Shares of Cairn India today gained 8.1 per cent on higher oil prices, valuations.
The stock extended the gains of previous two sessions and heads towards biggest single-day gain since June 2009.
Brent crude was up 2 per cent on an unexpected fall in US crude inventories and rally in global equity markets.
Cairn stock was trading at 5.9x on 12-month PE vs 9.7x of rivals, according to Eikon data.
Vedanta shares also rose as much as 7.5 per cent.