A bank that worked with Epiq Systems to promote services to Chapter 7 bankruptcy trustees has sued the legal vendor, claiming the company violated a contract by selling its bankruptcy software unit to a competitor that pushed trustees to switch banks.

In its lawsuit Friday, MUFG Union Bank said more than $150 million of bankruptcy trustee assets have left its vaults since Epiq sold its Chapter 7 software unit to Axos Bank last year. That transaction violated the joint services agreement Epiq signed with the bank, MUFG Union Bank argued. The bank has also named Axos as a defendant, claiming it is liable for interfering with the contract. It argues Axos’ client-poaching efforts are speeding up.