The stock market experienced gains, led by defensive stocks, with the Nifty closing above 8450 and SBI reporting a 23% increase in Q4 net profits. Key changes included Tata Power replacing Lupin in the Sensex and Ceat Ltd showing a 50% rise in Q4 net profit. In technical analysis, the market faces resistance near 8500, with potential for declines if it falls below the crucial support level of 8350.