Drug major Sun Pharmaceutical Industries will increase stake in its subsidiary Ranbaxy Malaysia to 79.5 per cent through purchase of shares. One of the wholly owned subsidiaries of the company has agreed to increase its shareholding in Ranbaxy Malaysia by 8.3 per cent. Ranbaxy Malaysia is a subsidiary of Sun Pharma, and the company along with one of its wholly owned arms has 71.2 per cent shares prior to the acquisition.