CSG系统国际 2025年度报告

For the fiscal year ended December 31, 2025OR CSG SYSTEMS INTERNATIONAL, INC. (Exact name of registrant as specified in its charter) Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES☒NO☐ Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or Section 15(d) of the Securities Exchange Act of 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days. YES☒NO☐ Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). YES☒NO☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerginggrowth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2of the Exchange Act. Large accelerated filer☒Accelerated filer☐Non-accelerated filer☐Smaller reporting company☐Emerging growth company☐If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internalcontrol over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm thatprepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included inthe filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensationreceived by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No☒ The number of shares of registrant’s Common Stock outstanding as of February 17, 2026 was 28,501,936. Portions of the registrant’s Definitive ProxyStatement for its 2026 Annual Meeting of Stockholders, if filed with the Securities and ExchangeCommission ("SEC")on or prior to April 30, 2026, are incorporated by reference into Part III of this Annual Report on Form 10-K, or such Part IIIinformation will be provided in an amendment filed on Form 10-K/A with the SEC no later than April 30, 2026. CSG SYSTEMS INTERNATIONAL, INC.2025 FORM 10-KTABLE OF CONTENTS PART I Item 1.BusinessItem 1A.Risk FactorsItem 1B.Unresolved Staff CommentsItem 1C.CybersecurityItem 2.PropertiesItem 3.Legal ProceedingsItem 4.Mine Safety Disclosures PART II Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases ofEquity SecuritiesItem 6.[Reserved]Item 7.Management’s Discussion and Analysis of Financial Condition and Results of OperationsItem 7A.Quantitative and Qualitative Disclosures About Market RiskItem 8.Financial Statements and Supplementary DataItem 9.Changes in and Disagreements with Accountants on Accounting and Financial DisclosureItem 9A.Controls and ProceduresItem 9B.Other InformationItem 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspections PART III Item 10.Directors, Executive Officers and Corporate GovernanceItem 11.Executive CompensationItem 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder MattersItem 13.Certain Relationships and Related Transactions, and Director IndependenceItem 14.Principal Accounting Fees and Services PART IV Item 15.Exhibits, Financial Statement SchedulesItem 16.Form 10-K SummarySignatures CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This Form 10-K, including Item 7, "Management’s Discussion and Analysis of Financial Condition and Results of Operations",contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. We intend suchforward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in Section 27Aof the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, asamended (the “Exchange Act”). Forward-looking statements relate to future events and typically add