So what's a stop hunter and what's all this stuff about picking off stop orders? A stop hunter is a market player that attempts to trigger the stop orders of other traders for their own benefit. They generally have the capability to move the market by a small degree for a short period. The stop hunter may be a FOREX broker's dealing desk which is trading in competition with its customers or it may simply be a large player in the market; a bank, a hedge fund or whatever.
Stop hunters operate best in an environment where most traders believe that the market is about to move in a certain direction. As traders take positions, the inexperienced ones (like me in the trade above) will place their stops at obvious places in order to cut losses if the price moves in the other direction. The stop hunters know where the amateurs are probably placing these stops, so they try to move the market enough to trigger them. This may allow a stop hunter to enter a trade at a good price before the market begins its move in the direction that everyone expects.
For example in my short trade above, there were a lot of indications that the market was headed down. Stop hunters knew that a lot of traders had taken short positions, and had probably positioned their buy-stops up at the 0.7570 area. So why should these savvy stop hunters enter a short position at 0.7530 when so many willing amateurs were willing to buy from them at 0.7570? So they proceeded to push the price up to 0.7570, and when my buy-stop order was triggered up there, guess who I was buying from? Exactly...the stop hunters who were selling to me at a great price (for them). Now I was out of the market, and they had taken over my short position at a price 40 pips above where I entered it. I had a 40 pip loss, while they entered at a price that was 40 pips better than they otherwise could have. Then, when the market headed down as we all expected it would, the stop hunters were laughing all the way to the bank while I was sitting on the sidelines pulling out what little hair I have left!
Note that a situation in which everyone expected the market to move up would work in just the opposite fashion. The amateurs would have their sell-stops at some obvious point below the market, and the stop hunters would push the market down in order to trigger those sell-stop orders. Then the amateurs would be selling out of their long positions in a panic while the stop hunters were buying from them at great prices in expectation of the coming move north.
The type of stop hunting that I've just described is used in situations where most market participants expect the price to move in a certain direction. In this situation, both the savvy stop hunters and the amateurs have the same market opinion; they are not battling each other in a contest of bulls vs. bears. The stop hunters are just trying to take over the positions of the amateurs at a good price.
There is another situation in which stop hunters try to move the market toward a group of stops in the hope that triggering the stops will push the market further in the same direction, thus triggering even more stops and so forth in a snowball effect. This is how some short term panics and rallies are created. In this case, the stop hunters have taken positions in the opposite direction from the amateurs, and are simply trying to trigger the stops to get the amateurs to panic and keep the ball rolling in that direction. My guess is that this tactic is more prevalent in less liquid markets like stocks and futures as opposed to FOREX.
