Investing "parked" SDIRA Funds

I have funds “parked” at Titan Bank as I evaluate potential real estate investments. Titan Bank doesn’t have the best investment selections while my money is parked there so, I’m looking for alternative places to park the funds.

Could you provide references to custodians (Schwab, etc.) that are accepting SDIRA funds to invest in stocks / indexes and, how the account would need to be setup (business account in the name of the LLC).