Cerner to replace BJ Services on S&P 500

NEW YORK

Standard & Poor's on Thursday said Thursday that Cerner Corp. will join the S&P 500 index.

S&P MidCap 400 constituent Cerner, a healthcare information technology company, will replace oil services company BJ Services Co. on the S&P 500. BJ is being acquired by S&P 500 constituent Baker Hughes Inc.

Replacing Cerner in the S&P MidCap 400 will be S&P SmallCap 600 constituent Mednax Inc., a health care services company. Business software maker MicroStrategy Inc. will take Mednax's place on the S&P SmallCap 600.

The index changes will take place on a date to be announced.

Cerner shares climbed $2.55, or 2.9 percent, to $89.99 in aftermarket activity. They earlier rose 4 cents to close at $87.44.