Tata Sons, now debt-free, has asked the RBI to drop its 'upper-layer NBFC' tag and allow it to stay private.
The sharp pullback in mid and smallcap stocks signals a cooling-off period in segments that previously attracted considerable investor interest.
The company's market value rose by Rs 1,684.87 crore.
Earlier in April, Sun Pharmaceuticals Industries announced acquisition of Ranbaxy in an all-share deal.
Sun Pharma's Dilip Shanghvi is India's richest person.
With the Jaypee acquisition, the Suraksha group, which made lenders an offer of Rs 7,736 crore, will be able to expand its footprint in north India after making inroads in Mumbai's real estate market over the past year. Sudhir Valia, the promoter, was a co-founder and executive director of India's biggest pharmaceutical firm, Sun Pharmaceuticals, and is a close relative of Dilip Shanghvi.
Not much is heard or read about Sun Pharma's media-shy owner.
The Nifty50 slipped 33 points to close the session at 8,509 after hitting an intra-day high of 8,587.
Of the 23 Indian billionaires mentioned in the Bloomberg Billionaires Index, only one saw a reduction in net worth, with the companies owned by most of them outperforming the Nifty 50 index by a big margin.
Sun Pharmaceutical Industries will take a call on whether to shut Ranbaxy's troubled factories or make changes in the top management of the latter only after its $4-billion acquisition deal is complete.