Natick (Mass.) Contributory Retirement System is searching for a manager to run $11.5 million in active domestic large-cap growth equities, said Kevin Leonard of consultant Segal Advisors. The $58 million system had performance concerns about its existing growth manager, which Mr. Leonard declined to name. The incumbent can rebid. RFPs are available by e-mail at [email protected]; the deadline for proposals is April 15.