Aisin AW (formerly Aisin-Warner) manufactures the best and most reliable automatic transmissions in the world. Aisin AW is majority owned by Toyota and supplies all of Toyota's automatic transmissions.
Aisin AW is the largest automatic transmission manufacturer in the world and supplies automatic transmissions to 55 automotive manufacturers around the world, virtually every major OEM. These include General Motors, Ford, Chrysler, Mitsubishi, Nissan, Porsche, Saab, Audi, VW, Volvo, Fiat, Alfa Romeo, Peugeot, Hyundai/Kia, and Suzuki (among others). Honda excluded.
Honda designs and manufactures their own automatics. Over the years, Honda's automatics have had a spotty reliability record.