Indian markets extended their rally for a fifth day, with Nifty and Sensex gaining nearly 4 per cent. Key stocks to watch on April 9 include Bosch and Redtape for major acquisitions, and NHPC and NTPC for massive energy projects. Lupin's USFDA win and Poonawalla Fincorp's INR 5,000 crore QIP plan further highlight a robust day for corporate activity.