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The encyclopedia · Finance & Accounting · Financial decision · 1993

SPDR let investors trade the S&P 500 like a stock, and ETFs were born.

Amex and State Street wrapped an index portfolio in a listed security whose shares were created and redeemed in kind, keeping price near value.

State Street Global Advisors · American Stock Exchange

the move

Index investing existed only through mutual funds, which priced once a day and made investors transact with the fund company. On January 22, 1993 the American Stock Exchange listed SPDRs, Standard & Poor's Depositary Receipts, an exchange-traded unit investment trust tracking the S&P 500, the first US-listed ETF.

The mechanism that made it work was in-kind creation and redemption. A 1997 Federal Register order described how an investor making a portfolio deposit into the trust received a Creation Unit composed of 50,000 SPDRs, and how the trust was structured so one SPDR's net asset value equaled one-tenth of the S&P 500 Index.

That convertibility is the engine: if the ETF trades above the basket, arbitrageurs create new units and sell them; if below, they buy units and redeem them. Trading the whole index as one share gave investors intraday liquidity, lower cost and tax advantages mutual funds could not match.

why it works

  • Creation and redemption in kind means the trust never liquidates holdings to meet redemptions.
  • Arbitrage between share price and basket value keeps the ETF close to its net asset value.
  • Exchange listing gave intraday pricing instead of a once-a-day fund price.
  • The structure could be copied, so one product turned into an industry.
the payoffTrade portfolio as one share.inspired

what transfers

Make a fund's shares convertible into the underlying assets and arbitrage does the market-making for you: price stays honest without a manager trading on your behalf.

what came after

SPY grew into the world's largest ETF; by 2023 State Street reported more than $355 billion in assets and average daily trading of $39 billion. ETFs now cover nearly every asset class and country, and the creation-and-redemption structure pioneered in 1993 is the template the industry runs on.

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