The Standard & Poor's 500 index finished higher on Wednesday after the Federal Reserve board left interest rates unchanged.
The index added 7.68 points to 1,321.97.
Shares of Jabil Circuit Inc. advanced $2.24, or 15.6 percent, to $16.57 after the electronics maker said fiscal third-quarter profit rose sharply.
Shares of Dean Foods Co. rose $1.73, or 9.4 percent, to $20.12. The milk processor raised its second-quarter profit outlook.
Shares of chemical company Ashland Inc. gained $4.46, or 9.3 percent, to $52.67 following an analyst upgrade.
On the negative side, shares of industrial parts maker Rockwell Automation Inc. dropped after the company said it does not think it will reach its fiscal 2008 profit forecast. Shares lost $6.42, or 12.3 percent, to $45.77.
Shares of for-profit education company Apollo Group Inc. declined $3.78, or 7.2 percent, to $49.05 after President Brian Mueller left the company, effective immediately.
After a Goldman Sachs analyst cut his rating on Boeing Co., the aircraft maker's stock hit a two-year low. Boeing shares retreated $5.15, or 6.9 percent, to $69.64, reaching a low point of $69.16.