If you like data driven investing and are willing to do the work, Portfolo123 provides all the information you need to construct and trade investment strategies. I've been a client for about 10 years and, for fundamental investing, I haven't found any site that comes close. You can write your own formulas to interpret the data, weight stocks in your portfolio, use your own buy and sell rules, trade weekly, monthly, or however often you think appropriate. You can test your strategies on data going back many years, and they provide articles and a forum for exchange of information to help you learn about factor investing and how to use their site. I wouldn't go anywhere else to manage my money.
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Portfolio123 is the best web-based resource for investors. It allows you to discover exciting new stock/ETF ideas, create investment strategies using ranking and screening, backtest them with realistic simulations, and implement them in real-time with advanced trading tools -- including seamless and commission-free trading across multiple accounts.