NEW YORK — American General Corp., the life insurance company that is being bought by American International Group Inc., will be replaced on the S&P 500 Index by Ciena Corp., Standard & Poor’s has announced.

AIG, which is already a part of the S&P 500, says its shareholders have approved the $23 billion deal for American General. The transaction is expected to close this month.

Standard & Poor’s said Thursday that Ciena would be added to its index at a date to be announced.

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