1. Go to Commonwealth of Massachusetts - Corporate Directory Filings: https://corp.sec.state.ma.us/corp/corpsearch/CorpSearchEntityList.asp?ReadFromDB=True&UpdateAllowed
2. Enter Last Name "Romney" in the "Search by individual" option and click on "Search"
3. Scroll through the list of results until you see Bain Capital, Inc. (in the 4th column) and click on the name.
Now: the fact that Mitt Romney is still listed as "President" of this company may or may not mean anything.
Maybe this isn't even the "Bain" that is starring in the Batman movie.
But it is interesting, yes?