That's true only for a very narrow definition of "tech". If I were to redefine "tech" to only include Formula-1 racing teams and constructors, then suddenly none of the top tech companies are from the US.
Am I right to assume you have never heard of companies like ASML, Spotify, Booking.com, Just Eat (takeaway.com), or Adyen?
And finally, large US companies use their capital to buy out European firms to keep pretending that all "tech" is home-grown. Skype, Nokia, ARM, NXP, SkyScanner, Shazam and Minecraft all started out in Europe.