Indian energy company Reliance Industries Ltd posted nearly flat fourth-quarter profits, in line with estimates, as a slimmer margin in its oilrefining business offset higher revenue. Reliance, which operates the world's biggest refining complex in western India, reported net profit of 56.31 billion rupees for the quarter to end-March, compared with analysts' expectations of 56.62 billion rupees. Its average gross refining margin dropped to $9.30 per barrel from $10.10 a year earlier, although it was up from the preceding quarter's $7.60. Net sales rose 13 percent. Investors have focussed, however, on the oil and gas production business at Reliance, India's second most valuable company which is controlled by its richest man, Mukesh Ambani.