Fund Description

The fund seeks its objective by actively identifying potential investments using blended fundamental and quantitative analysis and constructing a portfolio while managing risk factors such as issuer, industry and sector weightings, market capitalization, and volatility relative to the Russell 1000 Growth Index. It normally invests at least 80% of net assets (including borrowings for investment purposes) in equity securities such as common stocks and depositary receipts. It focuses on companies believed to have above-average earnings growth potential, primarily large-cap, and may invest in foreign securities. MFS normally invests the fund's assets across different industries and sectors, but may invest a significant percentage of the fund's assets in issuers in a single industry or sector; the fund is non-diversified, which means it may invest a significant percentage of the fund's assets in a single issuer or a small number of issuers. Portfolio construction uses optimization targeting about 2% predicted tracking error versus the benchmark.