This paper assesses implementation of the International Organization of Securities Commissions' (IOSCO) objectives and principles of securities regulation in Spain. Spain exhibits a high level of implementation of principles. The legal framework is robust and provides the Comisión Nacional de Valores (CNMV) with broad supervisory, investigative, and enforcement powers. Arrangements for off-site monitoring of regulated entities are robust. However, some areas of supervision and enforcement require strengthening. In particular, the CNMV should make more use of on-site inspections for all types of investment service providers.