Contact Us



General Inquiries

+1 312 883 3411

Mon-Fri 06:45-17:30 (Central Time)

Trading Hours

View trading session times for OneChicago Delta1, hours of availabiity for user acceptance test, and the exchange holiday calendar.

Subscription Lists

Join a subscription list to receive emails for software updates, network maintenance and system availability, corporate actions, and product news.

Support Teams

Support / Trading Operations

+1 312 883 3411

Mon-Sun 24hrs

Compliance Hotline

+1 312 883 3409

Mon-Fri 08:00-17:00 (Central Time)

Network Operations Center

+1 312 883 3412

Mon-Sun 24hrs

Media Inquiries

+1 312 883 3440

Mon-Fri 10:00-17:00 (Central Time)