Pioneer Municipal High Income Opportunities Fund
MIO
MIO was delisted on the 22nd of August, 2025.
31 hedge funds and large institutions have $108M invested in Pioneer Municipal High Income Opportunities Fund in 2025 Q2 according to their latest regulatory filings, with 9 funds opening new positions, 11 increasing their positions, 9 reducing their positions, and 11 closing their positions.
22% more repeat investments, than reductions
Existing positions increased: 11 | Existing positions reduced: 9
0.33% less ownership
Funds ownership: 54.76% → 54.43% (-0.33%)
1% less capital invested
Capital invested by funds: $109M → $108M (-$883K)
9% less funds holding
Funds holding: 34 → 31 (-3)
18% less first-time investments, than exits
New positions opened: 9 | Existing positions closed: 11
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AC
Almitas Capital
Santa Monica,
California
|
+$6.75M |
| 2 |
KIM
Karpus Investment Management
Pittsford,
New York
|
+$5.82M |
| 3 |
HWAM
Hennion & Walsh Asset Management
Parsippany,
New Jersey
|
+$1.4M |
| 4 |
BI
Bulldog Investors
Saddle Brook,
New Jersey
|
+$941K |
| 5 |
UBS Group
Zurich,
Switzerland
|
+$767K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
RCM
Rivernorth Capital Management
West Palm Beach,
Florida
|
-$9.65M |
| 2 |
Pathstone Holdings
Englewood,
New Jersey
|
-$4.75M |
| 3 |
Morgan Stanley
New York
|
-$1.26M |
| 4 |
Verition Fund Management
Greenwich,
Connecticut
|
-$888K |
| 5 |
TJHA
Thomas J. Herzfeld Advisors
Miami Beach,
Florida
|
-$620K |
MIO Hedge Fund Activity: Q2 2025 in Review
31 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in Pioneer Municipal High Income Opportunities Fund (MIO) for Q2 2025, worth a combined $108M — down 0.81% from $109M a quarter earlier.
Sellers outnumbered buyers: 11 funds closed out of MIO and 9 opened new positions — a net loss of 2 holders — while 9 trimmed existing stakes and 11 added.
The largest buyer was Almitas Capital, adding an estimated $6.75M. The largest seller was Rivernorth Capital Management, cutting an estimated $9.65M.
- 31 institutional investors held Pioneer Municipal High Income Opportunities Fund (MIO) as of Q2 2025, down from 34 in Q1 2025.
- Funds reported $108M of Pioneer Municipal High Income Opportunities Fund stock for Q2 2025, down 0.81% quarter-over-quarter.
- 9 funds opened new Pioneer Municipal High Income Opportunities Fund positions in Q2 2025 and 11 closed out, a net change of -2 holders.
- The largest Pioneer Municipal High Income Opportunities Fund buyer in Q2 2025 was Almitas Capital, an estimated $6.75M added.
- The largest Pioneer Municipal High Income Opportunities Fund seller in Q2 2025 was Rivernorth Capital Management, an estimated $9.65M sold.
Based on aggregated 13F filings for Q2 2025.