Striving to expand its investment in media companies, the Anil Dhirubhai Ambani Group (ADAG) has increased its stake in TV Today Network to over 10% by acquiring an additional 0.96% stake for an estimated Rs 6.50 crore.In an open market transaction that was carried out on February 12, ADA Group company Reliance Capital's subsidiary Sonata Investments bought 5.57 lakh shares, taking its shareholding in the media company to 10.27% representing 59.57 lakh shares, a TV Today regulatory filing on the NSE shows.Going by the intra-day high of TV Today at Rs 116.85 on February 12, Sonata Investments could have bought the shares for approximately Rs 6.50 crore.Sonata Investments previously held 54 lakh shares in TV Today, representing 9.31% stake.Early this week, Anil Ambani group company Reliance Capital had acquired over 6% stake in Global Broadcast News (GBN), for an estimated Rs 87 crore.After the said transaction, Reliance Capital holds 6.27% of the equity share capital of GBN.