Sachingp,
I have been through the same process. My company was acquired during the I140 process. My company (of through the lawyer) filed for an amendment, which is a simple process of filing the certificate of merger/acquisition. To be on the safe side my lawyer also filed the financials of the other company with which my company merged. In my case the I140 approval, despite all this, is in the the name of the old company. I am carrying enough documentation (like copies of all the material that was sent out to USCIS for them to make a note of the merger) along with me for CP.