Hi Warlord,
You always lose the entire spread - that's the difference between the bid and the offer price. Think of it as the commission for entering the trade, and then you win it back when / if it goes in the right direction. For example, EUR/CHF was trading sideways yesterday evening and I wanted to take a long position, but it had already gone to weekend spreads. It was 10623 sell and 10628 to buy so would have cost an initial £10 to go £2 a point.
To answer your question, NO!! A very good sales weekend will not feed into the stock price straight away because that information is not in the public domain yet. If sales are consistently better than expected it will be released as an earnings upgrade via trading update on the Regulatory News Service (RNS). Often, analysts will have an idea before the update, and the price starts to re-rate early. You can get ahead of the crowd if you've made real-world observations but also bear in mind that is a small sample size. Good luck
Vacillatorix
