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Standard & Poor's said Wednesday that flash memory company



will replace


( CHIR) in the

S&P 500


Chiron is set to be acquired by pharmaceutical giant



in a deal that is pending final approval. S&P said the index change will go into effect after the close of trading April 19.

Scientific Games


, a provider of gaming and lottery products, will replace SanDisk in the S&P MidCap 400.

Shares of SanDisk jumped $4.49, or 7.6%, to $63.96 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. Shares of Scientific Games also got a boost, adding $1.68, or 4.8%, to $36.80.

On Tuesday, Standard & Poor's said

Legg Mason


will be added to the S&P 500 to replace


( GDT), which is being bought by

Boston Scientific