OM Holdings Limited, an investment holding company, engages in mining, smelting, trading, and marketing manganese ores and ferroalloys. The company operates through Mining, Smelting, and Marketing and Trading segments. The company owns and operates Bootu Creek manganese ore mine located in the Northern territory of Australia. It also produces manganese ferroalloys, ferrosilicon, and manganese sinter ore; and trades in manganese ore, manganese ferroalloys, ferrosilicon, sinter ore, chrome ore, and iron ore. It has operations in the Asia Pacific, Europe, the Middle East, Africa, and internationally. OM Holdings Limited was founded in 1993 and is headquartered in Singapore.