Have a Petation of H1b which i got in 2015, is the petation number is enough to transfer

HI Team,

My company has proceed my H1b during 2015, after that I have received Petition Number. Now I am changing the company, I would like to what kind of things we request from the company for H1b Visa.

As of now company is planning to give Petition number, is this enough ?

Vishy