Minority Interest
The equity stake in a subsidiary not owned by the parent company, also called non-controlling interest.
What is Minority Interest?
Minority interest, formally known as non-controlling interest (NCI) under current GAAP and IFRS standards, represents the portion of a subsidiary's equity that is owned by shareholders other than the parent company. When a company consolidates a subsidiary it controls (typically owning more than 50%), the full financial statements of the subsidiary are included in the consolidated statements, but the portion not owned by the parent is shown separately. On the balance sheet, NCI appears as a component of total equity. On the income statement, net income is split between the parent's share and NCI. Enterprise value calculations include the market value of minority interests as a claim on the business.
Example
Berkshire Hathaway owns approximately 90% of BNSF Railway but consolidates 100% of its financials. The remaining ~10% owned by public shareholders is presented as non-controlling interest in Berkshire's consolidated financial statements.
Source: Investopedia — Minority Interest