Super Micro Computer fell more than 30% Wednesday after its auditor quit. “We are resigning due to information that has recently come to our attention which has led us to no longer be able to rely on management’s and the Audit Committee’s representations,” Ernst & Young said in its resignation letter. “Supermicro disagrees with E&Y’s decision to resign, and we are working diligently to select new auditors,” a company spokesperson told Barron’s.