No Title
You definitely don\'t need to refile 485. As per current regulations, you would be required to file an amended 140 showing that this takeover satisfies successor-in-interest requriements. However, a lot of people feel that once INS issues AC21 interpretation, you may not be required to do even that. This is so because AC21 allows you to switch jobs after 6 months as long as the new job is similar.
I suggest you go ahead and spend the $200-300 to file 140 to be on the safe side since your company was acquired before you had 6 months on 485. Ask your company to pay for it.