MSLC primarily invests in equity securities of US large-cap companies or other investments with similar economic characteristics. The fund uses the Russell 1000 Index as a benchmark for the market capitalization of eligible companies. This means that its large-cap universe may dip into mid-cap territory. To construct the portfolio, the fund employs a multi-manager strategy, with portions of the fund allocated to professional money managers who are responsible for investing the fund's assets. The fund may allocate up to 10% of its assets in foreign securities not traded on a US exchange or the US over-the-counter market. To generate additional income, the fund may lend portfolio securities. On December 9, 2024, MSLC converted from a mutual fund to an ETF structure, starting with $2.8 billion in assets.