Palantir ( PLTR -0.25%) and UiPath ( PATH 0.32%) represent two different ways to invest in the growing artificial intelligence (AI) market. Palantir mines data from disparate sources to help its government and commercial clients make data-driven decisions, and UiPath's software robots help companies automate repetitive tasks.

Chipsets known as graphics processing units (GPUs) are an integral component in the development of artificial intelligence (AI) applications. At the moment, Nvidia (NASDAQ: NVDA) holds an estimated 88% of the AI GPU market thanks to its industry-leading A100 and H100 GPUs.

Many AI stocks already have those high expectations baked into their price, but there are still plenty of opportunities for investors. With just $400, you could buy a share of each of these three businesses, which include hardware, software, and the all-important infrastructure needed to tie it all together.

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Nvidia (NASDAQ: NVDA) is the leading supplier of graphics processing units (GPUs) for data centers, which are used to develop advanced artificial intelligence (AI) models. The company consistently grew its quarterly revenue by triple-digit percentages over the past year, propelling its market capitalization to $3.2 trillion.