a written grant by a country's legislative or sovereign power, by which a body such as a company, college, or city is founded and its rights and privileges defined. "the town received a charter from the Emperor"
The legislative process for a charter says otherwise. We, the people, define what the government is and by extension what the rights a company has. The fact that states don't enforce the revocation of a company's charter doesn't mean that the power, given by the people, to the government doesn't exist.
Analytic jurisprudence (which is what I think you are talking about) is something that people think is more important (a belief, codified in law) than Natural Law. But Common Law, derives from Natural Law and it still has a place in this area of focus even though people believe that it doesn't, or it shouldn't. The actual harms in society are caused by the belief that laws can be legislated though power dynamics. Analytic jurisprudence cannot contend with the idea that all law, stems from natural law, and when you deviate from it, it cause harms for society. Plus it's at the whim of people in power. Just because it happens, doesn't make it right or required.