Airbnb, Uber Technologies, and Super Micro Computer Have All Been Included in the S&P 500 in the Past Year. This Growth Stock Is on Track to Be Next, According to 1 Wall Street Analyst.

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The S&P 500 is arguably the most followed stock index in the world. It's existed in its current form since 1957 and tracks the 500 largest and most profitable publicly traded companies in the United States. Consequently, it's a benchmark for the stock market and the economy.

The obvious implication is that the constituents of this index are some of the biggest and the most influential companies in the world. If they're succeeding or struggling overall, chances are other companies are too.

Here's the thing, though: A list of profitable, important, and publicly traded companies isn't static -- things are constantly changing. And the S&P 500 is constantly updating which companies make the cut. In just the past year, Airbnb, Uber Technologies, and Super Micro Computer were added to the S&P 500 index.

Just think about it: 20 years ago, the idea of sharing a personal residence with travelers was ludicrous. But Airbnb has made a huge, profitable business of it since. It makes sense for Airbnb to be in the S&P 500 now, but no one would have predicted it years ago.

When it comes to Uber and Super Micro Computer, both businesses have improved enough to warrant inclusion. At one time, Uber had questionable profit prospects, but management cut spending and turned the corner. For its part, Super Micro Computer is suddenly at the center of the artificial intelligence (AI) revolution, earning it its own spot.

Investors can't know for sure which company will be next added to the S&P 500. But according to Barclays analyst Ramsey El-Assal, financial technology (fintech) company Block (NYSE: SQ) will likely be added this year. Here's why and here's what investors should do about it.

Why Block could be headed toward S&P 500 inclusion

Block is a fintech company, primarily offering products and services to individuals and businesses. Between fintech services to individuals through its Cash App ecosystem, as well as to businesses through its Square ecosystem, the company has processed over $200 billion in payment volume in the past year -- if you're looking for a consequential company for the S&P 500, this level of volume is worth noting.

Block generates revenue by taking a small percentage from transactions, and by offering many fintech software services. And this can be a very lucrative business.

To be clear, the company hasn't been consistently profitable since going public in 2015. But it's a recent point of emphasis, and profits absolutely surged higher in the first quarter of 2024, hitting an all-time quarterly high of $472 million.