The Sensex jumped over 1,200 points to 80,376 while the Nifty rose 380 points to hit 24,288 as the markets opened on Monday following a landslide victory in Maharashtra by the BJP-led alliance. Larsen, M&M, Reliance Industries, SBI and ICICI Bank were among the top gainers on Sensex. Shriram Finance, Bharat Electronics, Adani Ports and ONGC were top Nifty gainers.