Auditors and Disclosure Quality: The Case of Major Customer Disclosures

SUMMARY Little is known about the relationship between disclosure quality and auditor quality. We measure disclosure quality as the likelihood of a firm fully disclosing the identity of their major customers in the Form 10-K filing. We also measure voluntary disclosure by exempt smaller reporting companies (SRCs) disclosing, and all firms disclosing the identity in the audited notes, or affirming no major customers. We expect that firms are more likely to disclose when they engage higher-quality auditors who have specialized knowledge of 10-K regulations. We hand-collect a sample of more than 26,000 (34,000) major customer disclosures that we use for our main tests (voluntary disclosure tests). We find that firms are more likely to mandatorily disclose their major customers' identity when audited by either an office- or national-level specialist whose clientele consists largely of firms with major customers. We corroborate these results with other higher-quality auditor measures: Big N, second tier, and office size. We also show that SRCs are more likely to voluntarily disclose when they engage a higher-quality auditor. We provide further evidence of an association between voluntary disclosure and a higher-quality auditor by ranking disclosure quality on audited disclosure, nonaudited disclosure, and no disclosure. JEL Classifications: M42; M41; D23. Data Availability: All data are available from public sources identified in the text.