Should I engage a business broker or M&A professional to sell my business, or should I go at it alone?

Our firm is agnostic as to how a business owner exits their business.  The mission is designing and implementing a plan for the exit route (sale to a third party, sale to insiders, transfer to children, ESOP, absentee owner) that will give the owner the best opportunity to attain all their goals (financial, values-based, legacy).  That’s a key value-add when engaging our firm.