Stef Wertheimer topped the nine Israelis included on the Forbes annual list of the world's billionaires released over the weekend. Wertheimer and family, who come in at number 188 on the list with wealth valued at $4.1 billion made the jump after selling 80% of his Iscar Metalworking Co. to Warren Buffett in 2006 for $5b., allowing him to pass Shari Arison for title of wealthiest Israeli. Arison slipped to number 194. Lev Leviev moved up to number 210 from 278 last year as his personal fortune grew by $1.5b. to $4.1b. over the year. Making an even bigger move upwards was Yitzhak Tshuva, the majority owner of the Delek Group, who moved up 168 spots from 382nd place in his debut year in 2006 to number 214. Rounding out the top five of richest Israelis was Sammy Ofer, and family with $3.9b. Other Israelis who made the billionaires list are Arnon Milchan, the film producer, worth $3b.; diamond magnate Benny Steinmetz ($1.7b.) and Morris Kahan, the owner of the Eilat underwater observatory ($1.1b.) and Alexander Machkevich, the Kazakhstan entrepreneur worth $1.9b. is the president of the Euro-Asian Jewish Congress and is listed as an Israeli citizen by Forbes. Bill Gates, the founder of the Microsoft Corporation, retained his hold on the number one spot, on the overall list with a worth of $56b., followed by Buffett with an estimated $52b. A total of 946 people made the list, including 178 newly minted members of the exclusive club and 17 who rejoined after not making the list last year.