The decision, experts said, will be a big boost for cross-border mergers and acquisitions here. The Income tax department's contention, if upheld, would have rendered standard transaction structures too risky forcing foreign companies to weigh potentially new litigation and insurance costs. BSE Bankex, Comsumer Durables and Oil & Gas indices were among the top performers, having gained 1-4% each. BSE banking index jumped 3.5% at 10,912 levels after both the food and December headline inflation eased significantly, improving growth outlook. The notable gainers from the pack were Axis Bank, ICICI Bank, Federal Bank, Bank of India and Bank of Baroda, 5-6% each. Axis Bank, country's third largest private sector lender, posted 24% increase in net profit at Rs 1,102 crore for the third quarter ended December, 2011. Net profit in the corresponding quarter a year ago stood at Rs 891 crore.