MIO

Pioneer Municipal High Income Opportunities Fund
MIO

Overview Fund Activity
Delisted

MIO was delisted on the 22nd of August, 2025.

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23 hedge funds and large institutions have $71.4M invested in Pioneer Municipal High Income Opportunities Fund in 2021 Q4 according to their latest regulatory filings, with 17 funds opening new positions, 4 increasing their positions, 1 reducing their positions, and 1 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
23
Holders Change
+16
Holders Change %
+228.57%
% of All Funds
0.36%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
17
Increased
4
Reduced
1
Closed
1
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
SIA
Sit Investment Associates
Minnesota
+$13.8M
2
COLIM
City of London Investment Management
United Kingdom
+$10.5M
3
RCM
Rivernorth Capital Management
Florida
+$8.49M
4
Morgan Stanley
Morgan Stanley
New York
+$6.02M
5
1CP
1607 Capital Partners
Virginia
+$3.46M

Top Sellers

1
Wells Fargo
Wells Fargo
California
-$1.25M
2
Millennium Management
Millennium Management
New York
-$642K
Name Holding Trade Value Shares
Change 		Shares
Change %
RCM
1
Rivernorth Capital Management
Florida
$14.9M +$8.49M +462,336 +132%
SIA
2
Sit Investment Associates
Minnesota
$13.8M +$13.8M +753,047 New
Morgan Stanley
3
Morgan Stanley
New York
$12.4M +$6.02M +327,949 +95%
COLIM
4
City of London Investment Management
United Kingdom
$10.5M +$10.5M +571,995 New
Wells Fargo
5
Wells Fargo
California
$3.48M -$1.25M -67,850 -26%
1CP
6
1607 Capital Partners
Virginia
$3.46M +$3.46M +188,186 New
KIM
7
Karpus Investment Management
New York
$2.65M +$2.65M +144,276 New
PPA
8
Parametric Portfolio Associates
Washington
$1.95M +$1.95M +106,176 New
RCM
9
Robinson Capital Management
Michigan
$1.71M +$1.71M +93,000 New
VanEck Associates
10
VanEck Associates
New York
$1.69M +$207K +11,241 +14%
MIG
11
Mariner Investment Group
New York
$1.01M +$1.01M +55,065 New
UBS Group
12
UBS Group
Switzerland
$962K +$11.3K +615 +1%
WAM
13
Wolverine Asset Management
Illinois
$934K +$934K +50,892 New
TJHA
14
Thomas J. Herzfeld Advisors
Florida
$538K +$538K +29,265 New
Susquehanna International Group
15
Susquehanna International Group
Pennsylvania
$444K +$444K +24,187 New
Nomura Holdings
16
Nomura Holdings
Japan
$328K +$328K +17,900 New
First Trust Advisors
17
First Trust Advisors
Illinois
$282K +$282K +15,364 New
6M
18
6 Meridian
Kansas
$201K +$201K +10,964 New
Amundi
19
Amundi
France
$92K +$92K +5,000 New
S
20
SignatureFD
Georgia
$55K – – –
TRCT
21
Tower Research Capital (TRC)
New York
$8K +$8K +425 New
Bessemer Group
22
Bessemer Group
New Jersey
$3K +$3K +178 New
Royal Bank of Canada
23
Royal Bank of Canada
Ontario, Canada
$2K +$2K +83 New
Millennium Management
24
Millennium Management
New York
– -$642K -31,502 Closed