(8) Segment Information

TripCo, through its ownership interests in subsidiaries and other companies, is primarily engaged in the online commerce industries. TripCo identifies its reportable segments as (A) those consolidated companies that represent 10% or more of its consolidated annual revenue, annual adjusted operating income before depreciation and amortization (“Adjusted OIBDA”) or total assets and (B) those equity method affiliates whose share of earnings represent 10% or more of TripCo’s annual pre‑tax earnings.

TripCo evaluates performance and makes decisions about allocating resources to its operating segments based on financial measures such as revenue, Adjusted OIBDA, gross margin, and revenue or sales per customer equivalent. In addition, TripCo reviews nonfinancial measures such as unique website visitors, conversion rates and active customers, as appropriate.

TripCo defines Adjusted OIBDA as revenue less operating expenses, and selling, general and administrative expenses (excluding stock‑based compensation), adjusted for specifically identified non-recurring transactions. TripCo believes this measure is an important indicator of the operational strength and performance of its businesses, including each business’s ability to service debt and fund capital expenditures. In addition, this measure allows management to view operating results, and perform analytical comparisons and benchmarking between businesses and identify strategies to improve performance. This measure of performance excludes depreciation and amortization, equity settled liabilities (including stock‑based compensation), separately reported litigation settlements and restructuring and impairment charges that are included in the measurement of operating income pursuant to GAAP. Accordingly, Adjusted OIBDA should be considered in addition to, but not as a substitute for, operating income, net income, cash flow provided by operating activities and other measures of financial performance prepared in accordance with GAAP. TripCo generally accounts for intersegment sales and transfers as if the sales or transfers were to third parties, that is, at current prices.

For the nine months ended September 30, 2018, TripCo has identified the following consolidated company as its reportable segment:

TripAdvisor’s accounting policies are the same as those described in the Company’s Summary of Significant Accounting Policies included in the Annual Report on Form 10-K for the year ended December 31, 2017.

Performance Measures

Other Information

The following table provides a reconciliation of Consolidated segment Adjusted OIBDA to Operating income (loss) and Earnings (loss) before income taxes: