I was employed with employer A until sep 2011. I had an approved I140 with employer A. I changed to employer B and I got my H1 transferred and the duration was from sep 2011 - sep 2014. (My six years of h1b is complete in Feb 2012). The reason why I got H1b for 3 years with employer B is because of an approved I140 on file. After my H1b was approved employer A withdrew my I140.
My question is if I have a better offer from employer C, can i transfer my H1b to employer C. Would I still get my H1b until sep 2014. How risky is it now to transfer to employer C in my situation.Would by priority date be captured when a I140 is files either by employer B or employer C.