Yahoo! Finance (https://finance.yahoo.com), owned by Verizon Media, has been a go-to source of market news for years, making it one of the best stock research sites. It provides financial news, data and commentary including stock quotes, press releases, financial reports, and original content. It also offers some online tools for personal finance management. Besides that, it provides investment tools, such as Watchlists, My Portfolio and Screeners. Basically, Yahoo! Finance provides free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help investors manage their finances. This site is a great place for new or experienced investors to research on their investments.