In it's second weekend of release the battling robots took $36,400,000 and has now grossed $174,746,000 over it's 10 day run so far.
Not content with making a big slash in the US it has made nearly $400 million worldwide and is still to open in many countries including the UK where it's released this Friday.
Highest new film of the week is Melissa McCarthy in Tammy, opening with a gross of $21.2 million, thats $15 million behind Transformers.
Other new film on the US box office - Deliver Us from Evil at 3 - Earth to Echo at 6
Check out the US box office