Bank of Indonesia has launched the fifth edition of the Market Code of Conduct (MCoC), also known as the Brown Book Edition V, positioning it as the main reference for standards of market ethics for Indonesia’s financial market participants. The central bank framed the updated code as supporting market credibility, pricing efficiency and investor confidence, and as a tool to mitigate risks arising from ethical violations or departures from professional standards. The MCoC Edition V is the first national code to incorporate the 2026 edition of the Association Cambiste Internationale - Financial Markets Association (ACI FMA) Handbook into domestic standards, alongside the 2024 edition of the FX Global Code. The ACI FMA Handbook covers principles on market practices, personal conduct, operational readiness, and the use of technology and security to promote ethical, transparent and secure transactions. The code was launched in Jakarta on 15 April in collaboration with the Indonesian Money Market and Foreign Exchange Market Association (APUVINDO) and ACI FMA Indonesia, with Bank of Indonesia urging consistent implementation by market participants and linking the initiative to the 2030 Blueprint for the Deepening of the Money Market and Foreign Exchange Markets (BPPU 2030).