Globe and Mail
Groupon Shares Touch New Low as IPO Lockup Expires
Wall Street Journal
While attention has been focused on Facebook Inc.'s stock swoon since its IPO two weeks ago, shares of Groupon, Zynga Inc., Pandora Media Inc. and other high-profile tech companies also are trading well off the levels from their stock debuts last year.
Groupon's Fall Trips Circuit Breaker; 'Short' Sales Restricted
Groupon shares fall as lock-up expires
GroupOn Dives 10% After Lock Up Expires