Section 23.701 - Notification of right to segregation(a) At the beginning of the first swap transaction that provides for the exchange of Initial Margin, a swap dealer or major swap participant must notify the counterparty that the counterparty has the right to require that any Initial Margin the counterparty provides in connection with such transaction be segregated in accordance with §§ 23.702 and 23.703 , except in those circumstances where segregation is mandatory pursuant to § 23.157 or rules adopted by the prudential regulators pursuant to section 4s(e)(2)(A) of the Act.(b) The right referred to in paragraph (a) of this section does not extend to Variation Margin.(c) If the counterparty elects to segregate Initial Margin, the terms of segregation shall be established by written agreement.(d) A counterparty's election, if applicable, to require segregation of Initial Margin or not to require such segregation, may be changed at the discretion of the counterparty upon written notice delivered to the swap dealer or major swap participant, which changed election shall be applicable to all swaps entered into between the parties after such delivery. 78 FR 66636 , 11/6/2013, as amended at 81 FR 704 , 1/6/2016; 84 FR 12905 , 5/3/2019