The Indian equity benchmarks were trading with a negative bias on Monday dragged by losses in index heavyweights like Infosys, ICICI Bank, HDFC Bank, Kotak Mahindra Bank, ITC, Larsen & Toubro and HDFC. The Sensex fell as much as 438 points and Nifty 50 index dropped below its important psychological level of 17,000 amid weak global cues. Most of the Asian markets were trading lower following a weak closing of US markets on Friday. Hong Kong's Hang Seng fell 0.8 per cent, Taiwan Weighted dropped 0.6 per cent and South Korea's KOSPI declined 0.7 per cent.