	Ronald Dean Mass Managing Partner	- 0.00% of portfolio	0.00% - shares	Q4 2023 Held for 1y 11m	$435.9M

Net Capital Flow

Institutional buying and selling activity for MIO in Q3 2025

Traded: −$75.8M
Buyers: 0
Sellers: 26
Total Bought: +-
Total Sold: −$75.8M
Avg Position: $391.5

Biggest Buyers

Institution	Net Bought	Current Position
No buyers found

Biggest Sellers

Institution	Net Sold	Current Position
S Saba Capital Management, L.P. Hedge Fund•Multi-Strategy	−$25.5M −2.2M shares	Sold Off 0 shares
Almitas Capital LLC RIA/Wealth	−$9.3M −790.8K shares	Sold Off 0 shares
RIVERNORTH CAPITAL MANAGEMENT, LLC Hedge Fund•Multi-Strategy	−$8.9M −752.5K shares	Sold Off 0 shares
MORGAN STANLEY RIA/Wealth	−$6.9M −586.9K shares	Sold Off 0 shares
K Karpus Management, Inc. Institution	−$5.9M −496.4K shares	Sold Off 0 shares
G GUGGENHEIM CAPITAL LLC Institution	−$4.8M −408.9K shares	Sold Off 0 shares
WELLS FARGO & COMPANY/MN Institution	−$4.1M −351.2K shares	Sold Off 0 shares
Hennion & Walsh Asset Management, Inc. RIA/Wealth	−$3.0M −252.2K shares	Sold Off 0 shares
Pathstone Holdings, LLC Family Office	−$1.6M −137.2K shares	Sold Off 0 shares
UBS Group AG Institution	−$1.2M −105.2K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited MIO in Q3 2025

New Positions: 5
New Value: -
Exited Positions: 30
Exited Value: $75.8M

New Positions

Institution	Position Value
SIT INVESTMENT ASSOCIATES INC Long Only Manager	- - shares
COHEN & STEERS INC Institution	- - shares
Wellspring Financial Advisors, LLC RIA/Wealth	- - shares
VAN ECK ASSOCIATES CORP ETF Provider	- - shares
R ROYAL BANK OF CANADA Institution	- - shares

Exited Positions

Institution	Previous Position
S Saba Capital Management, L.P. Hedge Fund•Multi-Strategy	$25.5M 2.2M shares
Almitas Capital LLC RIA/Wealth	$9.3M 790.8K shares
RIVERNORTH CAPITAL MANAGEMENT, LLC Hedge Fund•Multi-Strategy	$8.9M 752.5K shares
MORGAN STANLEY RIA/Wealth	$6.9M 586.9K shares
K Karpus Management, Inc. Institution	$5.9M 496.4K shares
G GUGGENHEIM CAPITAL LLC Institution	$4.8M 408.9K shares
WELLS FARGO & COMPANY/MN Institution	$4.1M 351.2K shares
Hennion & Walsh Asset Management, Inc. RIA/Wealth	$3.0M 252.2K shares
Pathstone Holdings, LLC Family Office	$1.6M 137.2K shares
UBS Group AG Institution	$1.2M 105.2K shares

Options Activity

Institutions with the largest Call and Put options positions in MIO as of Q3 2025

Call Positions: 0
Call Value: -
Put Positions: 0
Put Value: -

Call Positions

Institution	Position Value
No call positions found

Put Positions

Institution	Position Value
No put positions found

Most Committed Institutions

Institutions with MIO as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
A Advisor Group Holdings, Inc. Institution	-	0.00% $12.1K	0.00% 1.1K shares	Q1 2023 Held for 2y 8m	$71.0B
S Saba Capital Management, L.P. Hedge Fund•Multi-Strategy	Boaz Ronald Weinstein Founder	0.00% -	0.00% - shares	Q4 2022 Held for 2y 11m	$3.0B
ABSOLUTE INVESTMENT ADVISERS LLC Hedge Fund•Multi-Strategy	James Phillip Compson CIO	0.00% -	0.00% - shares	Q2 2025 Held for 5 months	$73.8M
SIT INVESTMENT ASSOCIATES INC Long Only Manager	Roger J Sit CEO	0.00% -	0.00% - shares	Q3 2025 Held for 2 months	$2.4B
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	0.00% -	0.00% - shares	Q2 2024 Held for 1y 5m	$633.08B
Kovitz Investment Group Partners, LLC RIA/Wealth	Mitchell Armin Kovitz CEO	0.00% -	0.00% - shares	Q2 2025 Held for 5 months	$25.6B
UBS Group AG Institution	Sergio P. Ermotti CEO	0.00% -	0.00% - shares	Q4 2022 Held for 2y 11m	$511.54B
AUXIER ASSET MANAGEMENT RIA/Wealth	James Jeffrey Auxier President	0.00% -	0.00% - shares	Q1 2025 Held for 8 months	$713.5M
K Karpus Management, Inc. Institution	-	0.00% -	0.00% - shares	Q2 2025 Held for 5 months	$3.1B
Almitas Capital LLC RIA/Wealth	Ronald Dean Mass Managing Partner	0.00% -	0.00% - shares	Q4 2023 Held for 1y 11m	$435.9M