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说是三年前我的I-140是在公司A的名下申请的，后来公司与另一家合并改名成B，但我的工作从没有任何改动。律师说，要重新做PERM，这下复杂了！请问，一定要重新做PERM吗？再排期三年？

-It seems this lawyer is not experienced. Your current employer does not need to file a new PERM because this new/merged company is the successor-in-interest for the old company. So, your current employer (the successor-in-interest petitioner) just need to file the I-140 amendment to take over the approved I-140 and the rights and liabilities of your old employer (old I-140 petitioner). You can file I-485 concurrently with the I-140 amendment if your priority date is current. Discuss my opinion with your lawyer or find another experienced lawyer to help you out.

See this USCIS Memo for successor-in-interest:

https://immigration.com/sites/default/files/Successor-in-Interest-8-6-09.pdf

Also see this article:

https://www.usavisanow.com/perm/perm-faq/successor-in-interest/