Gazprom has made an approach to buy the 57.5% stake in Russia's number-five oil company owned by Abramovich's holding company Millhouse Capital, Moscow daily Vedomosti reported, quoting several sources familiar with the situation.
A spokesman for Sibneft said the company was not on offer, but the report still sent Sibneft's shares 4.4% higher at the opening to $3.07, valuing the company at around $14 billion.
"Sibneft's
