Systems need to operate. So software companies made an industry out of it. Now it's worth about 500bn. Not bad. These include companies that fall under the umbrella "software as a service" (SaaS) - producing but not limited to information technology, cloud data services, cybersecurity, communication software to its users. Needless to say, as the future pivots to new modes of working, travelling, conducting business, and communicating, companies offering innovative software have ample room to grow.
So, below we've listed some established software companies based in the US, all with market capitalizations that range from 10bn-50bn. But make sure to do your own research before downloading any operating system onto your portfolio. We can't protect you against market malware.