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

Brand Vector Logos start with 'I' letter

iStar Design Bureau
IHEA
Impresol Tulancingo
iKnow Solutions
Isopan
Instituto Telesup
Insign by Jochem
Illustrator by Spectrum Noir
Institute of Integrated Electrical Engineers
Invias
Invias