https://24exchange.com/fx/https://www.sec.gov/guidelines/different/otherarchive/other2022.htm"...think about what buying and selling exterior established hours (Pre, Market, After Hours) actually entails, particularly since 24X is wanting to permit non-displayed orders of all sorts throughout market hours and non-displayed restrict...
Here's a tweet that has the video from the SEC Assembly on Wed, Feb 15, 2023 on Shortening Settlement Occasions. The vote was on amendments to guidelines but in addition talked about t+1...