HFT firms also MAKE MONEY BY indulging in momentum ignition. The firm might aim to cause a spike in the price of a stock by using a series of trades with the motive of attracting other algorithm traders to also trade that stock. The instigator of the whole process knows that after the somewhat “artificially created” rapid price movement, the price reverts to normal and thus the trader profits by taking a position early on and eventually trading out before it fizzles out. (Related Reading: How The Retail Investor Profits From High Frequency Trading)