Did everything change so nothing changes? Argentina’s merger control system was substantially reformed in May 2018. Since then, that question resonates insistently: did everything change so that nothing changes? The new Competition Law 27,442 (LDC) established in 2018 a real pre-merger control system, in order to properly align the incentives and objectives of this type of control. Unfortunately, the LDC established a transition period that will last up to one year after the coming into operation of the new National Competition Authority (ANC). As long as the transition period lasts, Argentina will continue to have an ex post control system that, as a result of some regulation of the law that violates the spirit of the LDC, will also probably be the most ex post system of all the merger control systems in the antitrust world. The ANC, as at the date of writing, has not been designated. Everything is yet to be seen.