//model object

public class Holding

{

    public string StockName { get; set; }

    public double PPS { get; set; }

    public bool IsCurrentlyHeld { get; set; }

    public double InitialStopPrice {

        get { return this.PPS * 0.98; }

    }

    public double CurrentStopPrice { get; set; }

    public double CurrentPrice { get; set; }

} 

​

//controller method

public class StopLoss

{

    public void manageTailingStop(Holding holding)

    {                                       

        while (holding.IsCurrentlyHeld)

        {

            double change = holding.PPS - holding.CurrentPrice;

            if (change < 0) //if PPS has gone down since buying

            { 

                //see below

            } else if (change > 0) //if PPS has gone up since buying

            {

                //determine the highest stop loss sell "increment" (i.e. 5%, 10%, 15% ROI, etc.) still below holding.CurrentPrice to set stop at

                //and if it's different from the holding.CurrentStopPrice, cancel the pending Stop Loss Sell order so RH doesn't freak out

                //place stop loss sell order && update holding.CurrentStopPrice

            } //else do nothing as price hasn't changed at all and intial stop is still relevant

        }

    }

}