American investment company FRM LLC, which belongs to Fidelity Investments Corporation, increased its stake in Yandex N.V. from 4.9% to almost 6%. FRM could buy Yandex shares on the OTC market at a large discount, experts suggest. At the same time it became known that another U.S. investment company - Invesco, reduced its stake in Yandex from 9% to 8.3%. The companies, including Yandex, decided to refrain from commenting.