A company which submits registration information to the Agency on behalf of other members of a joint registration. The information submitted by the lead registrant concerns classification and labelling, study summaries, test proposals and, if necessary, indication which of the information was reviewed by an assessor. If the members of the joint registration so decide, the lead registrant may also submit information on safe use and the CSR on behalf of the others. After the lead registrant submits the information, the other members of the joint registration submit the remaining information individually.