On H1B Extension - is extension possible by new Employer

[rajamuna0319]

I had a I140 approved through Employer A in the month of June 2015. Moved to Employer B using the approved I140 by H1b Extension. Got an extension till DEC 2019. Employer B has not started the GC process yet. Now, I am intending to move to Employer C, can the Employer C file a H1B Extension based on the approved I140 (by Employer A) as it is more than 180 Days when my I140 was approved through Employer A ? Please comment/suggest.