The tycoon saw half his wealth vanish in just six months, as falling oil prices crushed the value of his company, Continental Resources, Inc, bringing his net worth down from $18.5 billion in June of last year to $9.3 billion in early January, according to Wealth-X, a wealth tracking company. Hamm has also been going through a very public divorce from his ex-wife, Sue Ann Arnall, which made headlines after a judge ordered him to cough up nearly $1 billion.