From the original post, the next biggest category after “tech” is “Business & Professional Services“ at 24.2% of total (or 171 companies). This category includes - quoting the top few industries - financial services, business consulting, advertising services and recruitment.

With the exception of some financial services, these do not sound like industries whose companies have large internal IT presence.

The next largest categories are manufacturing/engineering, health, government, and energy. I agree that all of these fit your bill (government, perhaps less so).

I work for a construction company and there’s like 15,000 employees but only like 500 of us are software engineers (we’re outnumbered a lot by other engineers, obviously) It’s still enough people to fill up a nice sized building.