Pioneer Municipal High Income Opportunities Fund
MIO
MIO was delisted on the 22nd of August, 2025.
25 hedge funds and large institutions have $64.8M invested in Pioneer Municipal High Income Opportunities Fund in 2023 Q1 according to their latest regulatory filings, with 3 funds opening new positions, 12 increasing their positions, 7 reducing their positions, and 4 closing their positions.
71% more repeat investments, than reductions
Existing positions increased: 12 | Existing positions reduced: 7
7% more capital invested
Capital invested by funds: $60.4M → $64.8M (+$4.38M)
1.54% more ownership
Funds ownership: 33.58% → 35.12% (+1.5%)
4% less funds holding
Funds holding: 26 → 25 (-1)
25% less first-time investments, than exits
New positions opened: 3 | Existing positions closed: 4
100% less funds holding in top 10
Funds holding in top 10: 1 → 0 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Morgan Stanley
New York
|
+$1.62M |
| 2 |
WP
Woodline Partners
San Francisco,
California
|
+$1.32M |
| 3 |
SCM
Saba Capital Management
New York
|
+$1.23M |
| 4 |
SIA
Sit Investment Associates
Minneapolis,
Minnesota
|
+$367K |
| 5 |
Rockefeller Capital Management
New York
|
+$222K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
MIG
Mariner Investment Group
Harrison,
New York
|
-$885K |
| 2 |
OFG
OTA Financial Group
Purchase,
New York
|
-$492K |
| 3 |
COLIM
City of London Investment Management
London,
United Kingdom
|
-$428K |
| 4 |
Bank of America
Charlotte,
North Carolina
|
-$213K |
| 5 |
UBS Group
Zurich,
Switzerland
|
-$189K |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
MIG
26
Mariner Investment Group
Harrison,
New York
| – | -$885K | -83,134 | Closed |
|
|
OFG
27
OTA Financial Group
Purchase,
New York
| – | -$492K | -46,222 | Closed |
|
|
28
Bank of America
Charlotte,
North Carolina
| – | -$213K | -20,000 | Closed |
|
|
IA
29
IFP Advisors
Tampa,
Florida
| – | -$9K | -400 | Closed |
|
MIO Hedge Fund Activity: Q1 2023 in Review
25 of the 6,276 institutional investors tracked by Wall St. Rank reported a position in Pioneer Municipal High Income Opportunities Fund (MIO) for Q1 2023, worth a combined $64.8M — up 7.2% from $60.4M a quarter earlier.
Sellers outnumbered buyers: 4 funds closed out of MIO and 3 opened new positions — a net loss of 1 holder — while 7 trimmed existing stakes and 12 added.
The largest buyer was Morgan Stanley, adding an estimated $1.62M. The largest seller was Mariner Investment Group, exiting entirely with an estimated $885K sold.
- 25 institutional investors held Pioneer Municipal High Income Opportunities Fund (MIO) as of Q1 2023, down from 26 in Q4 2022.
- Funds reported $64.8M of Pioneer Municipal High Income Opportunities Fund stock for Q1 2023, up 7.2% quarter-over-quarter.
- 3 funds opened new Pioneer Municipal High Income Opportunities Fund positions in Q1 2023 and 4 closed out, a net change of -1 holder.
- The largest Pioneer Municipal High Income Opportunities Fund buyer in Q1 2023 was Morgan Stanley, an estimated $1.62M added.
- The largest Pioneer Municipal High Income Opportunities Fund seller in Q1 2023 was Mariner Investment Group, an estimated $885K sold.
Based on aggregated 13F filings for Q1 2023.