I’m trying to remember, why do some form two business entities? One to own the trading account while the other entity manages the account.
That is one of several "purposes", but not necessarily reasons. The exact business, income, profit, and other factors, even geography, play into the reasoning and purposefulness. In some cases, the same outcome (such as in your cite) can be achieved via a single entity structure. A multiple entity structure IMO, based on my circumstances, would be for one or two reasons... 1) C-Corps have access to MORE benefits. Some of those benefits, for example, medical expense reimbursements, I have no interest in. Existing S-Corp benefits work fine for me and my family. 2) Transfer of income... C-Corps have lower tax rates than individuals. C-Corps, unlike pass-though entities, also have retained earnings. Dividends however, have double taxation. Again, there are many purposes for multi-entity structures, but no one-size fits all... determined case by case.
i want to make sure that you know what are you doing. When i was in the same situation my colleague told me to not rush and start reading IncFile LLC review to create something special. Last year when i thought that it is the time to start LLC i thought that i knew all that i need and thanks to my colleague i realized that i don’t know as much as i need. Now my company doing step by step to the stars. Nothing can stop us we are all the way up. If you think that you know everything that is not true. We are just humans we all can do mistakes.