Market Insider

After-hours buzz: Xerox, Valeant, Dycom & more

Spencer Platt | Getty Images

Check out the companies making headlines after the bell Monday:

Xerox popped after activist investor Carl Icahn reported a 7.13 percent stake in the U.S. printer company. He said that the stock was undervalued, and he plans to "have talks with management," per The Wall Street Journal.

Valeant inched higher after Bill Ackman boosted his stake in the company to 9.9 percent from 5.68 percent. Ackman's total holdings are currently at 34 million shares, per a public filing.

Shares of Brocade Communications plunged after reporting results of its fiscal-fourth quarter. Despite beating expectations on earnings, the company provided weak guidance for the upcoming year.