The institutional share class offers the same S&P 500 exposure as SPYM and is aimed at employer-sponsored retirement plans and other eligible institutional investors.

State Street Investment Management has launched SPYMX, an institutional mutual fund share class of its State Street SPDR Portfolio S&P 500 ETF (SPYM), expanding the strategy into a structure tailored for retirement plans and institutional investors. US large-cap equities account for around 30% of assets in defined-contribution retirement plans nationwide The asset management firm said the fund is available to eligible employer-sponsored and state-sponsored retirement plans, including 401