It depends on the legal name of the company. You need to see how the name of the entity is filed with the secretary of state in which the entity is created. The legal name is also filed on the IRS form 8832 Entity Classification Election. It is the legal name of the entity, not grammar or usage. Most LLC names I have seen do not have a comma before them.
Business owners register LLCs with state, rather than federal, agencies, so LLC naming requirements vary somewhat from state to state. There is no state that requires the use of a comma in the name.
before
No, a comma is not necessary.
no
You would use a comma before it. Xerox, Inc.
if the main or most important part is before the main parts you use a comma, but if it is after then no comma
Yes, you can put a comma before except. Example of a comma before except in a sentence- She can do it, except that the mountain is too steep
no
No
no
You do not use a comma before III, or before any Roman Numeral, if it is part of a name such as King George III.
I do not use a comma before and after that word, therefore you will not see it in any sentence I have written.