Update - Cboe Equities Updates Unit Symbol Distribution

Effective June 29, 2026, all Cboe-affiliated U.S. Equities Exchanges will rebalance and update the symbol ranges for all Matching Units. Please refer to the technical specification listed below for the new symbol range distributions.

On BYX, EDGX, and EDGA Exchanges, BZX Exchange listed symbols will be spread across all active units using the defined static symbol ranges. Historically, all BZX Exchange listed symbols were located on matching unit 32. As part of this change, BZX-listed symbols will no longer be located on matching unit 32 and will instead be allowed to reside wherever they would normally fall within the statically defined alpha ranges. This will better allocate BZX Exchange listed symbols across all matching units on BYX, EDGX, and EDGA. Upon the effective date on BYX, EDGX, and EDGA Exchanges, unit 32 will be idled and will only send heartbeats.

On BZX Exchange, listed symbols will be dynamically spread across matching units 32-35. Matching Unit 35, which was previously allocated to Corporate IPO symbols only, has now been included in the list of units that will host BZX-listed ETP symbols. BZX-listed symbols are mapped to matching units 32-35 dynamically each day as has been previously announced. Customers can download the listed symbol to matching unit mapping daily beginning at 2:00 a.m. ET from this webpage by selecting Download Unit Breakdown.

Cboe Global Cloud customers are advised that the symbol rebalance will impact Kafka consumer mappings.

The updated symbol ranges are currently available to test in all Equities certification environments. The Equities production environments will also be available for a customer weekend test on Saturday, June 27, 2026.

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