Triangle Petroleum Set to Join Russell 3000® Index, Russell Global Index and Russell Microcap® Index

DENVER, CO - Triangle Petroleum Corporation (NYSE Amex: TPLM) is set to join the U.S. broad-market Russell 3000® Index, Russell Microcap® Index and the Russell Global Index when Russell Investments reconstitutes its comprehensive set of U.S. and global equity indexes on June 24, according to a preliminary list of additions posted June 10 on www.russell.com/indexes. Annual reconstitution of Russell's