On Thursday, August 25, key Indian stock indices finished the session marginally lower, although stocks firmed intraday. Although bearish sentiment prevailed, Indian pharmaceutical names powered ahead on the back of favorable news from some companies. O&Gnamesalsoturnedbullish.Notably, market uncertainty is being driven by Yellen’s upcoming speech in Jackson Hole. Market participants expect the Fed chair to shed some light on US monetary policy going forward. Recapping the indices, the Nifty 50 ticked down 0.67% to 8,592.20, while BSE Sensex retreated 0.8% to 27,835.91. In the blue-chip universe, the laggards were led by the likes of Adani Ports, Wipro, Bharti Airtel, Infosys, NTPC, and Tata Steel. On the upside, GAIL, ITC, Dr.Reddy's, Axis Bank, Cipla, and Lupin closed higher.In the currency market, the USD/INR pair edged down 0.07% to 67.06, while the 10-year government bond yield fell 0.22% to 7.12%. In corporate developments, Natco Pharma shares surged 4.3% to a high on news US regulatory authorities invalidated Teva Pharmaceutical’s two patents protecting Copaxone, a multiple sclerosis drug, from the production of generic drugs by its rivals. Also on the downside, seed supplier Monsanto India pulled back 2.8% as the company withdrew an application seeking approval for its next generation of genetically modified cotton seeds. Among the worst performers, textile producer Welspun India tanked 8.3% after US-based Target decided to terminate cooperation with the company. From a technical standpoint, a wedge continues to shape up in the daily chart, with a breakout paving the way for corrective movement.