And now there are four. Five IPOs were scheduled to go public tonight, but we are learning that aluminum manufacturer Aleris has postponed the pricing of its IPO, though the S-1 has not been withdrawn. (this is an update from earlier version of this post stating five IPOs were pricing)
Aleris was seeking to raise 31.3 million shares at $15-$17. No word given on why the pricing was postponed, though week demand is usually the culprit.
Of the four other companies going public, the two getting the most "buzz" seem to be two oilfield products stocks: