Most of them.
An "X" company tells you (and them -- that's why companies position themselves) how to think about what they do.
So WMX is "in the trash business": sure they have logistics, and surely some custom software, but what they do is pick up the rubbish and bring it to the dump. End of story.
So Google (the world's largest advertising company) is called a "tech" company because without continuous work on their advanced technology they'd lose almost all their revenue. (what the rest of the people employed there do -- who knows? Nothing else contributes meaningfully to revenue). FB the same. Companies as diverse as Rambus, Cisco, NVidia, Apple, Boom (if they still exist), WhatsApp, Twitter (once upon a time) Snowflake...etc: technology is the linchpin of their work. Even Tesla, but not, say, for their BIPV (the roof tiles), which are decades-old me-too technology with no R&D at all.
At the opposite extreme, why was WeWork considered a "tech" business?
Uber employs a lot of programmers but I don't think of them as a tech business: their competitive advantage is their business model and their moat is branding, and they are all about piece work in small scale transport. There are plenty of useful SaaS companies who connected some existing packages and came up with a good new business, but aren't in the technology business; if they dumped k8s or Airflow or whatever and changed their stack it wouldn't matter much (so they never will).
There was a time when one or two people could make a product and be a tech company (Visicalc, 1.2 programmers; Intuit, 1 programmer), but nowaday if you can get into revenue with one or two programmers I'd say it's not a tech business. Can be a great business, don't get me wrong, but value, like Uber's, will come from domain strength and marketing/branding.
And to be a bit ad hominem: there's a higher density of tech businesses in Silicon Valley and a much lower density in SF. You can tell because the nerds in boring suburbia worry about bits and bytes and the folks up north use phrases like "founder lifestyle".