Yahoo, Compuserve, AOL, Gateway Computers, Nokia, SEGA, Blockbuster, KMart, and countless more medium-large business that didn't have a strategy for the technology shift.
That's not the question was asked though. Sure, they were an industry leader in the 70s/80s but in the period 1990-2005? It's hard to claim they really were. It's one of the rare examples of a fallen giant getting back on their feet, most just slowly dissolve over a few decades. AT&T is the only other such example that comes to mind.
> AT&T is the only other such example that comes to mind.
If you're talking about the current AT&T, then I'd argue it's not a great example. The relationship between old AT&T and the company currently calling itself AT&T is tenuous. It would be more accurate to say the brand name survived, because it has good name recognition value.
Yahoo was more of a slow decline, and missed opportunities. They could have actually acquired Google and/or Facebook at one point, and could have been acquired by Microsoft at a later point.
The comment talks about "quickly changes the world around us rather fundamentally", "knocked off their perch", and "within a few years", which doesn't seem like an accurate description of what happened with Yahoo.
But anyway, they didn't specify all industry leaders, and it's pretty solid that many leaders were knocked off their perches.