Regarding COMPACTS ... here's what I know regarding current tractor production (last time I checked).
Manufacturers selling as their own:
Kubota (Japan) - Makes/sells their own.
Daedong (S Korea) - Makes their own, sells as Kioti.
LS Mtron (S Korea) - Makes/sells their own.
Yanmar (Japan) - Makes/sells their own.
TYM "Tong Yang Moolsan" (S Korea) - Makes/sells their own.
Kukje Mfg (S Korea) - Makes their own, sells as Branson.
Mahindra (India) - Makes/sells SOME of their own.
Deere (US) - Apparently currently makes/sells their own.
Mitsubishi (Japan) - Makes their own, BUT not sold in US as Mitsubishi.
Iseki Mfg (Japan) - Makes their own, BUT not sold in US as Iseki.
Companies selling tractors built by someone else:
New Holland - LS makes nearly all of them.
Case - LS makes them.
Massey Ferguson (Parent AGCO) - All compacts (and most machines under 100 HP) made by Iseki Mfg.
McCormick - Currently, compacts built by Kukje Mfg (previously built by LS and Daedong).
Cabellas - Built by TYM.
Mahindra - Compacts built by TYM, Mitsubishi, and a few by themselves.
Bobcat - Compacts built by Daedong (no longer offered, deal expired).
... I think that's everybody.