Within ten seconds of searching my memory I can think of at least three Israeli companies that are known for researching/hoarding secret zero days and making use of them for large sums of money. Cellebrite, NSO, and Elbit.

https://www.forbes.com/sites/thomasbrewster/2016/08/25/every...

Elbit is a big defense contractor and basically wants to simultaneously be a competitor of General Dynamics and Palantir.