China's State Administration for Market Regulation ("SAMR") recently released three new antitrust regulations that consolidate the antimonopoly regulations of its predecessor antimonopoly enforcement agencies, but also introduce important changes. This Jones Day White Paper reviews the key reforms, which take effect September 1, 2019, and their implications for companies doing business in China. Although the new regulations largely restate existing law, some new rules provide welcome clarity and transparency to underdeveloped legal principles. In some cases, the new rules foreshadow more enforcement and signal new areas for SAMR's focus. In other circumstances, the rules expand defenses available to companies faced with a SAMR investigation.