Corporate Filings are filed/listed in state of incorporation, and are also registered in foreign states (other states) where they are doing business.
Corporate Agents: Can be an officer/employee of the corporation, sometimes is the company attorney, and often is a Trust Company acting as an "Agent" that simply manages making sure that all the red tape government forms are filled out, including the annual renewal of the corporate filings.
Also the place where you would serve legal notices, serve subpoenas etc.
Agent Trust companies can provide all kinds of services to the corporation., including things like disbursing dividends to shareholders.
"Agents" have many multiples of customers. That's how they make their earnings.
Some of the corporations for The Corporation Trust Company are marked "inactive" - no longer in business, or for some reason is failing to file their annual corporate returns keeping the company "active".
When doing a search for corporate officers, agents are also displayed.