Benzinga's Top Downgrades

Analysts at Canaccord Genuity downgraded 21Vianet Group

from Buy to Hold. The price target for 21Vianet Group is set to $19. 21Vianet Group's shares closed at $20.76 yesterday. Analysts at Wells Fargo downgraded U.S. Silica Holdings

from Outperform to Market Perform. U.S. Silica's shares closed at $43.70 yesterday. Analysts at Needham downgraded Cubic

from Buy to Hold. Cubic's shares closed at $47.07 yesterday. Analysts at JP Morgan downgraded Copa Holdings, S.A.

from Overweight to Neutral. Copa Holdings' shares closed at $109.26 yesterday.