Clark has been married four times and has three children. In 2000, his daughter Kathy married Chad Hurley, co-founder of YouTube.[6] The divorce from his third wife of 15 years, Nancy Rutter, a Forbes journalist, is reported to have cost him $125 million in cash and assets in the settlement. Soon afterwards he began dating Australian model Kristy Hinze, 36 years his junior. Hinze became his fourth wife when they married in the British Virgin Islands on March 22, 2009.[7] She gave birth to a daughter in September 2011.
 
Clark is an enthusiastic yachtsman and the owner of several high-tech sailboats that he has helped to design:
 
Hyperion, 47.5m sloop-rigged sailing yacht with 59m carbon fiber mast. Recently sold.
Athena, 90m classic three-masted gaff aluminum schooner.
Hanuman,[8] 42.1m J-Class sloop.[9]