SAB 99 — Staff Accounting Bulletin No. 99, issued by the SEC in 1999 — established the authoritative framework for assessing whether a misstatement in financial statements is material and therefore requires correction or disclosure. It is the document that killed the “5% rule” as a reliable safe harbor. What It Is Before SAB 99, a widespread informal practice held that misstatements below 5% of net income were automatically immaterial and could be left uncorrected.

Segment reporting is the requirement that public companies disclose financial information separately for each significant operating segment of their business. It exists because consolidated financial statements, while accurate in the aggregate, can obscure the performance dynamics of individual business units that investors and analysts need to assess value. What It Is A diversified company might operate a fast-growing software division, a mature hardware business, and a declining services unit. The consolidated income statement shows total revenue and operating income — the blended result.