SunCoke Energy (SXC) announced today that its wholly-owned subsidiary, SunCoke Energy Partners, has launched its IPO of 13,500,000 common units representing limited partner interests pursuant to a registration statement on Form S-1 filed with the US Securities and Exchange Commission (SEC). The Partnership will grant the underwriters a 30-day option to purchase up to an additional 2,025,000 common units at the IPO price, less underwriting discounts.