An IRC § 382 study involves a detailed review of legal documents like a company's stock ledger, SEC filings, financial statements, and transaction documents to determine if an ownership change has occurred under IRC § 382. An ownership change can limit a company's ability to use tax losses and credits from prior years. The study identifies 5% shareholders and their stock ownership over time to find ownership change dates. If an ownership change occurs, it may impose an annual limitation on tax attributes based on the company's value and tax rates.