On August 7th, the SEC provided notice of the Chicago Mercantile Exchange's filing of a proposed rule change relating to the liquidity factor of its credit default swap margin methodology. The proposal would change the methodology used for the Duration/Series/Tenor ("DST") factor of the CDX IG and HY families. Under current methods, every DST calculation is calibrated separately for each index family and the maximum DST value is used. The proposal would change the DST factor so that it would apply to the specific series and tenor for each CDX IG and CDX HY CDS contract in a portfolio. The revision is designed to more closely align the DST factor with the liquidity profile of the CDS contracts in a portfolio. Comments should be submitted within 21 days after publication in the Federal Register, which is expected during the week of August 13. SEC Release No. 34-67610.