In 2017, the Singapore International Arbitration Centre (SIAC) released separate rules for investment arbitration: the SIAC Investment Arbitration Rules (SIAC IA Rules). This chapter addresses the new SIAC IA Rules, which entered into force on 1 January 2017. It begins in Part A with an introduction to the SIAC IA Rules. Part B then examines the key provisions of the SIAC IA Rules in more detail. These include scope of application (Rule 1), constitution of the tribunal (Rules 5 to 9, 12, 13), third-party funding (Rules 24, 33 and 35), early dismissal of claims and defences (Rule 26), third party intervention (Rule 29), and confidentiality and transparency (Rules 37 and 38).