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Standard & Poor's will add

Celgene

(CELG) - Get Celgene Corporation Report

to its

S&P 500

index to replace

AmSouth Bancorp

(ASO)

.

TheStreet Recommends

Regions Financial

(RF) - Get Regions Financial Corporation Report

is acquiring AmSouth in a deal expected to close by Nov. 6.

Regions, in turn, will supplant

RadioShack

(RSH)

in the S&P 100, Standard & Poor's said Monday.

RadioShack, with a market capitalization of about $2.4 billion, ranked 100th in the S&P 100 as of the close of trading Monday.

The moves will occur after the close of trading Nov. 3.

Shares of Celgene, a biotech company, climbed $2.15, or 4.3%, to $52 in after-hours trading. Shares of companies added to the S&P 500 often rise because fund managers who track the index have to own the shares.