Market share dynamics in action
Amazon (AMZN +2.46%) is one of the world's largest companies and has market leadership in some very influential business categories. The company that helped spearhead the growth of the e-commerce industry remains by far the biggest online-retail player in the U.S. market. It's also the second-largest overall retailer by revenue in the country, with only Walmart (NYSE:WMT) generating more sales in the category.
Not only is Amazon a retail giant, but it's also the current market leader in cloud infrastructure services. Amazon Web Services accounts for more than 30% of the total cloud market and is a huge profit generator for the company. On the other hand, Microsoft (MSFT +1.66%) has been gaining market share at an impressive clip in recent years and now accounts for more than 20% of category revenue. The overall size of the cloud services market has continued to increase. So have Amazon's sales in the category, but it's got a powerful competitor nipping at its heels.
Outside of these two business pillars, Amazon has been able to use its market-leading position in e-commerce as the foundation for a push into the digital advertising industry. Amazon stands as the third-largest digital-advertising company in the U.S. by revenue, trailing behind only Alphabet (GOOG +1.83%)(GOOGL +1.88%) and Meta Platforms (META +2.25%) in the space. Amazon has been rapidly gaining market share from its two largest competitors in the ads market, and it looks like that trend is on track to continue.