What is the difference between VOO and SPY?

VOO and SPY are both ETFs that track the S&P 500 Index, but there are some differences between them: 1. **Issuer and Expense Ratio**: VOO is issued by Vanguard and has an expense ratio of 0.03%, while SPY is issued by State Street Global Advisors and has an expense ratio of 0.09%. Vanguard's lower expense ratio means that VOO has lower fees compared to SPY. 2. **Assets Under Management**: VOO has assets under management of $861.47 billion, while SPY has $705.13 billion. This indicates that VOO has a larger market capitalization and may be more liquid than SPY. 3. **Top Holdings**: Both ETFs have similar top holdings, with the exception of the weight of NVIDIA Corp. VOO has a higher weight of NVIDIA Corp. at 7.75% compared to 7.61% in SPY. 4. **Performance**: Over the past year, both ETFs have performed similarly, with slight differences in monthly returns. VOO has a 1-year percentage change of 13.62%, while SPY has a 1-year percentage change of 13.61%. 5. **Net Fund Flow**: VOO has seen significant net fund inflows of $132.04 billion over the past year, while SPY has seen net fund outflows of $13.63 billion. This indicates that investors have been favoring VOO over SPY. 6. **Technical Indicators**: Both ETFs have similar technical indicators, such as the 5-day and 10-day moving averages, MACD, support and resistance levels, and Bollinger Bands. These indicators suggest that both ETFs are trading in a similar range-bound pattern. In conclusion, while both ETFs track the S&P 500 Index, VOO has a lower expense ratio, larger assets under management, and has been favored by investors in terms of net fund flows. However, the difference in performance between the two ETFs over the past year has been minimal.