UnitedHealth shares was downgraded by Jefferies, on concerns related to political risks and competition.
Jefferies analyst David Windley lowered his rating on the healthcare company to hold from buy citing "the primary poison in the punch bowl, political risk, won't likely abate for at least another nine months."
Windley also indicated that UnitedHealth faces tough competition from Anthem, especially since the latter's market share is expanding while the two companies' geographies overlap.
The analyst also cut his price target on UnitedHealth shares to $235 a share from $300.
On the other hand, the analyst affirmed buy ratings on Anthem but cut his price target on its stock. He did the same for several other managed-care organizations like Centene, Cigna, Humana and Molina.