Mutual funds SUBACCOUNTING: Rankings - Full-Service Providers (No. of Accounts) 1 Min Read Partner Insights from Facebook Twitter LinkedIn Email Full-service Subaccounting rankings by accounts. View Table Printer Friendly Version SUBACCOUNTING: Rankings - Full-Service Providers (No. of Accounts) 2019 Rank Service Provider Number of Accounts (Ks) 1 BNY Mellon 64,332 2 Envision Financial Systems, Inc. N/A