The Pioneer Oak Ridge Small-Cap Growth Fund/A (ORIGX), a top performing fund that invests in small companies, will close to most new investors on Wednesday.
The action is aimed at keeping assets in the fund from increasing to the point where they hurt its performance.
Pioneer has planned to close the fund when its assets reach about $225 million, the fund company said in a regulatory filing. The fund will remain open to new investors who buy shares for retirement accounts, such as 401(k) plans.