Take a look at some of Tuesday's midday movers:
AK Steel Holding - The steelmaker gained after reporting losses narrowed in the second quarter.
Arch Coal - The miner rose after posting a smaller-than-estimated quarterly loss.
Avery Dennison - The supplier of pressure-sensitive materials fell after Topeka Capital downgraded its stock to hold from buy.
Blackberry - The maker of wireless devices fell after agreeing to buy Secusmart GmbH, a German provider of anti-eavesdropping technology.
Caterpillar - The maker of earth-moving equipment gained after saying it would repurchase $2.5 billion of its shares.
Chesapeake Energy - The natural-gas producer climbed on its plan to buy back $1.26 billion of preferred shares.
Corning - The glass maker declined after reporting second-quarter core earnings beneath expectations.
Costco Wholesale - The operator of membership warehouses rose after Goldman Sachs added it to its conviction buy list.
Honda Motor Co. - The car manufacturer advanced after posting better-than-expected earnings.
Level 3 Communications - The communications provider rose after reporting better-than-expected earnings.
The New York Times - The publisher fell after reporting a mild decline in second-quarter revenue.
Oshkosh - The maker of military and emergency vehicles dropped after cutting its full-year outlook.
Pharmacyclics - The drug developer rose for a second day after the FDA expanded approved uses of its treatment for leukemia. Leering upgraded the stock to outperform from market perform.
Reynolds American - The cigarette maker rose after tallying a rise in quarterly profit.
Spirit Airlines - The low-cost carrier edged lower after reporting second-quarter results.
TRW Automotive Holdings - The supplier of auto systems held steady after tallying better-than-expected second-quarter results.
Windstream Holdings - Shares surged after the company filed to spin off assets into a publicly traded real estate investment trust. Telecom rivals including CenturyLink, Frontier Communications, EarthLink Holdings, AT&T and Verizon Communications.
Wynn Resorts - The casino operator advanced after posting second-quarter earnings that beat forecasts. MGM Resorts, Las Vegas Sands and Melco Crown Entertainment followed suit.
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—By CNBC's Rich Fisherman.
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