EFFECTIVE SEPT 5, 2017:  
SEC Adopts T+2 Settlement Cycle for Securities Transactions

https://www.sec.gov/news/press-release/2017-68-0

 

Updated Investor Bulletin:
New “T+2” Settlement Cycle – What Investors Need To Know

 https://www.sec.gov/oiea/investor-alerts-and-bulletins/ibsettlementcycle