Thailand’s long-awaited new Trade Competition Act B.E. 2560 (2017) (TCA) came into effect on October 5, 2017, and the legislation’s extensive reforms of both substantive and procedural rules from the preceding version of the law have been both effective and revolutionizing. Significantly, the TCA lays out an efficient structure for the Trade Competition Commission (TCC) and grants independence to its administrative office, the Office of Trade Competition Commission (OTCC). Consequently, enforcement of this law—which had been almost absent in the past 20 years—is picking up pace. This article will examine the ongoing developments under this law in recent years, and will highlight its current application by discussing some of the TCC’s latest guidelines. TCC: A Developer-Regulator Since its establishment in 2018, the TCC has proven that its role and responsibilities are beyond those of a conventional regulator and law enforcer. The OTCC, with the support of its ad hoc subcommittees, have been actively monitoring the conduct of business operators and the level of competition in various markets and sectors, and the commission is well recognized for its publicizing of the TCA and establishment of new regulations under the law. Through various channels and platforms, a series of regulations, reports on market conditions, press releases, rulings, and precautionary statements have been published, and the TCC’s spokesperson often appears in the media to educate the public. To streamline the exchange of information and collaboration, the TCC and the OTCC have entered into an MOU with six sectoral regulators, including the Securities and Exchange Commission of Thailand, the Office of Insurance Commission, and others. The TCC has also exercised its pre-emptive power to prevent suspicious trade practices and transactions. Prohibitive warnings have been issued against potential infringement, such as unfair trade practices by food delivery platform operators and a proposed merger by