Billionaire Adar Poonawalla, led Serene Productions, has bought a 50 per cent stake worth Rs 1000 crore in filmmaker Karan Johar’s Dharma Productions and Dharmatic Entertainment. Johar will continue as the creative head and executive chairman of the company. The partnership of Dharma Productions and Serene Productions aims to expand large-scale, multilingual productions, develop franchises and focus on evolving entertainment formats.