Ok, so you have documented $15m+$8m =$23m value. They have spent $2m p.a. over how many years? An equitable price for your solution should be in the 15%-30% ra

Ok, so you have documented $15m+$8m =$23m value. They have spent $2m p.a. over how many years? An equitable price for your solution should be in the 15%-30% range of those savings. Hope you haven't said too much. Effective negotiation involves managing information and expectations very well. An experienced negotiator could be expected to extract a $3+m lump sum payment. So even if you paid the negotiator 30% for their services you'd walk away with at least $2m. My recommendation would be to quickly find a lawyer/negotiator who is interested in making a cool $1m for professional services rendered on a contingency basis.