When there are two or more equity holders, a Buy-Sell Agreement is a powerful tool to help control a company’s future.  Contractually determining what happens to the company stock after a triggering event (termination of employment, disability, death, third party offers) can avoid shareholder disputes and can also solve some of the owners’ estate planning problems.  While no single, sure-fire method of determining the price exists, having a well thought out formula and contractual obligation to regularly update the valuation of the stock price is essential.