S&P 500 Leaders and Laggards: RSH LTR

Shares of RadioShack, an electronics retailer, declined $2.37, or 13.5 percent, to $15.13 after posting a nearly 9 percent lower first-quarter profit.

Goodyear retreated $1.74, or 6 percent, to $27.17, after a JPMorgan analyst downgraded the stock.

Diversified holding company Loews shed $2.35, or 5.3 percent, to $42.28.

The S&P 500 lost 1.47 points to 1,396.37.

Wm. Wrigley Jr. Co. gained $14.46, or 23.2 percent, to $76.91 following news that Mars Inc., with financing help from billionaire Warren Buffett, is buying the candy and gum company for $23 billion.

Shares of Ford Motor Co. gained 71 cents, or 9.5 percent, to $8.21 as billionaire investor Kirk Kerkorian said he would boost his stake in the automaker.

Shares of Sysco Corp. advanced $2.38, or 8.5 percent, to $30.50, after the food distributor said quarterly profit rose 9 percent and topped Wall Street estimates.