Cboe Europe will implement monitoring of inbound bandwidth per 10 Gbps physical port at the Participant access switch level, effective Monday, November 3, 2025.

From the effective date, Cboe Europe will monitor inbound bandwidth per 10 Gbps physical port at the Participant access switch level and will automatically disable any 10 Gbps physical network connection which receives inbound data exceeding a bandwidth limit of a 5 Gbps average measured over a two second time interval.

This inbound bandwidth limit is based on observations of actual data traffic patterns and will be equally applied across all Cboe Europe 10 Gbps physical ports.

The bandwidth limit is an inbound data limit and thus will not apply to outbound data, such as market data, received through a physical port. However, if a physical network connection is disabled due to exceeding the inbound bandwidth limit, the physical network connection will not be able to submit inbound data or receive outbound data until it is re-enabled.