Am I required to sign any agreement with the broker or sub-broker?

Yes. For the purpose of engaging a broker to execute trades on your behalf from time to time and furnish details relating to yourself for enabling the broker to maintain client registration form you have to sign the "Member - Client agreement" if you are dealing directly with a broker. In case you are dealing through a sub-broker then you have to sign a "Broker - Sub broker - Client Tripartite Agreement". Model Tripartite Agreement between Broker-Sub broker and Clients is applicable only for the cash segment. The Model Agreement has to be executed on the non-judicial stamp paper. The Agreement contains clauses defining the rights and responsibility of Client vis-à-vis broker/ sub broker. The documents prescribed are model formats. The stock exchanges/stock broker may incorporate any additional clauses in these documents provided these are not in conflict with any of the clauses in the model document, as also the Rules, Regulations, Articles, Byelaws, circulars, directives and guidelines.