Almost all her stock holdings are of RealNetworks, a company she worked for in the 90s and that has been on the decline since the Dotcom bust: https://en.wikipedia.org/wiki/Maria_Cantwell

Woah, it lost 99.99% of its value since 1999. She really ate enormous losses .

Also what is RealNetworks even selling at this point? They seem to have generated 175m$ last year!

Facial recognition, apparently: https://safr.com/

TIL RealNetworks still exists.