Cboe BIDS VWAP-X, a trading mechanism, has launched in the UK with a record day in March, facing regulatory challenges in the EU.The trajectory crossing service for UK and Swiss securities saw a daily traded value of €6.1m on March 3, 2025.Initial focus was on establishing a mix of early adopters, with average daily traded value increasing over months.BMO Capital Markets has been an early adopter of Cboe BIDS VWAP-X, emphasizing its benefits in matching trades.Trajectory crosses aim to minimize slippage and provide high-quality execution, especially in volatile markets.European regulatory challenges for trajectory crossing in the EU due to ESMA's proposed changes to RTS 1 pose obstacles.Cboe aims to offer trajectory crossing in the EU but faces opposition due to regulatory restrictions favoring brokers over exchanges.Clients like the trajectory crossing experience in the US and see its potential benefits in the UK.Norges Bank Investment Management expressed concerns about ESMA's amendment affecting equity transactions in Europe.ESMA's decision may limit competition, innovation, and market development in European capital markets, impacting investors.The proposal by ESMA could hinder access to market enhancements and disadvantage European venues in international competition.