The queries from SEBI come after shares in United Spirits surged 23% in the four days leading up the September 25 announcement, jumping an additional 10% the day when the spirits maker disclosed the talks.
SEBI was investigating stock price movements at UB Group companies to check whether securities laws had been broken, a newspaper report said on Thursday citing an unnamed senior regulatory official. UB Group controls India's dominant spirits maker as well as debt-laden Kingfisher Airlines .
"We look at a lot of companies based on market movement and seek management's comments, but there is no formal probe yet (on UB)," a source at SEBI told Reuters.
United Spirits shares have been volatile through the year due to widespread speculation about the company's on-again, off-again courtship with Diageo. The volatility has come as Mallya has scrambled to raise funds for his ailing Kingfisher Airlines.
"We have provided the information," said Prakash Mirpuri, a spokesman with Mallya's UB Group, referring to the requests from SEBI. Mirpuri declined to say if the investigations are linked to United Spirits' share price movement.
"The movement in share prices of our group companies has been largely influenced by the wide speculation by the media, with no comments from us," he said.