Banks that M1 Supports Client Success December 16, 2020 17:29 Updated Follow M1 is able to establish ACH relationships with almost all US retail banks; however, there are a handful of institutions not supported by M1. To see a list of institutions not supported, please see here. Related articles Banks that M1 Finance does not Support Making your First Deposit Transferring Out of M1 Explanation of M1 Borrow Dividends in your M1 Portfolio