B3 has implemented a change to the “expiration code” field in the shortened version of the BVBG.031 (DailyFeeUnitCostReport) file, which is used to inform market participants about the unit costs of fees applicable to trades. From now on, the shortened version, sent to options markets 3 and 4, will only include the month code and the year code, thus reducing the file size. Previously, this field also contained the option type and an alphanumeric sequence. This change was made to accommodate clients who were experiencing difficulties with the current file size.