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Execution Quality

CHX presents order execution quality information pursuant to Rule 605 of Regulation NMS. Under this SEC rule, all market centers are required to provide order execution quality information on a stock-by-stock basis.

The structure of the relevant data files is explained in the following: Appendix A – Text of Joint-SRO Plan from the SEC.

To download execution quality reports for a particular month, click on the file to the right that interests you. There are two files for each month, a data file and a key to the market centers used in the data file. All files are zipped using standard compression. The data file, when uncompressed, is a pipe-delimited ASCII file. The data files are named in the SEC-mandated method: "m", followed by the year, and then the month.

For execution quality reports from prior months, please refer to the following directory:

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