Pioneer Municipal High Income Opportunities Fund
MIO
MIO was delisted on the 22nd of August, 2025.
33 hedge funds and large institutions have $86.8M invested in Pioneer Municipal High Income Opportunities Fund in 2023 Q4 according to their latest regulatory filings, with 13 funds opening new positions, 15 increasing their positions, 2 reducing their positions, and 8 closing their positions.
650% more repeat investments, than reductions
Existing positions increased: 15 | Existing positions reduced: 2
63% more first-time investments, than exits
New positions opened: 13 | Existing positions closed: 8
28% more capital invested
Capital invested by funds: $67.8M → $86.8M (+$19M)
14% more funds holding
Funds holding: 29 → 33 (+4)
6.59% more ownership
Funds ownership: 42.02% → 48.61% (+6.6%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SIA
Sit Investment Associates
Minneapolis,
Minnesota
|
+$6.95M |
| 2 |
Morgan Stanley
New York
|
+$4.06M |
| 3 |
SCM
Saba Capital Management
New York
|
+$2.59M |
| 4 |
AC
Almitas Capital
Santa Monica,
California
|
+$1.21M |
| 5 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$356K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AW
Atlas Wealth
Cincinnati,
Ohio
|
-$8.53M |
| 2 |
WP
Woodline Partners
San Francisco,
California
|
-$1.91M |
| 3 |
MC
Moors & Cabot
Boston,
Massachusetts
|
-$597K |
| 4 |
Rockefeller Capital Management
New York
|
-$298K |
| 5 |
SPP
Single Point Partners
Boston,
Massachusetts
|
-$98K |
MIO Hedge Fund Activity: Q4 2023 in Review
33 of the 6,860 institutional investors tracked by Wall St. Rank reported a position in Pioneer Municipal High Income Opportunities Fund (MIO) for Q4 2023, worth a combined $86.8M — up 28% from $67.8M a quarter earlier.
Buyers outnumbered sellers: 13 funds opened new MIO positions and 8 closed out — a net gain of 5 holders — while 15 added to existing stakes and 2 trimmed.
The largest buyer was Sit Investment Associates, adding an estimated $6.95M. The largest seller was Atlas Wealth, exiting entirely with an estimated $8.53M sold.
- 33 institutional investors held Pioneer Municipal High Income Opportunities Fund (MIO) as of Q4 2023, up from 29 in Q3 2023.
- Funds reported $86.8M of Pioneer Municipal High Income Opportunities Fund stock for Q4 2023, up 28% quarter-over-quarter.
- 13 funds opened new Pioneer Municipal High Income Opportunities Fund positions in Q4 2023 and 8 closed out, a net change of +5 holders.
- The largest Pioneer Municipal High Income Opportunities Fund buyer in Q4 2023 was Sit Investment Associates, an estimated $6.95M added.
- The largest Pioneer Municipal High Income Opportunities Fund seller in Q4 2023 was Atlas Wealth, an estimated $8.53M sold.
Based on aggregated 13F filings for Q4 2023.