Take a look at some of Tuesday's midday movers:
Yandex - On the day that Google broke above $800 a share for the first time, Yandex tumbled after Russia's dominant Internet search company said fourth-quarter profits came in below estimates and revenue growth slowed.
Health care insurers fell after the federal government's proposed 2014 payment rates for the Medicare Advantage plans were lower than expected. Humana, UnitedHealth, Cigna, Wellcare Health Plans, Coventry Health Care and Health Net were among insurers trading lower.