At the same time, Unitex, which purchased Yukos' network of filling stations, will have to disclose its ownership structure to receive the regulator's approval, Igor Artemyev, head of the anti-monopoly service said.
Yukos, once Russia's largest oil company, was declared bankrupt on August 1, 2006, after three years of litigation with tax authorities over the company's tax arrears.
At the liquidation auctions held in late March-May, Rosneft bought Yukos's 9.44% stake in its capital, and also acquired Yukos's other oil assets.
Yukos, whose founder Mikhail Khodorkovsky is serving an eight-year prison term in Siberia after being convicted of fraud in May 2005, faces a total of more than 700 billion rubles (about $26.9 billion) in claims from creditors.
The press secretary for the Yukos bankruptcy administrator earlier said the auction proceeds would enable the company to meet all its creditors' claims.