Over here you will find free vector brand logos in Illustrator, EPS, Corel Draw format..

Brand Vector Logos start with 'X' letter

XV de Novembro Esporte Clube de Uberlandia-MG
Xunta De Galicia
XT ScreenWash
XT BrakeDot
XT AntiFreeze
Xtria
Xtreme III
XTreme FX
Xtreme 1
Xtreme
XtraSpace Design