[citation needed] In 2008, Mantena co-produced Ghajini with Allu Aravind, which became the highest-grossing Indian film of that year.
[6][7] In 2011, Mantena co-founded Phantom Films with Anurag Kashyap, Vikas Bahl, and Vikramaditya Motwane.
[11] He is the founder and chief creative officer of the marketing company Big Bang Media Private Limited.
In April 2023, it was announced that Big Bang Media Ventures would be the exclusive marketing and commercial partner to the Hockey India League.
[16] Mantena married author and yoga teacher Ira Trivedi on 11 June 2023 in a traditional Hindu ceremony in Mumbai, which was attended by close family and friends.