According to the message, the seizure was imposed on ordinary registered shares of JSC Bashkir Soda Company, which are owned by JSC Regional Fund, JSC Bashkir Chemistry, LLC Trading House Bashkirskaya Khimiya.
Earlier, the Prosecutor General's Office organized a check on the legality of reducing the state's share in the BSK.
The department found signs of abuse, the materials will be sent to the UK.
At the end of August, Russian President Vladimir Putin ordered to deal with the legality of the loss of state control over the enterprise.
He criticized the owners, pointing out that the money earned is not invested in the region, but is withdrawn by shareholders to foreign accounts.