Allen Global Partners LP had its best year since 2010, returning 7.01% net fees, and Global Allen Partners Offshore had its best year since 2009, with 7.38% net returns, according to a letter to investors reviewed by ValueWalk. “The Fund’s performance in 2013 was attributable to a broad range of investments across the U.S., U.K., and Europe, with the contribution from equity and credit investments relatively balanced,” the fund wrote in its fourth quarter investor letter. More signs that shareholder activism is going mainstream One of the recurring themes among hedge fund year-end investor letters has been the growing acceptance…