Is stamping reqd to transfer H1B from one company to another

aditya.soni83

New Member
I am currently working in company A and have my H1B visa approval for company A. My H1B petition was done under change of status. My status will change from F1 to H1B on October 2008.I have the following questions:

1. Can I change to company B after October without getting the visa stamping done for company A?

2. Do I need to go out of US and re-enter to get H1B stamping done before I change the firm to be on a safe side?

3. If not stamped, can Company A cancel my H1B?

Thanks
Aditya
 
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