Alfa Group became a minority owner of the Opin development company controlled by Mikhail Prokhorov's Onexim Group when Alfa Capital Holdings acquired the 10.74 percent stake of NKB Investments, an affiliate of UralSib, Vedomosti reported.
Onexima still owns 83.17 percent of Opin.
In September 2011, Onexim decided to consolidate shares in Opin and last month offered minority shareholders 534.96 rubles ($178) per share. The company is now trading on the MICEX-RTS at 523 rubles. The offer is valid through May 28.