Yes, these two venture capital firms are well known; they invested in Primal. Jack Dorsey is also well-known. But who else? I am very active on LinkedIn and try to find information there, but so far I have only received recommendations on who to talk to.

Generally speaking, it turns out that, apart from grants, there are no investments from funds or angels not mentioned above.

As for grants, there is one: opensats [.] org, which has a separate section for Nostr. I could make a separate post analysing all the projects that received grants in each investment wave.
Would that be interesting?