Well, you can't say "not including Shady", because neither Shady nor G-Unit Records are independent. Both are reliant on Aftermath, which is ultimately also dependent on Interscope.
Like 50 Cent, he's not JUST G-Unit. He's actually G-Unit/Shady/Aftermath.
Young Buck is G-Unit/Aftermath
Banks: G-Unit/Aftermath
Eminem: Shady/Aftermath
D12: Shady/Aftermath
Obie Trice: Shady/Aftermath
So you can say that Aftermath is home to all the above mentioned artists and in addition to those Olivia, DJ Green Lantern, Busta Rhymes, Eve and a few others who, lol, don't do anything.