Amazon's (NASDAQ: AMZN) investment in electric vehicle (EV) maker Rivian Automotive (NASDAQ: RIVN) gets a fair amount of coverage in the financial press, but many investors are probably not aware that the e-commerce giant owns stock in nine other publicly traded companies.

On July 30, Amazon disclosed via a filing with the Securities and Exchange Commission (SEC) that it owned shares of 10 public companies as of the end of the second quarter. Its 10-stock portfolio was worth $2.53 billion on June 30.

Given Amazon's massive size, $2.53 billion is a relatively small number. It's under 1% of Amazon's market cap of $1.76 billion. So, changes in the prices of Amazon's stock holdings are not likely to move the needle much for Amazon's financial performance or stock price. However, they can make a little difference. In the second quarter, the e-commerce leader recorded "marketable equity securities valuation gains" of $443 million (the bulk of which was from its Rivian stock stake), which was 3.3% of its quarterly net income.

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Source Fool.com