State Street SPDR S&P 500 ETF Trust

The SPDR S&P 500 ETF Trust is an exchange-traded fund offered under State Street's SPDR brand that aims to track the performance of the S&P 500 index; on the issuer's page its current name appears as State Street SPDR S&P 500 ETF Trust. It trades in the US on NYSE Arca under the ticker SPY and has been on the market since 1993.

The index is made up of large companies listed in the US and weights them by the size of their publicly available shares, so large companies in sectors such as technology, financials and health care carry a greater share of the fund. SPY is structured as a unit investment trust that holds the index constituents directly.

The fund's market price forms during the day according to supply and demand and can at times deviate from the fund's net asset value (NAV); the creation and redemption mechanism used by authorized participants helps limit this gap. The SPY page on Lzzo.com shows the price in US dollars, a historical chart and technical indicators; for fund expenses and the current portfolio breakdown, the issuer's official page should be treated as the reference.