SPDR is a trademark of Standard and Poor's Financial Services LLC,[2] a subsidiary of S&P Global.
The name is an acronym for the first member of the family, the Standard & Poor's Depositary Receipts, now the SPDR S&P 500 Trust ETF, which is designed to track the S&P 500 stock market index.
SSGA also manage the SPDR Gold Shares, the largest commodity based ETF in the world.
This move united all U.S. ETFs managed by SSGA, a total of 23 at that time, under a single brand.
[5] In 1995, Mid-Cap SPDRs were launched by the Bank of New York to track Standard & Poor's S&P 400 index of middle-market equity shares.