The most clear and objective way to compare corporations is market capitalization, and the seven corporations with the biggest market cap in the world are all tech companies.[1]

How powerful a company is a bit harder to judge, but if anything tech companies punch above their weight when it comes to political power. Johnson & Johnson has ten times the market cap of twitter, but much less political power.

[1]: https://en.wikipedia.org/wiki/List_of_public_corporations_by...