(Mark One) ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period ended March 31, 2026 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period fromtoCommission File Number: 001-36373 TRINET GROUP, INC.(Exact Name of Registrant as Specified in its Charter) Delaware(State or other jurisdiction ofincorporation or organization)One Park Place, Suite 600Dublin, CA(Address of principal executive offices) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject tosuch filing requirements for the past 90 days.YesNoIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required tosubmit such files).YesNoIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and“emerging growth company” in Rule 12b-2 of the Exchange Act. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).YesNoThe number of shares of Registrant’s Common Stock outstanding as of April23, 2026 was 45,944,643. Glossary of Acronyms and Abbreviations GLOSSARY SBCSECSenior NotesSMBTriNet TrustU.S.VIEWSE Stock Based CompensationU.S. Securities and Exchange CommissionThe 2029 Notes and the 2031 NotesSmall and medium-size businessA legal trust that holds ASO client funds for remittance to ASO Users, tax authorities and certain other recipientsUnited States of AmericaVariable interest entityA worksite employee who is co-employed by, or otherwise receiving services from a TriNet PEO 2026 Q1 FORM 10-Q Cautionary Note Regarding Forward-Looking Statements For purposes of this Quarterly Report on Form 10-Q (Form 10-Q), the terms “TriNet,” “the Company,” “we,” “us” and “our” refer toTriNet Group, Inc., and its subsidiaries. This Form 10-Q contains statements that are not historical in nature, are predictive innature, or that depend upon or refer to future events or conditions or otherwise contain forward-looking statements within themeaning of Section 21 of the Securities Exchange Act of 1934, as amended, and the Private Securities Litigation Reform Act of1995. Forward-looking statements are often identified by the use of words such as, but not limited to, "ability," “anticipate,”“believe,” “can,” “continue,” “could,” “design,” “estimate,” “expect,” “forecast,” “hope,” "impact," “intend,” “may,” “outlook,” “plan,”“potential,” “predict,” “project,” “seek,” “should,” “strategy,” “target,” "value," “will,” “would” and similar expressions or variationsintendedto identify forward-looking statements.Examples of forward-looking statements include,among others,TriNet’sexpectations regarding: our plans and ability to grow our client base and our WSE base; our expectations regarding medicalutilization rates by our WSEs and the impact of inflation on our insurance costs; the impact of planned improvements to ourtechnology platform and whether it will meet the needs of our current clients and attract new ones; our ability to improve operatingefficiencies; our strategic realignment and related restructuring initiatives; the impact of our client service initiatives and whetherthey enhance client experience and satisfaction; acquisition or other opportunities to expand our product offering and providefurther scale; our continued ability to provide access to a broad range of benefit programs on a cost-effective basis; ourexpectations regarding the volume and severity of insurance claims and insurance claim trends; the effectiveness of our riskstrategies for, and management of, workers' compensation, health benefit insurance costs and deductibles; the metrics that maybe indicators of future financial performance; the impact that our benefit offerings have for SMBs seeking to attract and retainemployees; the principal competitive drivers in our market; our plans to grow net new clients and manage client attrition; ourcontinued capital investments in our software and hardware; our investment strategy and its im