I have a question regarding H1B Transfer. Suppose an individual is being sponsored for H1B from company "A"(for the first time,.. before that individual was in F1 status) and  his application is send to USCIS. The process is pending and still not approved by USCIS.  Before having the conformation of H1B, he wants to switch to another company "B". Is it possible to switch the employer in between the H1B filing process i.e before H1B being approved. 

Any information on this would be greatly appreciated. 

Thanks,

tuktuk