Buy-side firms are increasingly looking to external trading support and services.
The association has sent a letter to European Commission and ESMA on the lack of regulatory clarification.
Open access was first identified in 2001 as a key element of an integrated EU post-trading landscape.
ESMA, in coordination with NCAs, continues to monitor financial markets developments due to COVID-19.
Four trade bodies said restrictions are hurting markets and disadvantaging investors.
Cboe Europe Derivatives, a new exchange, is still due to launch in the first half of next year.
Firms will have to disclose what proportion of their portfolios aligns with ESG criteria.
Regulators should focus on improving trading quality on lit venues.
Artificially boosting lit trading will harm investors.
