Sphere 500 Climate Fund (SPFFX) is a mutual fund that tracks the Sphere 500 Fossil-Free Index, providing investors with exposure to the top 500 U.S. companies by market capitalization excluding fossil fuel producers, distributors, refiners, and suppliers, as well as companies involved in deforestation, tobacco, civilian firearms, military weapons, and private prisons; the fund actively votes its shares in portfolio companies to support climate action proposals, distinguishing it from passive index funds that typically follow board recommendations. Launched on October 4, 2021, and domiciled in the United States with an expense ratio of 0.07%, SPFFX targets retirement plans such as 401(k)s, offering competitive performance correlated 99% with the S&P 500 while maintaining zero fossil fuel exposure and low emissions. Managed by Reflection Asset Management as the investment advisor, with U.S. Bank serving as custodian and distributor, the fund holds familiar large-cap names like Apple, Microsoft, Amazon, and Tesla, comprising approximately 97.98% U.S. stocks as of recent data.
The fund operates primarily in the U.S. equity large-blend segment, serving individual investors, family offices, institutions, and defined contribution plans without minimum initial investment requirements or hidden fees. Sphere, the organization behind SPFFX and headquartered in Walnut, California, complements the fund with tools like AtmoSphere, a platform for tracking and simulating 401(k) climate impact.
Recent developments include the addition of SPFFX to major 401(k) platforms Vanguard and Ascensus in 2025, expanding access to roughly 35 million participants; direct investment availability through Fidelity and Schwab brokerage accounts; and the launch of the AtmoSphere program to address the lack of climate options in 99% of U.S. 401(k) plans. Sphere onboarded a new team member with ESG expertise for defined contribution products and received support from entities like Maine State Treasurer for climate-aligned strategies. These expansions build on the fund's partnership with As You Sow for index exclusions and Reflection Asset Management for advisory services, enhancing its scalability in retirement investing.