Hyundai Mobis, South Korea's largest auto parts maker, said Friday its net earnings for the first quarter rose 5.3 percent on-year to 817.7 billion won (US$787.5 million) from an increase in demand for key automotive modules. Operating profit jumped 13.6 percent to 721 billion won in the same period, with sales rising a solid 10 percent from the year before to 8.92 trillion won, the company said in a regulatory filing.