Pioneer Municipal High Income Opportunities Fund
MIO
MIO was delisted on the 22nd of August, 2025.
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.
1,600% more first-time investments, than exits
New positions opened: 17 | Existing positions closed: 1
300% more repeat investments, than reductions
Existing positions increased: 4 | Existing positions reduced: 1
229% more funds holding
Funds holding: 7 → 23 (+16)
213% more capital invested
Capital invested by funds: $22.8M → $71.4M (+$48.6M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SIA
Sit Investment Associates
Minneapolis,
Minnesota
|
+$14.2M |
| 2 |
COLIM
City of London Investment Management
London,
United Kingdom
|
+$10.8M |
| 3 |
RCM
Rivernorth Capital Management
West Palm Beach,
Florida
|
+$8.73M |
| 4 |
Morgan Stanley
New York
|
+$6.19M |
| 5 |
1CP
1607 Capital Partners
Richmond,
Virginia
|
+$3.55M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wells Fargo
San Francisco,
California
|
-$1.28M |
| 2 |
Millennium Management
New York
|
-$642K |
MIO Hedge Fund Activity: Q4 2021 in Review
23 of the 6,518 institutional investors tracked by Wall St. Rank reported a position in Pioneer Municipal High Income Opportunities Fund (MIO) for Q4 2021, worth a combined $71.4M — up 213% from $22.8M a quarter earlier.
Buyers outnumbered sellers: 17 funds opened new MIO positions and 1 closed out — a net gain of 16 holders — while 4 added to existing stakes and 1 trimmed.
The largest buyer was Sit Investment Associates, opening a new position worth an estimated $14.2M. The largest seller was Wells Fargo, cutting an estimated $1.28M.
- 23 institutional investors held Pioneer Municipal High Income Opportunities Fund (MIO) as of Q4 2021, up from 7 in Q3 2021.
- Funds reported $71.4M of Pioneer Municipal High Income Opportunities Fund stock for Q4 2021, up 213% quarter-over-quarter.
- 17 funds opened new Pioneer Municipal High Income Opportunities Fund positions in Q4 2021 and 1 closed out, a net change of +16 holders.
- The largest Pioneer Municipal High Income Opportunities Fund buyer in Q4 2021 was Sit Investment Associates, an estimated $14.2M added.
- The largest Pioneer Municipal High Income Opportunities Fund seller in Q4 2021 was Wells Fargo, an estimated $1.28M sold.
Based on aggregated 13F filings for Q4 2021.