Simpson Thacher & Bartlett Simpson Thacher and Gunderson lead Yahoo! purchase of Tumblr By Joshua Freedman 21 May 2013 12:00 17 December 2015 13:21 Sign in or register to continue reading. It's FREE Sign in Email Password Keep me logged in Forgot your password? Not registered? It's FREE! Register now Register with The Lawyer Name Email Cancel reply Threaded commenting powered by interconnect/it code.