Approvel for Labour for Company B?

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My I140 approved with company A and got extension till 2020 and I moving to Company B.Company B filed my visa and i got 1 year extension til april 2018 .so i got

extentsion from 4/2017 to 4/2018. and my H1B 6 years completing in July 2018.

so my question is that , is it safe to change job with 1 year extension , so i have to apply for labour again and then i can get extension or i can get extension with

I140 which is filed by Compant A.



swati