GFT UK. Is it a good idea to run losses when spread trading? David Morrison, Market Strategist at GFT UK comments. Not running losses is one of the golden rules of trading. When you enter a trade ideally you would have a firm idea of what you're hoping to achieve before you enter a trade. We can't make money all the time, we all have losing trades. Your trading plan should include a definite stop level before you even enter the trade.