H1B unused unstamped expired petition transfer

[deendayalrajak]

I work for Company A in India and they Filed H1B for me. Its approved.Petition has validity from 1 Oct 2015 to 30 Sep 2016 .Now petition is expired. I have the soft copy of approved H1B petition(I797). Stamping is not yet done, so not entered in US yet.

I got offer from Company B in India.
1.Can company B transfer my unstamped unused existing H1B petition?
2.Will it come under CAP limit or CAP Exemption.
3.Is there are any issue to file H1B petition in cap exemption quota
4. What are risk for company B or employe for H1B stamping