Is there widespread agreement on what it means to be a "tech company"? Is a tech company or tech city just a company or city with a lot of software jobs? Or d

Is there widespread agreement on what it means to be a "tech company"? Is a tech company or tech city just a company or city with a lot of software jobs? Or do people generally construe it to encompass more than software (batteries, nuclear reactors, pharmaceuticals)? Are some kinds of software excluded because they aren't novel enough? Can Uber, FedEx, and Walmart all have the same level of technological sophistication and still one be regarded as "tech" and the others not? I have the same question when it comes to investing, where "technology" is identified as a sector (for example Personal Capital uses it as one of 7 sectors across which to balance its portfolios). How do you decide what companies fall in or out of that sector?