^Not SpaceX. In fact, I can't think of any company that is. Who are you thinking of?
Despite it's name, the Falcon Heavy is not a "heavy" launcher. "Heavy" is generally applied to a launcher that can get in excess of 70 metric tons to orbit. Falcon Heavy is only projected for 53 metric tons.
Don't be nitpicky. But if you want to play it that way, many don't even consider 70 mt to be heavy - heavy has traditionally been considered to be 100 mT or more.
And compared to the most capable launcher currently in the world - the Delta IV-Heavy at 25 mT - it sure is 'heavy'.