Over the last four decades, many corporations from Western countries have chosen to relocate several of their activities in developing countries. As a consequence, many host countries took the decision to loosen their regulations to attract Western companies and foreign investors. This has led to what is commonly known as the “race to the bottom,” which describes the pursuit of many countries seeking to attract foreign capitals on their territory by reducing their social and environmental standards. In the context of these movements of capitals, governments of Western States have sought to ensure the fair treatment of their corporations in their operations abroad through the conclusion of trade and investment treaties. These treaties award protection to investors and entitle them to enforce their rights with respect to the host State before arbitral tribunals. Such international investment agreements generally do not place obligations on investors, but only on the State Parties. While corporations and private investors have accumulated a certain number of rights under these treaties, a certain asymmetry has developed with regards to their accountability towards the countries and populations affected by the adverse impacts generated by their activities. Several abuses by transnational corporations have revealed the importance of bringing more balance to State-investors treaties, and underlined the necessity to impose sustainable development obligations to transnational companies and investors. This article aims at discussing the necessity of including corporate social responsibility considerations in the international investment treaties framework. We shall notably discuss the latest developments in that respect in recent investment treaties. We shall also assess the adequacy of arbitral tribunals to handle corporate human rights breaches and analyze what mechanisms could be adopted in order to broaden the scope of arbitration and to develop new mechanisms to put an end to the State-investor asymmetry.