Midday movers: Allergan, McDonald's, Sotheby's & More

Traders work on the floor of the New York Stock Exchange in New York.
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Traders work on the floor of the New York Stock Exchange in New York.

Take a look at some of Friday's midday movers:

Allergan - The Botox maker gained after Leering upgraded the stock to outperform from market perform.

Arista Networks - The network-switch maker rose after reporting better-than-expected second-quarter profits.

Hibbett Sports - The operator of sporting-goods stores declined after cutting its full-year earnings guidance.

McDonald's - The fast-food chain slid after reporting global sales dropped more than expected in July.

Medivation - The drug maker gained after hiking its full-year U.S. sales forecast for its prostate cancer drug.

Mercadolibre - The eBay of Latin America moved higher after posting better-than-expected quarterly earnings.

Mylan - The maker of generic drugs fell after RBC Capital downgraded its shares.

Post Holdings - The cereal maker dropped after cutting its earnings outlook for the year.

Salix Pharmaceuticals - The drug company dropped after reporting weaker-than-expected quarterly results.

Sotheby's - The auctioneer declined after tallying weaker-than-expected second-quarter results.

Tekmira Pharmaceuticals - The Canadian biotech firm surged after the Federal Drug Administration cleared its experimental Ebola drug for potential use.

Volcano - The medical-equipment maker fell after Oppenheimer downgraded the stock to market perform from outperform.

(See CNBC's Market Insider Blog)

—By CNBC's Rich Fisherman.

Questions? Comments? Email us at marketinsider@cnbc.com