 It is quite common for members of a company to supplement the corporate constitution with additional arrangements, such as "shareholders' agreements", whereby they agree to exercise their membership rights in a certain way.Conceptually a shareholders' agreement fulfills many of the same functions as the corporate constitution, but because it is a contract, it will not normally bind new members of the company unless they accede to it somehow.One benefit of shareholders' agreement is that they will usually be confidential, as most jurisdictions do not require shareholders' agreements to be publicly filed.