Stocks that moved substantially or traded heavily Thursday on the New York Stock Exchange and Nasdaq Stock Market:
Eldorado Gold Corp., up $1.55 at $14.40
The mining company plans to more than double its gold production by 2016 and invest $1 billion for new mines in Greece.
Westinghouse Air Brake Technologies Corp., up $5.06 at $76.36
The rail industry parts maker boosted its full-year profit guidance, citing continued strong demand for freight cars and trains.
Hewlett-Packard Co., up $1.69 at $25.10
Research group Gartner said that the number of personal computers shipped worldwide rose more than expected in the first quarter.
The Home Depot Inc., up 88 cents at $50.63
A Janney analyst reiterated his "Buy" rating on the home improvement retailer's stock saying warm weather is boosting sales.
Avid Technology Inc., down $1.78 at $8.50
The maker of music and video recording equipment posted a first-quarter revenue outlook below Wall Street expectations.
Tractor Supply Co., up $5.65 at $97.95
The farm and ranch store chain said its first-quarter revenue climbed 22 percent to $1.02 billion, helped partly by warmer weather.
Pacira Pharmaceuticals Inc., down 39 cents at $9.73
The pharmaceutical company said it will sell 6 million shares of its stock to the public for $9.75 each, raising $58.5 million.