Bill Gates named world's richest man again with fortune of $86bn as Donald Trump slips 220 spots on the list to 544

Microsoft co-founder Bill Gates has once again topped Forbes magazine list of the world's richest billionaires, for the fourth straight year, with a fortune of  $86 billion.

Next is Berkshire Hathaway chief Warren Buffett, with an estimated wealth of $75.6billion, followed by Amazon founder Jeff Bezos, with a net worth of $72.8billion. Number four is Amancio Ortega - Inditex fashion group founder  $71.3billion, while number 5 is Facebook founder Mark Zuckerberg with $56billion

Former world's richest man Carlos Slim comes in six with $54.5billion, while Oracle co-founder Larry Ellison came it at number seven with $52.2billion in the bank.

Republican mega-donors Charles and David Koch are in eighth and ninth with $48.3billion, while Michael Bloomberg rounded the top 10 out with $47.5billion. 

Meanwhile, Donald Trump's wealth plummeted down the list to number 544 with an estimated net worth of $3.5billion with $1billion being slashed from his valuation in the same list last year.

See the top 20 below... 

1. Bill Gates, Microsoft co-founder: $86billion

2. Warren Buffett, Berkshire Hathaway CEO: $75.6billion

3. Jeff Bezos, Amazon CEO: $72.8billion

4. Amancio Ortega, Inditex fashion group founder: $71.3billion  

5. Mark Zuckerberg, Facebook CEO: $56billion

6. Carlos Slim, Mexican telecom mogul: $54.5billion

7.  Larry Ellison, Oracle co-founder: $52.2billion

8. Charles Koch, Koch Industries CEO and chairman: $48.3billion

9. David Koch, Koch Industries CEO and chairman: $48.3billion

10. Michael Bloomberg, Bloomberg co-founder: $47.5billion

11. Bernard Arnault, LVMH CEO: $41.5billion

12. Larry Page, Google co-founder and Alphabet CEO: $40.7billion

13. Sergey Brin, Google co-founder and Alphabet president: $39.8billion

14. Liliane Bettencourt, L'Oréal heiress: $39.5billion

15. S. Robson Walton, Wal-Mart heir: $34.1billion

16. Jim Walton, Wal-Mart heir: $34billion

17. Alice Walton, Wal-Mart heiress: $33.8billion

18. Wang Jianlin, Dalian Wanda Commercial Property chairman: $31.3billion

19. Li Ka-shing, Cheung Kong Holdings CEO: $31.2billion

20. Sheldon Adelson,Las Vegas Sands Corporation CEO: $30.4billion