MainStay S&P 500 Index Fund Investor Class
MYSPX
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- MainStay S&P 500 Index Fund Investor Class (MYSPX) is a passively managed mutual fund that seeks to replicate the total return performance of the S&P 500 Index by investing at least 80% of its net assets in a diversified portfolio of common stocks comprising the index; the fund holds large-cap U.S. equities across growth and value styles, with top holdings including companies such as Microsoft Corp., NVIDIA Corp., Apple Inc., Amazon.com Inc., and Berkshire Hathaway Inc.. It offers Investor Class shares subject to a 3% maximum initial sales charge and a 1% contingent deferred sales charge on certain redemptions within 18 months, alongside other share classes like Class A (MSXAX) and Class I (MSPIX) with varying fee structures and no initial sales charge for Class I; the fund maintains a low turnover rate of approximately 2% and targets institutional and retail investors seeking broad U.S. large-blend market exposure.. Managed by New York Life Investment Management LLC, a subsidiary of New York Life Insurance Company founded in 1845 and headquartered at 51 Madison Avenue in New York, NY, with key operations in Jersey City, NJ, the fund operates within the global asset management platform of New York Life Investments, which oversees approximately $725 billion in assets under management across mutual funds, ETFs, and alternative investments.. In recent developments, the fund underwent a name change from MainStay S&P 500 Index Fund to NYLI S&P 500 Index Fund effective August 28, 2024, as part of New York Life Investments' broader rebranding of its MainStay and IndexIQ fund lineup initiated in August 2024 to unify branding under NYLI; this followed an earlier name simplification in February 2022 from MainStay MacKay S&P 500 Index Fund.. Additionally, New York Life Investments announced in September 2025 plans to unify its general account and third-party asset management businesses into a single global platform with $785 billion in assets under management effective January 1, 2026, enhancing capabilities in public and private markets, while pursuing strategic partnerships such as a December 2024 minority investment in Andera Partners for private markets expansion.. The fund serves primarily U.S.-based investors through broker-dealers and financial advisors, with geographic focus on U.S. large-cap equities mirroring the S&P 500's domestic composition..