State Street Corp.'s financial advisory arm stepped up its involvement Tuesday in the rapidly expanding exchange-traded fund business, launching portfolios based on the Fortune 500 and Fortune e-50 stock indexes.

The Boston banking company will list the Fortune 500 Index Tracking Stock and Fortune e-50 Index Tracking Stock funds on the American Stock Exchange. The Fortune 500 Index portfolio is based on Fortune's list of America's 500 largest companies. The Fortune e-50 Index fund is based on the 50 largest Internet companies.

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