₹4172.60 on Thursday after the company's US-based parent reported positive preliminary results from a joint project to develop coronavirus vaccine.At 12:30 pm, Pfizer shares were at ₹4163.95, up 4.76% from the previous close, while the benchmark index, Sensex gained 1.25% to 35856.53.BioNTech and Pfizer pick the most promising of four experimental vaccines for a trial, involving up to 30,000 healthy participants, that is likely to begin in the United States and Europe in late July, if it gets the regulatory green light.