Sumário:Arbitration confidentiality and disclosure duties on the Brazilian legal framework: mandatory arbitration and confidentiality; arbitration and the disclosure regulation; confidentiality versus disclosure duties : the CVM standing -- Some empirical evidence of the ineffectiveness of the disclosure duties -- Preliminary remarks -- Consequences of confidentiality of arbitration in publicly traded companies: private consequences of confidentiality : prevention from exercising procedure rights and the impossibility of class arbitration system; public consequences of the confidentiality.