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(The Associated Press circulated the following on December 4.)

NEW YORK — Standard & Poor’s on Tuesday said railway operator Kansas City Southern will replace CheckFree Corp. in the S&P MidCap 400 following the electronic payment provider’s acquisition by Fiserv Inc.

Fiserv said it completed its $4.4 billion cash buyout of CheckFree earlier in the day.

BioMed Realty Trust Inc., which manages research laboratories and office buildings, will take Kansas City Southern’s place in the S&P SmallCap 600.

The companies will be added to the indexes after the close of trading Thursday.

Kansas City Southern shares rose 66 cents to $34.95 in after-hours trading, after closing 47 cents higher at $34.29 during the regular session.