News & Events Apr 21, 2009 Simpson Thacher Represents Blackstone in Acquisition of Stiefel Laboratories by GlaxoSmithKline in Transaction Valued at up to $3.6 Billion Apr 21, 2009 Simpson Thacher Receives Top Tier Rankings in Chambers Global 2009 Apr 21, 2009 Simpson Thacher Represents UBS AG in $2.5 Billion Sale of UBS Pactual to BTG Investments