OM Holdings Limited, an investment holding company, engages in mining, smelting, trading, and marketing manganese ores and ferroalloys worldwide. The company operates through Mining, Smelting, and Marketing and Trading segments. It owns and operates the Bootu Creek manganese ore mine located in the Northern territory of Australia. The company also produces and trades in ferrosilicon, manganese alloys, silicon metal, and manganese sinter ore. OM Holdings Limited was founded in 1993 and is based in Hamilton, Bermuda.