If you're not familiar with the "software-as-a-service" (SAAS) space, you might want to be, because it encompasses a lot of powerful performers. Some are huge, familiar businesses, and many are smaller start-ups.

In a nutshell, a software-as-a-service company offers businesses and/or consumers access to useful software without those customers having to host that software (and its required hardware) on-site. Instead, the software resides in the cloud. For example, a business might use a SaaS company's software to manage its payroll services, help administer its clinical trials, or host and analyze its databases.

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Image source: Getty Images.

Making millions

So how might you become a millionaire via SaaS stocks? The same way you would with any stocks. By investing money -- ideally meaningful sums regularly -- and giving the companies a lot of time to grow in value. The S&P 500 index of 500 of America's biggest companies has averaged annual gains annual gains of close to 10% over many decades. And many SaaS companies have been growing at a faster clip.

The table below models how your money might grow at 10% and at a faster rate, 15%:

$10,000 invested annually and growing for

Growing at 10%

Growing at 15%

10 years

$175,312

$233,493

15 years

$349,497

$547,174

20 years

$630,025

$1,178,101

25 years

$1,081,818

$2,447,120

30 years

$1,809,434

$4,999,569

35 years

$2,981,268

$10,133,457

40 years

$4,868,518

$20,459,539

Source: Calculations by author.

Note, of course, that depending on which stocks and/or indexes you invest in, and over what periods, your average annual gains might be greater than 15% or below 10%. There are not guaranteed returns.

Here are three SaaS companies to get to know and to consider for berths in your long-term portfolio. See which ones interest you most.

Three promising SaaS companies

Here are the companies, in the table below. I've selected them because their business prospects are promising and their valuations currently seem either attractive or at least reasonable. If you're interested in any, you'll want to research them further, but I'm offering a few data points as a start. Remember that these numbers might go up or down sharply in short order, if a company starts performing notably better -- or worse.

Company

Market capitalization

Recent quarterly revenue growth, year over year

Net profit margin

Forward price-to-earnings (P/E) ratio

Block (SQ 0.44%)

$44 billion

11.2%

2.9%

15.4

Veeva Systems (VEEV -1.18%)

$35 billion

14.6%

23.9%

32.1

Zoom Video Communications (ZM -0.27%)

$22 billion

2.1%

19.1%

13.6

Source: Yahoo! Finance as of late October, 2024.

1. Block

Block is a major player in fintech (financial technology), encompassing businesses such as Square, Cash App, TIDAL, and TBD. Square helps other businesses and consumers make commercial transactions -- you may be familiar with their countertop tablet-like payment terminals found in many stores and restaurants. Cash App lets users spend, send or invest money.

Block is well positioned to keep benefiting from the move toward digital payments -- both domestically and abroad. The company has been adding services in order to attract -- and keep -- more customers. Some investors are waiting for it to boost its profitability, though.

2. Veeva Systems

Veeva Systems is a business serving mainly the life sciences industry with its cloud-based services -- for example, helping pharmaceutical companies manage clinical trials for drugs in development. Its 1,000-plus customers include many of the biggest pharma companies and small biotech companies. Like many SaaS companies, it also uses a subscription model, generating fairly reliable recurring revenue. It has been a strong grower in recent years.

A particularly promising growth driver for Veeva is its move into new niches, where it can serve new customers. These include medical devices, consumer products, and chemicals.

3. Zoom Video Communications

Zoom is almost a household word, with many millions having participated in Zoom-hosted video conference calls. The company offers more, though, such as its AI-powered, collaborative "Zoom Workplace" platform; its Zoom Business Services for sales, marketing, and customer care teams; its Zoom Contact Center for managing customer relationships, and more. Zoom boomed during the pandemic's early years and is working on boosting growth again.

A plus is that many customers it gained during the pandemic's early years have stuck around and can now be offered more services. The company has embedded AI features for more than a million accounts, and customers have been spending more lately.

More possibilities

So... among the Saas companies above, which one(s) should you invest in? Which ones will make you a millionaire? Well, any of them could, but there's no way to know just how each of them will perform in the years ahead. You might also look into some well diversified giants, such as Alphabet and Microsoft, that also have considerable SaaS operations, largely due to massive cloud computing platforms.

Remember, too, that you don't have to choose individual companies. Instead of looking for the needles in the haystack, you might just invest in the haystack, such as via an SaaS-focused exchange-traded fund (ETF). Promising possibilities include the Fidelity Cloud Computing ETF (FCLD 0.07%), the iShares Expanded Tech-Software Sector ETF (IGV -0.22%), or the broader iShares US Technology ETF (IYW 0.04%).