Regulators act as “market referees”, balancing often competing interests of stakeholders, including governments, current and future actors in the markets, and consumers. At the same time, markets are changing at an unprecedented pace due to new technologies, the international drive toward carbon-neutral economies, shifts in consumer needs and preferences, and, more recently, the profound changes brought by the COVID-19 pandemic. Assessing the performance of economic regulators must therefore be a continuous effort. This progress review evaluates the changes put in place by Peru’s telecommunications regulator, OSIPTEL, since the previous OECD performance assessment review in 2018, in the interest of increasing the effectiveness of its regulatory activities and improving final outcomes for consumers and the economy.