Kumar Mangalam Birla purchased 4.09 crore additional shares in Vodafone Idea, equating to a 0.04% stake increase, bought at price ₹10.95 - ₹11.13, triggering a 4–5% surge in Vodafone Idea's share price on 9 February 2026, reflecting investor confidence in the promoter's commitment amid the company's ongoing debt challenges.