Take a look at some of Tuesday's midday movers:
American Express - The supplier of credit cards and travel-related services rose after Macquarie upgraded the stock to neutral from underperform.
Apple - The provider of consumer technology hit $100 a share for the first time since its seven-for-one split in June.
Celgene - The biotechnology company rose to a record after saying its drug performed well in a trial for patients with a form of lymphoma.
El Pollo Loco Holdings - The operator of quick-service restaurants fell as numerous analysts began coverage with bearish calls.
GameStop - The video-game retailer climbed after it said in a regulatory filing that the prognosis for a full recovery was very good for its CEO after surgery to remove a cancerous brain tumor.
Google - The search engine advanced on the 10th anniversary of going public.
Lennar - The home builder gained along with others including KB Home, PulteGroup, D.R. Horton and Toll Brothers after data showing housing starts and building permits rebounded strongly in July.
McDonald's - The fast-food chain climbed amid plans to sell packaged coffee at supermarkets nationally by early next year in a partnership with Kraft Foods Group.
Perfect World Co. - The Chinese game developer dropped after posting weaker-than-expected second-quarter revenue.
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—By CNBC's Rich Fisherman.
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