Gets reinjected in a special fund that the EU can then use where they want. It's usually just injected in the central budget, to reduce the contribution each member country has to pay.

And contrary to popular opinion this fund is on the order of 0.1 percent of the EU budget. I've heard the "omg, the EU runs on American corporations' money" thing a little too often.

And indeed the converse happens often enough; Credit Suisse, RBS, Barclays and UBS have paid large fines (multi billion) to the US over the last few years.