 At the end of 2006, the total portfolio that became known as SPDRs had $102 billion of assets under management.As of Dec 2019, SPDR is the third largest ETF provider, behind iShares and Vanguard, with assets of $714 bn.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.