Take a look at some of Thursday's midday movers:
Royal Caribbean Cruises - The cruise operator declined after it posted weaker-than-expected quarterly results. Rival Carnival also fell.
Kate Spade - The marketer of apparel and accessories surged after its full-year sales jumped 40 percent.
Zoetis - The maker of animal drugs rose on a Reuters report that activist-investor Bill Ackman was poised to win seats on its board.
Harman International Industries - The audio-systems maker rose after it posted better-than-expected quarterly earnings.
Boeing - The plane manufacturer advanced after beating quarterly profit and revenue estimates.
JetBlue Airways - The carrier soared on better-than-expected fourth-quarter earnings. Competitors including American Airlines Group, United Continental Holdings, Delta Air Lines and Southwest Airlines rose as well.
PulteGroup - The home builder rose on better-than-expected quarterly earnings. Rivals including Lennar, KB Home, DR Horton and Toll Brothers also climbed.
Helmerich & Payne - The oil-and-gas driller fell after issuing cautious guidance.
Dow Chemical - Shares rose after the company beat fourth-quarter earnings estimates.
Campbell Soup - Shares edged higher after it said it would reorganize its business.
Viacom - The media company rose after saying it would introduce an online video streaming product for its Nickelodeon network.
Barrick Gold - The gold producer and others including Newmont Mining, Goldcorp and Yamana Gold fell with the price of the metal.
EMC - The maker of data-storage equipment dropped as it forecast a lower-than-expected profit for the year.
Royal Dutch Shell - The oil producer dropped after saying it would cut spending by $15 billion over the next three years.
Air Products and Chemicals - The maker of specialty gases rose on better-than-expected first-quarter earnings.
Thermo Fisher Scientific - The maker of scientific instruments rose after posting better-than-expected fourth-quarter earnings.
Raytheon - The weapons maker declined after it forecast 2015 revenue below estimates.
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