Excellent site for testing stock and ETF trading strategies. P123 provides a thorough point-in-time database with a powerful and flexible engine to simulate backtests of systems. And they integrate with Interactive Brokers to automate applying those strategies to live trading.
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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.