Yes, corporate raider billionaire Carl Icahn is a Jew.
Wikipedia says, "Icahn was raised in Far Rockaway, Queens, New York City, where he attended Far Rockaway High School. His family was Jewish in name, but his father was a 'dogmatic atheist'. His father was a frustrated opera singer who settled on being a cantor, before becoming a substitute teacher. His mother also worked as a schoolteacher. He graduated from Princeton University with a Bachelor of Arts degree in philosophy in 1957 and then joined New York University School of Medicine, but he dropped out after two years to join the army."
Icahn's net worth (3/2013) is $20 billion. He tweeted on August 13, 2013 that he had taken a stake in Apple stock and the buying that ensued sent the stock up over 5% within a day.