Interview With A High-Frequency Trader | Zero Hedge:
"GARRETT: Trending movements are when an HFT deliberately moves a stock price up or down for its own benefit. For example, a computer can submit an overwhelming number of sell orders, knock the price of a stock down a few percentage points, then buy the stock back cheaply."
Some HFTs try to read and process the news quicker than everyone else. There are algorithms designed to read newspaper headlines, search for key words and execute trades based on what they read, all in seconds or less. I wouldn’t say this is particularly nefarious, because the HFTs in this case are just doing what humans do – trading the news – but faster.
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