The Securities and Exchange Commission ("SEC" or "Commission") is adopting final rules requiring the application of specific risk mitigation techniques to portfolios of uncleared security-based swaps. In particular, these final rules establish requirements for each registered security-based swap dealer ("SBS dealer") and each registered major security-based swap participant ("major SBS participant") (each SBS dealer and each major SBS participant hereafter referred to as an "SBS Entity" and together referred to as "SBS Entities") with respect to, among other things, reconciling outstanding security-based swaps with applicable counterparties on a periodic basis, engaging in certain forms of portfolio compression exercises, as appropriate, and executing written security-based swap trading relationship documentation with each of its counterparties prior to, or contemporaneously with, executing a security-based swap transaction. In addition, the Commission is issuing an interpretation addressing the application of the portfolio reconciliation, portfolio compression, and trading relationship documentation requirements to cross-border security-based swap activities and is amending its regulations to address the potential availability of substituted compliance in connection with those requirements. Lastly, the final rules include corresponding amendments to the recordkeeping, reporting, and notification requirements applicable to SBS Entities.