The Spanish Securities Commission (CNMV) has published a guide on “Digital persuasion for investors” explaining how investment platforms, apps and websites use digital techniques to influence investor behaviour, and setting out practical strategies to mitigate their impact on decision-making. The guide describes “Digital Engagement Practices” as design- and technology-driven techniques, often fuelled by data collected through user interactions, that capture attention and steer users towards certain choices. It contrasts traditional persuasion with newer, more sophisticated and personalised digital methods, and highlights common tactics such as drip pricing, sludge (added friction to deter actions such as cancelling an account or withdrawing funds), framing and scarcity claims. It also recommends steps for investing with greater discipline in digital environments, including using only registered platforms, understanding products, risks and total costs, avoiding decisions under pressure, comparing alternatives, identifying gamification features, limiting notifications, and being mindful of personal data use. The publication forms part of the CNMV’s investor education work and sits alongside other educational resources available on its website.