Rodger A. Lawson, 63, president of Fidelity Investments since 2007, will step down in March. The fund giant will likely select one or possibly three successors from its executive committee, Lawson announced in a briefing Wednesday.

It is unclear whether Chairman Edward C. Johnson III, 79, will leave the firm as well, although two long-speculated choices to replace Lawson are Abigail P. Johnson, his daughter, and Jacques Perold, who became head of Fidelity's investment management last year.

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