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David Einhorn takes stake in HFT-antidote IEX

David Einhorn
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Count David Einhorn on team Michael Lewis.

"Michael Lewis's new book 'Flash Boys,' like all his books, is a fun read and is based on a true story. It brings attention to some areas of the market that can improve further, and a few areas of possible abuse," Greenlight Capital, which Einhorn heads, said in an investor letter Tuesday.

Read MoreThe fight that stopped trading on the NYSE

"There are many legitimate and even beneficial aspects to computerized trading, including market making and statistical arbitrage, yet there are also some areas that are ripe for reform. Most glaring is the latency arbitrage that is used to identify the presence of large institutional orders for the sole purposed of legally front-running them."