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Using firms’ receipt of SEC comment letters, this study investigates their selection of mandatory filing types when producing deficient disclosures in response to the product market competition. Empirical evidence reveals a positive association between two firm-level measures of product market competition and a firm's likelihood of receiving comment letters for non-10-K filings. These patterns are particularly pronounced when firms face a higher likelihood of new market entrants or operate as industry followers. Additionally, firms receiving comment letters for non-10-K filings experience increased sales and market share in the subsequent year. Overall, these findings suggest that firms strategically make deficient disclosures in non-10-K filings to minimize regulatory costs. © 2024 Elsevier B.V.