S.I. No. 375/2017 transposes MiFID II and related delegated acts into Irish law. It establishes authorisation and operating conditions for investment firms, MTFs/OTFs and regulated markets and for data reporting services (APAs/CTPs/ARMs). The instrument sets detailed organisational and conduct requirements (governance, conflicts of interest, product governance, suitability and appropriateness, client asset safeguarding, inducements, algorithmic and high‑frequency trading controls, direct electronic access, market‑making and transparency) and position limits for commodity derivatives.

The Central Bank is designated competent authority with extensive supervisory, investigatory and sanctioning powers (on‑site inspections, directions, withdrawal of authorisations and fines). Provisions cover tied agents, third‑country branches, cooperation with ESMA and other authorities, notification and appeal procedures, publication of decisions and transitional measures.