Mr. Kalisman and OTK reacted to the Yucaipa deal by immediately filing a derivative lawsuit pending in Delaware Chancery Court that seeks to block the deal.

WSJ: The Fight for Hip Hotel Firm

Two weeks ago, Pfizer Inc. was hit with a stockholder derivative lawsuit in a Delaware court, arising out of its September 2009 settlement of federal allegations that it improperly promoted several of its drugs.

FORBES: Courts Should Firmly Reject Shareholder Activists' Breach of Fiduciary Duty Derivative Suits

Los Angeles (CNN) -- The California State Teachers' Retirement System has filed a derivative action lawsuit against current and former Wal-Mart executives and board members for the firm's alleged bribery in Mexico and a subsequent corporate coverup, the system said Friday.

CNN: STORY HIGHLIGHTS

UBS, filed a lawsuit against a rival, Deutsche Bank, for refusing to pay out on a credit derivative on Armstrong World Industries, a maker of building materials based in Pennsylvania.

ECONOMIST: Credit derivatives