Take a look at some of Thursday's midday movers:
Barnes & Noble - The bookseller rose after saying it would join forces with Samsung to develop Nook tablets.
Costco Wholesale - The warehouse club advanced after posting a better-than-expected rise in same-store sales in May.
General Motors - The auto manufacturer gained a bit after CEO Mary Barra said 15 employees have been fired and five others disciplined for failing to disclose a defect with ignition switches linked to 13 deaths.
Navistar International - The truck and engine maker climbed after reporting a smaller quarterly loss.
Rite Aid - The drugstore chain fell after lowering its 2015 earnings expectations.
Twitter - The social media company gained after saying it had purchased Namo Media to better position itself in mobile advertising.
Vera Bradley - The handbag and accessories designer slid after reporting first-quarter sales fell 29 percent.
Verizon Communications - The telecommunications firm gained after declaring a quarterly dividend of 53 cents a share.
Woodward - The provider of energy-control products and services rose after the company boosting its 2014 earnings and revenue outlook.
Zumiez - The specialty retailer of sports-related apparel rose after reporting stronger-than-expected May same-store sales growth.
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—By CNBC's Rich Fisherman.
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