Why do you think it's any of the employees that are at fault, even the c-levels?
Fine the investors. Everyone who owned a share when the violation occurred takes a lick.
If you go after c-levels, what will happen is they'll devise some sort of time deferred compensation avoids the penalties you want to impose. The board needs a CEO after all, and CEOs are reluctant to run a company if they know they'll just have their paycheck confiscated.