The stock soared 19.80 per cent to settle at Rs 23.90 -- its upper circuit limit on the BSE.
The company's market value rose by Rs 237.69 crore to Rs 1,432.69 crore.
In terms of volume, 308 lakh shares of the company changed hands on the BSE during the day.
Under the revival plan, Singh would infuse Rs 1,500 crore into the carrier after acquiring over 58 per cent stake from outgoing promoters, Marans.
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"The company has been informed by Ajay Singh that the CCI has approved the proposed combination and acquisition of entire shareholding of Kalanithi Maran and Kal Airways Pvt Ltd (existing promoters) aggregating to 350,428,758 equity shares (58.46 per cent) by Ajay Singh, in terms of the Competition Act, 2002," the filing said.
Ajay Singh had yesterday said that Marans are expected to transfer their entire stake of over 58 per cent to him in next two days.
Singh is now awaiting nod from the Home Ministry for his appointment as Director on the Board of SpiceJet.
The deal has already been cleared by the Civil Aviation Ministry.
In late January, SpiceJet Board had approved transfer of Maran family's entire 58.46 per cent existing stake to Singh, while the company would raise Rs 1,500 crore through issuance of fresh securities.