Fidelity Investments, already top dog among U.S. mutual fund complexes in the retirement field, is positioning itself to get an even bigger chunk of the market.

By recently launching new investment services like the Fidelity Retirement Income Advantage Program, which among a number of things helps people streamline their investing resources with an eye on retirement, the Boston-based firm is poised to nab upwards of half of the 76 million baby boomers who will begin retiring in the next decade, according to Jim Lowell, editor of the independent newsletter Fidelity Investor.

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