Standard & Poor's

will add

Fiserv

(FISV) - Get Report

and

Mirant

(MIR)

to the

S&P 500

index, the

second change to the large-cap market measure this week.

S&P MidCap 400

component Fiserv will replace

Old Kent Financial

(OK)

in the S&P 500 after the close of trading Friday. S&P 500 member

Fifth Third Bancorp

(FITB) - Get Report

is acquiring Old Kent in a transaction the companies expect to close on that date.

Equitable Resources

(EQT) - Get Report

will replace Fiserv in the S&P MidCap 400.

Mirant will replace

Briggs & Stratton

(BGG) - Get Report

in the S&P 500 after the close of trading Monday. S&P 500 component

Southern Co.

(SO) - Get Report

is spinning off its remaining 80.3% ownership stake in Mirant to Southern shareholders. Briggs & Stratton will be transferred to the

S&P SmallCap 600

index, replacing

P-Com

(PCOM) - Get Report

, which is being removed for lack of representation.

Additionally,

Coach

(COH)

will replace

Maxxam

(MXM)

in the S&P MidCap 400 after the close of trading April 4. S&P 500 member

Sara Lee

(SLE)

is splitting off the remaining 80.5% of Coach that it owns. Maxxam is being removed for lack of representation.