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Midday movers: Twitter, Sprint, Paychex & more

Market Insider | What's Shaking | Stocks to Watch

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

Electronic Arts tumbled in wake of "Battlefield 4" problems, one of its biggest franchises.

J.C. Penney fell after Wells Fargo maintained an underperform rating on the retailer.

Twitter gained on news it was launching a new type of targeted ad that aim to change how advertisers convince consumers to spend.

Jack in the Box rose after Wedbush upgraded the fast-food chain to outperform from neutral.

Francesca's Holdings fell after the specialty retailer posted a decline in same-store sales and guided fourth-quarter results below consensus views.

Celgene gained after UBS upgraded the stock to buy from neutral.

Puma Biotechnology soared on positive data from the Phase II clinical trial of its experimental breast-cancer drug.

J.M. Smucker lost ground when Wells Fargo downgraded the stock to underperform from market perform.

Conn's gained after the appliance retailer posted double-digit gains and hiked its earnings estimates for the year.

Exxon Mobil fell after Raymond James downgraded the stock to outperform from strong buy, citing valuation.

Sprint climbed after Nomura Securities upgraded the stock to buy from neutral.

Paychex slid after Morgan Stanley began coverage with an underweight rating.

Arkansas Best rose after the company disclosed in an SEC filing it plans to consolidate 22 trucking terminals into nearby facilities, and save as much as $25 million a year. JP Morgan upgraded the stock to neutral.

Korn/Ferry rose after its second-quarter profit surged, boosted by an increase in revenue from the company's leadership and talent-consulting business.

(Read More: See CNBC's Market Insider Blog)

—By CNBC's Rich Fisherman.

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