From Bloomberg:

Yandex NV (YNDX) surged to a three-month high in the U.S. as a deal to make Twitter Inc.’s feed available to users of Russia’s most popular search engine bolstered the outlook for the company.

Yandex jumped 6.8 percent in New York yesterday, the biggest gainer on the Bloomberg Russia-US 14 index of Russian companies traded in the U.S., which fell 0.2 percent to 108.92. Volumes for the Internet stock were the most since Jan. 26. Futures expiring in March on the dollar-denominated RTS Index added 0.2 percent to 165,340 in U.S. trading.

Tiger Global has been buying up alot of Yandex in recent quarters (Read more in our Q4 Report):