Take a look at some of Thursday's midday movers:
Chipotle Mexican Grill - The food chain rose after Raymond James raised its earnings expectations for the second quarter and full year, raising its price target to $625 from $560.
Keurig Green Mountain - The maker of one-cup brewers rose, a day after saying it was teaming up with fast-food chain Subway to sell its single-serve brewers at Subway shops.
Merck & Co - The pharmaceutical company rose after its research chief told a conference the company is aiming for a big share of the hepatitis C market.
MobileIron - The developer of technology platforms soared in its market debut after pricing 11.1 million shares at $9 a piece.
Sprouts Farmers Market - The upscale grocer gained after Credit Suisse upgraded it to outperform from neutral.
Sunesis Pharmaceuticals - The climbed drug developer climbed after UBS began coverage with a buy rating,
Twitter - The micro-blogging service rose after Chief Operating Officer Ali Rowghani resigned.
Vipshop Holdings - The Chinese online flash sale site advanced after Barclays began coverage with a buy rating.
W.W. Grainger - The distributor of industrial supplies fell after reporting May sales results.
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—By CNBC's Rich Fisherman.
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