INDIANAPOLIS - Four Hoosiers again rank among the richest people on the planet , according to Forbes' list of the world's top billionaires.

Ranking the highest among Hoosiers, Gayle Cook, 79, the widow of medical device maker and philanthropist William Cook, moved up one spot this year to 329 with a fortune of $4 billion, up from $3.4 billion last year.

More: Forbes list of billionares

Mall magnate and Pacers owner Herb Simon, 78, jumped to the 670th spot this year with an estimated worth of $2.2 billion, up from $1.8 billion and a ranking of 719th last year.

Meanwhile, Crown Point businessman Dean White, 89, kept his estimated fortune steady at $1.8 billion, but dropped in the ranking from 719 to 831.

Colts owner Jim Irsay's estimated fortune increased slightly from $1.4 billion to $1.5 billion, but the 53-year-old also fell in the rankings from 913 to 974.

Mexico's Carlos Slim remains the world's richest man for the fourth year in a row, while Warren Buffett dropped out of the top three for the first time since 2000.

A record 1,426 people around the world made Forbes magazine's latest annual tally of billionaires, up 16 percent from last year. Their average net worth was $3.8 billion, rising 3 percent from 2012. The total net worth for the list's billionaires was $5.4 trillion compared with $4.6 trillion a year ago.