The PRU Rulebook stands for the Prudential – Investment, Insurance Intermediation and Banking Rulebook. It is issued by the Financial Services Act (FSA) and sets out the prudential requirements for most authorized financial institutions operating in or from GMC. The PRU Rulebook applies to licensed firms in GMC, other than insurers, representative offices, and credit rating agencies, which are covered by separate rulebooks.

The rulebook covers areas including: Application and categorization of firms. Capital adequacy and capital calculations. Credit risk. Market risk. Operational risk. Interest rate risk in the banking book. Group risk. Liquidity risk. Supervisory review and evaluation. Disclosure requirements.