Pioneer Municipal High Income Opportunities Fund (MIO) Short Interest Ratio & Short Volume $11.38 +0.04 (+0.31%) Closing price 08/22/2025Extended Trading$11.38 0.00 (0.00%) As of 08/22/2025 05:23 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Share Share Short Interest Stock AnalysisChartDividendHeadlinesInsider TradesOwnershipSEC FilingsShort InterestTrendsBuy This Stock Pioneer Municipal High Income Opportunities Fund Short Interest DataPioneer Municipal High Income Opportunities Fund (MIO) has a short interest of 17,500 shares. This marks a -8.38% decrease in short interest from the previous month. The short interest ratio (days to cover) is 0.2, indicating that it would take 0.2 days of the average trading volume of 49,526 shares to cover all short positions.Current Short Interest17,500 sharesPrevious Short Interest19,100 sharesChange Vs. Previous Month-8.38%Dollar Volume Sold Short$200.38 thousandShort Interest Ratio0.2 Days to CoverLast Record DateJuly 31, 2025Today's Trading Volume18,839 sharesAverage Trading Volume49,526 sharesToday's Volume Vs. Average38% Short Selling Pioneer Municipal High Income Opportunities Fund? Sign up to receive the latest short interest report for Pioneer Municipal High Income Opportunities Fund and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartMIO Short Interest Over TimeMIO Days to Cover Over TimeMIO Percentage of Float Shorted Over Time Pioneer Municipal High Income Opportunities Fund Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 7/31/202517,500 shares $200.38 thousand -8.4%N/A0.2 $11.45 7/15/202519,100 shares $223.28 thousand +75.2%N/A0.3 $11.69 6/30/202510,900 shares $128.95 thousand +84.8%N/A0.2 $11.83 6/15/20255,900 shares $69.89 thousand -14.5%N/A0.1 $11.85 5/31/20256,900 shares $82.11 thousand -25.8%N/A0.1 $11.90 5/15/20259,300 shares $111.32 thousand -65.4%N/A0.2 $11.97 4/30/202526,900 shares $317.96 thousand +75.8%N/A0.7 $11.82 4/15/202515,300 shares $171.97 thousand -39.3%N/A0.4 $11.24 3/31/202525,200 shares $296.73 thousand +17.8%N/A0.8 $11.78 3/15/202521,400 shares $254.66 thousand +0.5%N/A0.7 $11.90 Get the Latest News and Ratings for MIO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Pioneer Municipal High Income Opportunities Fund and its competitors with MarketBeat's FREE daily newsletter. 2/28/202521,300 shares $258.45 thousand -8.6%N/A0.7 $12.13 2/15/202523,300 shares $281.93 thousand -1.7%N/A0.7 $12.10 1/31/202523,700 shares $285.35 thousand -51.2%N/A0.7 $12.04 1/15/202548,600 shares $578.83 thousand -4.1%N/A1.3 $11.91 12/31/202450,700 shares $601.30 thousand +127.4%N/A1.4 $11.86 12/15/202422,300 shares $269.61 thousand +29.7%N/A0.6 $12.09 11/30/202417,200 shares $211.73 thousand -13.6%N/A0.6 $12.31 11/15/202419,900 shares $241.79 thousand +101.0%N/A0.7 $12.15 10/31/20249,900 shares $119.99 thousand -32.2%N/A0.3 $12.12 10/15/202414,600 shares $178.27 thousand -41.6%N/A0.5 $12.21 9/30/202425,000 shares $310 thousand -15.3%N/A0.8 $12.40 9/15/202429,500 shares $367.57 thousand +9.7%N/A1 $12.46 8/31/202426,900 shares $326.30 thousand -32.1%N/A0.8 $12.13 8/15/202439,600 shares $480.74 thousand +14.1%N/A1.1 $12.14 7/31/202434,700 shares $414.67 thousand -14.5%N/A1 $11.95 7/15/202440,600 shares $477.86 thousand -29.0%N/A1.1 $11.77 6/30/202457,200 shares $666.38 thousand +4.4%N/A1.5 $11.65 6/15/202454,800 shares $640.61 thousand -2.1%N/A1.4 $11.69 5/31/202456,000 shares $630 thousand +24.2%N/A1.5 $11.25 5/15/202445,100 shares $516.85 thousand +0.9%N/A1.1 $11.46 4/30/202444,700 shares $491.70 thousand +14.6%N/A1.1 $11.00 4/15/202439,000 shares $434.46 thousand +33.6%N/A1 $11.14 3/31/2024148,100 shares $1.68 million +1,271.3%N/A1.3 $11.31 3/15/202410,800 shares $120.10 thousand -72.2%N/A0.2 $11.12 2/29/202438,900 shares $0.00 -46.6%N/A0.7 $0.00 MIO Short Interest - Frequently Asked Questions What is Pioneer Municipal High Income Opportunities Fund's current short interest? Short interest is the volume of Pioneer Municipal High Income Opportunities Fund shares that have been sold short but have not yet been covered or closed out. As of July 31st, investors have sold 17,500 shares of MIO short. Learn More on Pioneer Municipal High Income Opportunities Fund's current short interest. Is Pioneer Municipal High Income Opportunities Fund's short interest increasing or decreasing? Pioneer Municipal High Income Opportunities Fund saw a drop in short interest during the month of July. As of July 31st, there was short interest totaling 17,500 shares, a drop of 8.4% from the previous total of 19,100 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment. Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($70.87 billion), Invesco QQQ ($30.12 billion), iShares Russell 2000 ETF ($19.85 billion), iShares 20+ Year Treasury Bond ETF ($10.34 billion), Strategy Inc ($8.98 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.61 billion), SPDR S&P Biotech ETF ($6.81 billion), Invesco S&P 500 Equal Weight ETF ($6.14 billion), Palo Alto Networks, Inc. ($5.97 billion), and Super Micro Computer, Inc. ($5.28 billion). View all of the most shorted stocks. What does it mean to sell short Pioneer Municipal High Income Opportunities Fund stock? Short selling MIO is an investing strategy that aims to generate trading profit from Pioneer Municipal High Income Opportunities Fund as its price is falling. MIO shares are trading up $0.04 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit. How does a short squeeze work against Pioneer Municipal High Income Opportunities Fund? A short squeeze for Pioneer Municipal High Income Opportunities Fund occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of MIO, which in turn drives the price of the stock up even further. How often is Pioneer Municipal High Income Opportunities Fund's short interest reported? Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including MIO, twice per month. The most recent reporting period available is July, 31 2025. More Short Interest Resources from MarketBeat Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:MIO) was last updated on 8/31/2025 by MarketBeat.com Staff From Our PartnersINVESTOR ALERT: Tiny “$3 AI Wonder Stock” on the Verge of Blasting OffRight now, we’re witnessing a monumental shift in the world.Traders Agency | SponsoredBONUS GUIDE - Ben Stein Prepares For the Next Financial CrisisWith inflation high, debt soaring, and global tensions rising, a financial storm may be brewing. Economist ...Goldco Precious Metals | SponsoredThis is my Christian duty“This land I will give to you…” — a 4,000-year-old line from Genesis may hold the key to unlocking a $150 tril...Paradigm Press | SponsoredEveryone’s watching Nvidia right now. 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