GStock generally backtests each investment strategy on an 8-year trading data of the stock, unless the stock has a shorter trading history. In cases of a shorter trading history, GStock will proceed to backtest the stock, but under its sole discretion, may decide that the trading history is not sufficient for backtesting, or that backtesting produces too few BUY & SELL signals. Under such circumstances, GStock will mark the results as "unavailable" and will not publish the best investment strategies for that stock.