There are many free and fee-based investment research web sites that cover a wide variety of investment topics and types of securities. Here is a very selective list of mostly-free sites:
Investment industry associations can be excellent information sources as they often publish annual reports and statistical reports.
The following sources listed below are useful if you only need current information:
Start by reviewing the Mutual Fund company's website. Recent performance data may be posted online for current and potential investors.
Stock exchanges often publish statistical data on market activity. Some reports may be subscription-based, while others are freely available on their public web site. Here are links to a few examples: