You win some, you lose some.
As oil prices continue to fall, some of America's richest oil tycoons have stayed on top and continued making money — while others have seen their fortunes cut in half.
According to Wealth-X, four of the top 10 oil billionaires have actually increased their net worth since oil prices started to decline last year.
David and Charles Koch top the list with a 7% increase in net worth since June, which Wealth-X attributes to the diversification of their company's investment portfolio. Elaine Marshall, who holds about 15% of Koch Industries, saw her net worth increase by 6%. Richard Kinder of Kinder Morgan Partners increased his net worth the most, by 23%.
The biggest loser among the top 10 by far was Continental Resources CEO Harold Hamm, currently caught in a bitter and costly divorce battle, who lost 50% of his net worth since June. Sisters Milane Frantz, Randa Williams, and Dannine Avara of the Duncan energy empire all saw their net worth decline by 11%.
Here's the full list from Wealth-X:
1. David Koch
- Net worth in June 2014: $42 billion
- Current net worth: $44.9 billion
- Change in net worth: 7%
2. Charles Koch
- Net worth in June 2014: $42 billion
- Current net worth: $44.8 billion
- Change in net worth: 7%
3. George Kaiser
- Net worth in June 2014: $13.3 billion
- Current net worth: $13.2 billion
- Change in net worth: -1%
4. Richard Kinder
- Net worth in June 2014: $9.2 billion
- Current net worth: $11.3 billion
- Change in net worth: 23%
5. Harold Hamm
- Net worth in June 2014: $18.5 billion
- Current net worth: $9.3 billion
- Change in net worth: -50%
6. Elaine Marshall
- Net worth in June 2014: $7.8 billion
- Current net worth: $8.3 billion
- Change in net worth: 6%
7. Ray Hunt
- Net worth in June 2014: $6 billion
- Current net worth: $5.6 billion
- Change in net worth: -7%
8. Milane (Duncan) Frantz
- Net worth in June 2014: $6.2 billion
- Current net worth: $5.5 billion
- Change in net worth: -11%
9. Randa (Duncan) Williams
- Net worth in June 2014: $6.2 billion
- Current net worth: $5.5 billion
- Change in net worth: -11%
10. Dannine (Duncan) Avara
- Net worth in June 2014: $6.2 billion
- Current net worth: $5.5 billion
- Change in net worth: -11%
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