The Moscow Exchange halted stocks trading on Feb. 28, days after Russia began what it calls a "special operation" in Ukraine. This week, the central bank ordered the bourse to remain shut until at least March 18.

ITI Capital said it will buy or sell shares in Russia's largest lender Sberbank, gas giant Gazprom, metals producer Norilsk and second-largest oil producer Lukoil.

ITI Capital will take orders under its "Blue chips - there is a way out!" programme until trading on the Moscow Exchange is resumed or until further notice from the company.

"We think it is really important to give clients the ability to buy or sell shares in Russia's largest companies in the conditions when the bourse is closed," ITI Capital said.

"Clearly, the deal carries high risks as in the current situation it is really difficult to forecast both shares prices and the date of Moscow Exchange opening."

(Reporting by Reuters; editing by Jonathan Oatis)