High-speed trading firm Virtu Financial Inc, which has been pursuing an initial public offering, has received a letter of inquiry from the New York attorney general amid a wider probe of the industry, a person familiar with the matter said on Friday. News of the request by the office of New York Attorney General Eric Schneiderman came amid heightened attention to high-frequency trading following the publication of author Michael Lewis' book "Flash Boys: A Wall Street Revolt" last month. Schneiderman's office had earlier sent subpoenas to more than half a dozen high-speed trading firms including Tower Research Capital LLC, Chopper Trading LLC and Jump Trading LLC, a person familiar with the matter previously told Reuters. Federal agencies including the Justice Department, Securities and Exchange Commission and Commodity Futures Trading Commission have also said they had active probes into high-speed and automated trading. Virtu's IPO, which was expected in April, was seeking
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