Corporations can be held liable and punished, they can be forced to declare bankruptcy and forced to dissolve. I would call that execution.
The entire purpose of Corporate Personhood is to apply these disadvantageous purposes to a corporate entity. It is also to limit liability on the stakeholders, so that if you start a company, and the company goes south, your creditors can't destroy your life by taking all of your personal assets.
But when there is actual criminal activity, the liability protection of the corporation can be completely ignored and individual bad actors can be pursued in the courts. This is called "Piercing the corporate veil"[0].
Legal personhood is a legal fiction that has been granted to innumerous "entities" including the environment itself (see, for example, the Ganges River's personhood[1]. Furthermore, it does not grant full personhood for obvious reasons. A legal person cannot vote or be represented in government.
I'm a liberal democrat, but god do these "Corporations aren't people" memes make me cringe. Things like limited liability and corporate personhood not only allow for incredible economic growth through financial innovation, but also provide benefit to individuals harmed by the corporation. If a corporation didn't have legal personhood, how else could a victim sue the entity and receive a settlement? The only "people" they could sue would be individual stakeholders.
[0]: https://en.wikipedia.org/wiki/Piercing_the_corporate_veil
[1]: https://en.wikipedia.org/wiki/Legal_person#Examples