Australia's BHP Billiton ( BHP ) holds a 9.3% weighting in the fund. U.K.-based Rio Tinto ( RIO ), and Glencore on the London Stock Exchange, weigh in at around 7% apiece. IBD'S TAKE: BHP Billiton ranks 11th in the Mining-Metal Ores group, based on key stock gauges, including earnings, sales and stock price performance. To see which stocks rank in the top four of the group, including a BHP Billiton sister company, check out IBD Stock Checkup. U.S. steelmaker Nucor ( NUE ) and Japan's Nippon Steel & Sumitomo Metal have weightings near 3%. Other names in the top 10 holdings include Arizona-based miner Freeport-McMoRan ( FCX ) and South Korean steel maker Posco ( PKX ).