Clean sweep: Informed trading through intermarket sweep orders


An intermarket sweep order (ISO) is a limit order that automatically executes in a designated market center even if another market center is publishing a better quotation. An investor submitting an ISO must satisfy order protection rules by concurrently submitting orders to the markets with better prices. We find that ISOs represent 46% of trades and 41% of volume in our sample. ISO trades have a significantly larger information share despite their small trade size relative to non-ISO trades. Post trade return analysis suggests that informed institutions are the main users of ISO trades. Copyright © 2012, Michael G. Foster School of Business, University of Washington, Seattle, WA 98195.

Publication Title

Journal of Financial and Quantitative Analysis