Can my employer withdraw I-485 without my knowledge?

I don\'t think so.

Your employer can not withdraw 485 as it is filed by you. But they can withdraw I-140 invalidating 485 petition.
But don\'t worry, your company has no reason to withdraw I-140 as it was a layoff.

NOTE: The information provided above was read from some of the immigration related sites and may not be accurate.
 
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