NEW YORK_Stocks that moved substantially or traded heavily Friday on the New York Stock Exchange and Nasdaq Stock Market:

NYSE

General Motors Corp., down 49 cents at $1.43

The leader of the Canadian Auto Workers union said it was "very likely" the auto maker will file for Chapter 11 bankruptcy protection.

Sears Holdings Corp., up $5.21 at $55.40

The Sears and Kmart stores parent reported a profit that surprised investors despite a 9 percent drop in sales from a year ago.

Aeropostale Inc., up $1.18 at $33.73

The teen apparel retailer's profit jumped 81 percent as sales rose, and analysts said it was taking market share from competitors.


American International Group Inc., down 10 cents at $1.70

The insurer's chairman and CEO is leaving as it tries to spin off large divisions to pay the government back more than $180 billion.

LDK Solar Co. Ltd., down $1.53 at $7.77

The China-based maker of wafers for solar cells swung to a first-quarter loss and wrote down extra charges in 2008.

Salesforce.com Inc., down $3.50 at $36.15

The sales management software maker had good cash flow in the first quarter, but its revenue forecast pointed to slower sales growth.

NASDAQ

Red Robin Gourmet Burgers Inc., down $3.75 at $17.86

The casual dining chain said its same-store sales decline was accelerating, and it expects commodity and labor costs to increase.

Cougar Biotechnology Inc., up $5.84 at $42.82

Johnson & Johnson said it would buy the cancer treatment developer for $43 a share in cash, or about $894 million.