Stock market news, Oct. 8 -- Benchmark stock indices Sensex and Nifty 50 continued their upward momentum for the fourth consecutive day on Tuesday, driven by a rally in blue-chip bank stocks and domestic institutional investors' buying activity. The 30-share BSE Sensex increased by 136.63 points, or 0.17%, closing at 81,926.75 after a day of fluctuating trade. The index saw a notable rise, jumping 519.44 points, or 0.63%, to reach a high of 82,309.56 before profit-taking at higher levels pulled it back.

In a volatile session, Nifty 50 gained 30.65 points, or 0.12%, finishing at 25,108.30. Twelve of the 16 major sectors showed positive movement for the day, while broader mid-cap and small-cap indices increased by 0.5% and 0.3%, respective...