Article is dedicated to the scientific research of notarial protection and defence of the civil legal aspects of corporate rights of founder’s (participant’s) of Limited Liability Company. Author analyses legal notions of limited liability Company, procedure of its foundation and peculiarities of constituent documents. Separate attention is paid to the constitutive agreement. It is proposed to consider notarial form of protection as extrajudicial and considered to be a legal state guarantee of business participants’ corporate rights and interests ensuring. In a conclusions author proposes some fills in to Law of Ukraine «Under state registration of juridical persons, physical persons-entrepreneurs and public formations», Civil code of Ukraine and Law of Ukraine «Under notariate».