Northdata [1] does basically this, but mostly ingests European data currently. Perhaps they will expand to ingest US data as well at some point. Not affiliated with them in any way. I just use them to look into company structures every now and again.
I worked on a knowledge graph map using Wikidata to get relationship between people and organizations, but data was limited to family, basic stuff. Being from Europe, there isn't an open data analogue of SEC. Now I will download this data, it is open so no license at all, and try to show these kind of relationships. It has the potential of being very investigative, especially for USA residents.
Each european countries has various orgs, types of license. It is easier to start from SEC to integrate that data into my site, also you have to test a bit what users care about.
Wondering aloud -- this is clearly PII, but it's public information. The site would be subject to GDPR, and other rules from the EU, and folks may want to have their data hidden or removed. What would be the exposure for sourcing EU data?
Is it that? Or would it be similar to when you have a lot of responsibility (like leading a company) you tend to bring along people you know you can trust and can help you succeed?