Stocks that moved substantially or traded heavily Tuesday on the New York Stock Exchange and Nasdaq Stock Market:
RadioShack Corp., down $3.05 at $7.18
The electronics and accessories retailer warned that is fourth-quarter earnings per share and gross margins fell from a year ago.
Archer Daniels Midland Co., down $1.08 at $28.63
Weakness in its oilseeds and corn processing units pushed the agricultural company's second-quarter net income down 89 percent.
United States Steel Corp., up $1.46 at $30.19
The steelmaker's fourth-quarter loss narrowed on strong demand for pipes and the company was optimistic about the current quarter.
Gentex Corp., down $3.25 at $26.87
The auto parts supplier's fourth-quarter net income rose 10 percent on increased shipments of its rearview mirrors to automaker, but its results missed Wall Street expectations.
Mattel Inc., up $1.47 at $31
Demand for the toy company's Barbie and Monster High dolls pushed its fourth-quarter profit up to a better-than-expected 14 percent.
Rent-A-Center Inc., down $3.37 at $33.82
The company, which operates stores that rents furniture to customers, posted fourth-quarter revenue that missed expectations.
Vertex Pharmaceuticals Inc., up $2.21 at $36.95
The company's cystic fibrosis drug was approved by U.S. regulators, offering treatment for some of the patients with the illness.
Rex Energy Corp., down $1.15 at $9.46
The oil and gas company, based in State College, Pa., said it would offer 7 million shares to raise money to pay off debt.