After making a strong opening, shares of the state-owned firm further gained 5.19 per cent to Rs 304.95 on the BSE.
On the NSE, the stock shot up by 6.55 per cent to Rs 307.85.
"This special interim dividend is positive for minority shareholders of the company. We believe the stock is likely to react positively in the near-term," brokerage firm Angel Broking said in a report.
After including the dividend distribution tax of Rs 3,113 crore, the bonanza for the government is Rs 19,598.76 crore.
The announcement, which market observers termed as a special dividend to the government, comes at a time when the Centre's plans to sell 5 per cent stake in the company are facing strong opposition from trade unions.