I have been looking forward to this IPO, and I find it unfortunate to read that Virtu Said to Delay IPO Amid Furor Spurred by Michael Lewis Book

In summary:

Virtu Financial Inc., the high-frequency trader that announced plans last month to sell shares, will start marketing the offering weeks later than bankers anticipated, two people with knowledge of the matter said.

Virtu won’t start marketing the initial public offering until after April 20, a process its bankers had expected to begin this week, according to the people, who asked not to be named because the decision is private.

In its IPO filing released in March, Virtu said U.S. derivatives regulators are looking into its trading practices.

With that said, they do have an astonishing trading record:

From the S-1: "The chart below illustrates our daily Adjusted Net Trading Income from January 1, 2009 through December 31, 2013. As a result of our real-time risk management strategy and technology, we had only one losing trading day during the period depicted, a total of 1,238 trading days. "

The high-frequency trading firm Virtu Financial, which had expected to go public this month, has decided to postpone those plans indefinitely. According to a NYT Dealbook Article

IPO priced @ $19, opened @ $23

Virtu Financial's IPO prices at top of the range - MarketWatch

Mike