5:23 PM CT
Information Circular IC13-034
Date: April 25, 2013
To: All CBOE Customers
From: Bill Brodsky
RE: Today¿s Trading Issue
We regret the systems outage that delayed today¿s opening of CBOE. We have isolated the software issue that caused the problem and have made the necessary adjustments for a normal opening tomorrow.
We are also conducting an ongoing and thorough internal review of the software problem to prevent something like this from happening again. Moreover, we determined that today¿s issue was in no way related to a cyber-attack.
We apologize for any inconvenience that this may have caused and we look forward to a normal opening tomorrow.
This is available on the IC section of the CBOE Website
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express or implied, including, without limitation, any warranty with respect to
accuracy, merchantability, or fitness for a particular purpose. Neither CBOE nor
any person or entity affiliated with CBOE shall have any liability for any inaccuracies,
omissions, human or machine errors, or other irregularities in the information and/or