For public companies, it is extremely easy. Just start off with a warning every time certain filing (Section 13) is made. You could conceivably do this automate

For public companies, it is extremely easy. Just start off with a warning every time certain filing (Section 13) is made. You could conceivably do this automated. For private, large companies, its a simply attestation. You could open source monitoring for changes - if the company makes an PR announcement of any kind , or if a member of the public reports submits proof of change of control exercise in their contract, ask the company to update their attestation and compare. They don't provide it ? They get a nice little red banner alerting users of shadiness going on.