This notice is being issued to announce mandatory Virtual Trading Floor (“VTF”) production testing on Saturday, October 30, 2021 or Saturday, November 6, 2021 from 10:00 a.m. to 12:00 p.m. EST for BOX Trading Floor Participants.1 BOX Trading Floor Participants must participate from their off-site locations and not from the BOX Trading Floor. Participation at either production session will satisfy the Exchange’s mandatory testing requirement.

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