Feb 12 (Reuters) - South Korean e-commerce giant Coupang Inc, which is backed by SoftBank Group Corp, filed for a U.S. initial public offering on Friday, looking to cash in on a record boom in capital markets. Total revenue rose to $11.97 billion for the year ended Dec. 31, from $6.27 billion year earlier. Net loss narrowed to $474.9 million from $698.8 million in the same period. (Reporting by Niket Nishant in Bengaluru; Editing by Sriraj Kalluvila)