Mankind Pharma shares made a blockbuster stock market debut on Tuesday. The stock opened for trading at Rs 1,300 on the National Stock Exchange and BSE, marking an upside of 20 per cent from the initial public offering (IPO) price of Rs 1,080. The stock rose as much as 28 per cent to hit an intraday high of Rs 1,385 on the BSE and it touched an intraday high of Rs 1,386 on the National Stock Exchange.