November 30, 2016 19:44:19
Post Mortem: Bats BZX Options System Issue at Close on November 30, 2016
SCI System(s) Affected: Trading
Incident Description: System Disruption - At the 4PM ET close, BZX Options experienced an issue processing Mass Cancel requests that resulted in stuck orders across multiple symbol matching ranges. All stuck orders were not executable and notice of cancellation was provided at 4:32:23PM ET.
Members Affected: 37 Members
Corrective Action: Bats has disabled a performance related update to Mass Cancel functionality that was recently activated.
Bats Trade Desk