Yes, an individual can purchase S&P 500 as a single share through various investment methods. While it is not possible to buy the S&P 500 as a single stock, there are several ways to gain exposure to the index. One option is to buy individual stocks of the companies listed in the S&P 500. Another way is to invest in an S&P 500 index fund or exchange-traded fund (ETF) that tracks the performance of the index. These funds hold a diversified portfolio of stocks that replicate the S&P 500 index, allowing investors to gain exposure to the entire index with just one investment. Additionally, some brokers offer fractional share investing, which allows investors to purchase a portion of a single share of an S&P 500 stock.

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