Stock broker duties require prompt execution, client notice, timely settlement, confidentiality and prohibition on churning. Stock brokers must promptly execute client orders, inform clients of execution or non execution, make payment or deliver securities within Board specified timelines, and issue contract notes in the prescribed form within specified timelines. Brokers must keep client investment information confidential, must not encourage trades solely to generate brokerage, must not provide false or misleading quotations or advice to solicit business, and must not execute orders for clients who have failed to meet commitments with another broker.