The Apple Inc supplier posted a 876 billion won  ($711.13 million) operating loss for the October-December quarter, compared with a profit of 476 billion won in the same period a year earlier. It missed an average forecast of a 797 billion won loss from 10 analysts polled by Refinitiv SmartEstimate, which is weighted toward analysts that are more consistently accurate. ($1 = 1,231.8400 won) (Reporting by Joyce Lee)