See the URL below for a complete list of DEXRON-VI approved ATFs. Be sure to look at all 3 categories; Original approvals, reblend approvals, and rebrand approvals. The rebrands are the largest list and so are listed separately. Overall, there are over 100 licensed products.
http://www.gmpowertrain.com/VehicleEngines/DEXRON-VI.aspx
http://www.gmpowertrain.com/VehicleEngines/DEXRON-VI.aspx