The stock lost 3.41 per cent to Rs 321.95 at close on BSE. In intra-day session, it plunged 6.4 per cent to Rs 311.95.
At the NSE, shares of Sun TV declined by 3.34 per cent to Rs 322.
The company's market value dipped Rs 446.45 crore to Rs 12,687.55 crore.
"Sun TV plunged on reports that Prime Minister's Office has weighed in on the tussle between MHA and MIB over security clearance to 33 channels of Sun TV group," said Hiren Dhakan, Associate Fund manager, Bonanza Portfolio Ltd.
Meanwhile, Attorney General (AG) Mukul Rohatgi has supported grant of security clearance to 33 channels of the Kalanithi Maran-promoted firm.
The AG has supported grant of security clearance, saying the corruption cases being investigated against the network's promoter cannot be the ground to deny permission.
The AG was approached by the Information and Broadcasting Ministry to seek the opinion after the Home Ministry denied security clearance to the network.
The I&B Ministry issues broadcasting licences for which companies require a security nod from MHA.
