
Form10-K (Mark One) ☑ANNUAL REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF1934For the fiscal year ended December 31, 2025 OR TRANSITION REPORT PURSUANT TO SECTION13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF1934 Commission file number1-36132 PLAINS GP HOLDINGS,L.P. NameofEachExchangeonWhichRegistered Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule405 of the Securities Act. Yes☑No☐ 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 of 1934 during thepreceding 12months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject to such filing requirements for the past90days.Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of RegulationS-T 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, a smaller reporting company, or an emerginggrowth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule12b-2 of theExchange Act. Large accelerated filer☑ Non-acceleratedfiler☐ 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 revisedfinancial 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 internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared 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 in the filing reflectthe 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 compensation received by any ofthe 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 Rule12b-2 of the Exchange Act).Yes☐No☑ The aggregate market value of the approximately 192.3million ClassA shares held by non-affiliates of the registrant (treating all executive officers and directors ofthe registrant and holders of 10% or more of the ClassA shares outstanding, for this purpose, as if they are affiliates of the registrant) on June 30, 2025 was approximately$3.7 billion, based on a closing price of $19.43 per ClassA share as reported on the Nasdaq Global Select Market on such date. As of February20, 2026, there were 197,904,124 ClassA shares outstanding. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s definitive Proxy Statement to be filed pursuant to Regulation 14A pertaining to the 2026 Annual Meeting of Shareholders are incorporated byreference into Part III hereof. The registrant intends to file such Proxy Statement no later than 120 days after the end of the fiscal year covered by this Form 10-K. Table of ContentsIndex to Financial Statements PLAINS GP HOLDINGS, L.P. AND SUBSIDIARIESFORM10-K—2025 ANNUAL REPORTTable of Contents PARTI Items1 and 2.Item1A.Item1B.Item 1C.Item3.Item 4. Business and PropertiesRisk FactorsUnresolved Staff CommentsCybersecurityLegal ProceedingsMine Safety Disclosures PARTII Market for Registrant’s Shares, Related Shareholder Matters and Issuer Purchases ofEquitySecurities68Reserved69Management’s Discussion and Analysis of Financial Condition and Results of Operations70Quantitative and Qualitative Disclosures About Market Risk92Financial Statements and Supplementary Data93Changes in and Disagreements With Accountants on Accounting and Financial Disclosure93Controls and Procedures93Other Information94Disclosure Regarding Foreign Jurisdictions that Prevent Inspections94 Item5. Item6.Item7.Item7A.Item8.Item9.Item9A.Item9B.Item 9C. PARTIII Item10.Directors and Executive Officers of Our General Partner and Corporate Governance95Item11.Executive Compensation95Item12.Security Ownership of Certain Beneficial Owners and Management and Related Shareholder Matters95Item13.Certain Relationships and Related Transactions, and Director Independence96Item14.Principal Accountant Fees and Services96 PARTIV Exhibits and Financial Statement Schedules97Form 10-K Summary102 Item15.Item 16. FORWARD-LOOKING STATEMENTS All statements incl