Based on his latest 13F filing with the SEC, Carl Icahn put in a solid Q1 as the value of his holdings rises from $12.9B at the end of Q4 to $16.9B as of March. New additions include loudly trumpeted stakes in Herbalife (NYSE:HLF) and Dell (DELL-OLD) as well as a 3.7M share stake in Nuance Communications (NASDAQ:NUAN). Icahn's Netflix (NASDAQ:NFLX) stake remains on the books and is now worth more than $1B.