1. Short title This Act may be cited as the Options Markets Stability Act . 2. Credit exposure for guarantees of centrally cleared options (a) Definitions In this section, the terms affiliate , appropriate Federal banking agency , depository institution , and depository institution holding company have the meanings given those terms, respectively, in section 3 of the Federal Deposit Insurance Act ( 12 U.S.C. 1813 ). (b) Treatment of certain centrally cleared option derivatives exposures For purposes of calculating the counterparty credit risk exposure of a depository institution, depository institution holding company, or affiliate thereof, to a client arising from a guarantee provided by the depository institution, depository institution holding company, or affiliate thereof to a central counterparty in respect of the client’s performance under a derivative contract cleared through that central counterparty pursuant to the risk-based and leverage-based capital rules applicable to depository institutions and depository institution holding companies under parts 3, 217, and 324 of title 12, Code of Federal Regulations, the term effective notional principal amount with respect to such centrally cleared derivative contract means the hypothetical on-balance sheet position in the underlying asset that would evidence the same change in fair value (measured in dollars) given a small change in the price of the underlying asset. (c) Calculation of exposure for centrally cleared derivatives For purposes of calculating the counterparty credit risk exposure of a depository institution, depository institution holding company, or affiliate thereof to a client arising from a guarantee provided by the depository institution, depository institution holding company, or affiliate thereof to a central counterparty in respect of the client’s performance under a derivative contract cleared through that central counterparty pursuant to the risk-based and leverage-based capital rules applicable to depository institutions and depository