I've heard it from a friend working at one that it's 0.5-2% of a deal (the bigger the deal the smaller the cut), and here's a Quora discussion that corroborates

I've heard it from a friend working at one that it's 0.5-2% of a deal (the bigger the deal the smaller the cut), and here's a Quora discussion that corroborates that figure [0]. [0]: https://www.quora.com/What-is-a-typical-M-A-fee-for-an-acquisition-worth-50-million-500-million-5-billion https://www.quora.com/What-is-a-typical-M-A-fee-for-an-acqui...