When Robert Pozen steps down as president of Fidelity Management & Research Company of Boston June 15 and Abigail P. Johnson takes over as president of one of the argest money managers in the world, a fundamental change in leadership style is likely to occur, according to industry analysts.

As the new president, Johnson is likely to try to loosen the tight rein of control that Pozen has held over the firm's portfolio managers but she will have to do so without compromising some of the valuable changes Pozen made while president, according to industry analysts.

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