When I prepare to negotiate an agreement for a client, I start by researching the other party so I can gain insights that might help me represent my client more effectively. The obvious starting point is the website for the other party, where I can quickly understand its business and see who its executives are. But I also look for legal information that typically is available only elsewhere.
Every state has a searchable database of the businesses that have registered with that state, either because the business was formed there or because it was formed elsewhere and registered to do business in the state. Each state includes in its database, at a minimum, information about the corporations and limited liability companies. Most states include information about other types of business entities, too.