What does "investor" title mean on linkedin?

Some people on linkedin lists under Experience :

[Xyz company] Investor.
Full time. 2 years 1 month

[Abc company] Shareholder
Full time. 3 years 4 month

Etc ...

I saw a couple of them. What does that mean?

Surely, it doesn't mean they just invest and take vacation? It's listed as full-time and they don't have concurrent jobs?