The Securities and Exchange Commission recently approved the Municipal Securities Rulemaking Board rule proposals governing the conduct of brokerʼs brokers. The new rules consist of (a) new MSRB Rule G-43 governing the municipal securities activities of brokerʼs brokers and certain alternative trading systems; (b) amendments to MSRB Rules G-8, G-9, and G-18 concerning recordkeeping, record retention, and agency trades by brokerʼs brokers; and (c) interpretive notice on the duties of dealers that use the services of brokerʼs brokers. The new rule, amendments, and interpretive notice become effective on December 22, 2012.