Jio Financial Services witnessed a 5% rally in its shares after announcing a joint venture with global asset manager BlackRock, marking its entry into wealth management and stock broking. The stock closed at Rs 362.7, up 2.4% from the previous day. This move aligns with the industry trend of adding 3 million new demat accounts monthly. The joint venture, focusing on the over Rs 50-trillion mutual fund business, is pending regulatory approvals.