Can I change multiple employers with I140

[esha sri]

Hi,
I would like to know the USCIS rules on the following situation 

Employer A - approved i140 for more than a year 
-> now moved to Employer B, let assume B did not file i140 or I wanted to change because I did not like the job after 3 months of employment with B
case 1) Employer B) may have started the Green card process
Case 2) Employer B) did not start the process at all

-> now moved to Employer C

questions:
1) Is it possible to switch to employer C in this scenario with i140 approval from employer A (please consider case 1 and case 2 with employer B)
2) in case of 2) during Employment with B, can B file unlimited extension or only first extension using Employer A i140 card is possible?

Appreciate help
Thanks

[pontevecchio]

As long as you have an approved I-140 for more than 6 months, you are entitled to further 3 year extensions beyond the initial total of 6 till the Pd of that I-140 is current even if the I-140 is subsequently revoked.

 

[prasony]

On 2/10/2019 at 10:30 AM, pontevecchio said:

As long as you have an approved I-140 for more than 6 months, you are entitled to further 3 year extensions beyond the initial total of 6 till the Pd of that I-140 is current even if the I-140 is subsequently revoked.

  

Can we apply H4 EAD to a spouse based on withdrawn i-140?