Most companies like ETX Capital, CMC, City Index, Capital Spreads and Worldspreads allow you to trail your stops YOURSELF. You can't tell them to move your stop loss once the price has moved X, Y, Z in your favour. IG Index has recently started offering automated trailing stops on currency bets, plus a range of global indices and commodities.
The problem with IG is that as they say "Trailing Stops can be added when placing a trade, or attached to open positions at a later stage. Please note they are not 'Guaranteed': like standard Stops they may be subject to 'slippage' in illiquid or fast-moving markets". With Worldspreads and Capital Spreads, they don't suffer this "slippage", whereas in a previous life I found IG seemed to build slippage into any stop whatever the volatility.
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