The Securities and Exchange Commission today announced it has voted to adopt amendments to Regulation ATS to enhance operational transparency and regulatory oversight of alternative trading systems (ATSs) that trade stocks listed on a national securities exchange. “I applaud the staff’s retrospective review of our regulation of ATSs. I agree that promoting greater transparency in order interaction, matching, and execution will help empower investors and their intermediaries to find those trading venues that best meet their trading and investing objectives,” said SEC Chairman Jay Clayton.