Market Regulation Services Inc. is seeking comment on proposed changes to its trading rules regarding short sales and failed trades.

Among other things, the proposed amendments would repeal all restrictions on the price at which a short sale may be made; eliminate the requirement to file “short position reports” in certain circumstances; define a “failed trade”; and impose various regulatory reporting requirements.

The proposed amendments will take effect once they receive approval from the provincial regulators, following public notice and comment, and upon ratification of the changes by the board. However, it notes that the implementation of certain amendments would be deferred to permit changes in the systems and procedures of various market participants.

Comments are due by October 9.