CSG SYSTEMS INTERNATIONAL, INC. DISCLOSURES FOR NON-GAAP FINANCIAL MEASURES Use of Non-GAAP Financial Measures and Limitations To supplement its condensed consolidated financial statements presented in accordance with generally accepted accounting principles (GAAP), CSG uses non-GAAP adjusted revenue, non-GAAP operating income, non-GAAP adjusted operating margin percentage, non-GAAP EPS, non-GAAP adjusted EBITDA, and non-GAAP free cash flow. CSG believes that these non-GAAP financial measures, when reviewed ...