Introduction to SPY: The Original S&P 500 ETF

SPDR S&P 500 ETF Trust, commonly known by its ticker SPY, is one of the most widely traded exchange-traded funds in the world. Launched in 1993 by State Street Global Advisors, SPY was the first ETF listed in the United States. It aims to track the performance of the S&P 500 Index, which comprises 500 of the largest publicly traded companies in the U.S. As of 2025, SPY has over $500 billion in assets under management, making it the largest ETF by assets and trading volume.

How SPY Works

SPY is a passive investment vehicle that seeks to replicate the holdings and returns of the S&P 500 Index. The fund invests in all 500 stocks in the index, with weights proportional to their market capitalization. This means that larger companies like Apple, Microsoft, and Amazon have a greater impact on the fund's performance. SPY is structured as a unit investment trust, which differs from many other ETFs that are structured as open-end funds. This structure imposes certain restrictions, such as the inability to reinvest dividends immediately, but it also provides tax efficiency and transparency.

Key Features of SPY

  • Liquidity: SPY is one of the most liquid ETFs, with daily trading volume often exceeding 100 million shares. This makes it easy to buy and sell at tight bid-ask spreads.
  • Expense Ratio: The expense ratio for SPY is 0.0945% as of 2025, which is slightly higher than some competing S&P 500 ETFs like VOO (0.03%) and IVV (0.03%). However, SPY's liquidity and options market make it a preferred choice for active traders.
  • Dividends: SPY pays quarterly dividends, which are distributed from the dividends received from the underlying stocks. The dividend yield typically mirrors that of the S&P 500, around 1.5% to 2%.
  • Options Market: SPY has the most liquid options chain of any ETF, allowing investors to implement sophisticated strategies like covered calls, protective puts, and spreads.

Performance and Historical Returns

SPY's performance closely tracks the S&P 500 Index. Over the long term, the S&P 500 has delivered an average annual return of about 10% before inflation. However, past performance does not guarantee future results. In 2025, SPY has been influenced by factors such as interest rate decisions by the Federal Reserve, corporate earnings growth, and geopolitical events. The fund's total return includes both price appreciation and dividends. For example, in 2023, SPY returned approximately 24%, while in 2022 it fell about 18% due to rising interest rates and inflation concerns.

How Investors Use SPY

SPY is versatile and used by various types of investors:

  • Long-term investors: Many use SPY as a core holding in their portfolio to gain broad exposure to the U.S. stock market. It is a common choice for retirement accounts like IRAs and 401(k)s.
  • Active traders: Due to its high liquidity and options market, SPY is popular for day trading, swing trading, and hedging. Traders can use SPY to bet on market direction or to hedge against portfolio risk.
  • Institutional investors: Large institutions use SPY for cash equitization, where they temporarily invest cash in SPY to maintain market exposure while deploying capital into individual stocks.
  • Options strategies: The SPY options market is the most active in the world. Investors write covered calls to generate income or buy puts to protect against downturns.

Comparing SPY to Other S&P 500 ETFs

While SPY is the most popular, there are other S&P 500 ETFs that offer lower expense ratios. VOO (Vanguard S&P 500 ETF) and IVV (iShares Core S&P 500 ETF) both charge 0.03% and are often preferred by buy-and-hold investors. However, SPY's liquidity and options market remain unmatched. For example, the bid-ask spread for SPY is typically $0.01, while for VOO it may be $0.02 to $0.03. For large trades, SPY's tighter spreads can offset the higher expense ratio. Additionally, SPY's options market offers more strikes and expiration dates, making it superior for options trading.

Risks and Considerations

Investing in SPY involves market risk, as the fund will decline in value when the S&P 500 falls. Since SPY is concentrated in large-cap U.S. stocks, it lacks diversification across small-cap, international, and fixed-income assets. Additionally, SPY's structure as a unit investment trust means that it cannot engage in securities lending to generate additional income, unlike some other ETFs. This can result in slightly lower returns compared to similar funds that lend shares. Finally, investors should be aware of the tax implications of trading SPY frequently, as short-term capital gains are taxed at higher rates.

How to Buy SPY

SPY can be purchased through any brokerage account, including online brokers like Fidelity, Charles Schwab, Robinhood, and E*TRADE. Investors can buy whole shares or fractional shares, depending on the broker. The minimum investment is the price of one share, which as of 2025 is around $450. For those looking to dollar-cost average, many brokers allow recurring investments in SPY with no commission. It is also available in tax-advantaged accounts like IRAs, where dividends can grow tax-deferred.

Conclusion

SPY remains a cornerstone of the ETF market, offering investors a liquid, transparent, and efficient way to invest in the S&P 500. Whether you are a long-term investor seeking broad market exposure or an active trader looking for a liquid instrument, SPY provides a reliable option. While its expense ratio is higher than some competitors, its liquidity and options market make it a compelling choice for many. As always, investors should consider their own financial goals and risk tolerance before investing.