EQUIFAX INC.(Exact name of registrant as specified in its charter) Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities ExchangeAct of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) hasbeen subjectto such filing requirements 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 toRule 405 of Regulation S-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 or a smaller reportingcompany. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Checkone): If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any 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). Yes☐No☒ On April10, 2026, there were 119,072,409 shares of the registrant’s common stock outstanding. EQUIFAX INC. QUARTERLY REPORT ON FORM 10-Q QUARTER ENDED MARCH31, 2026 INDEX PagePART I.Financial Information4Item 1.Financial Statements (Unaudited)4Consolidated Statements of Income—Three Months Ended March 31, 2026 and 20254Consolidated Statements of Comprehensive Income—Three Months Ended March 31, 2026 and 20255Consolidated Balance Sheets—March 31, 2026and December 31, 20256Consolidated Statements of Cash Flows—Three Months Ended March 31, 2026 and 20257Consolidated Statements of Shareholders' Equity and Accumulated Other Comprehensive Loss—ThreeMonths Ended March 31, 2026 and 20258Notes to Consolidated Financial Statements (Unaudited)10Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations21Item 3.Quantitative and Qualitative Disclosures About Market Risk32Item 4.Controls and Procedures32PART II.Other Information32Item 1.Legal Proceedings32Item 1A.Risk Factors33Item 2.Unregistered Sales of Equity Securities and Use of Proceeds34Item 5Other Information35Item 6.Exhibits35Signatures36 FORWARD-LOOKING STATEMENTS This report contains information that may constitute “forward-looking statements.” Generally, the words “believe,” “expect,”“intend,” “estimate,” “anticipate,” “project,” “will,” “may” and similar expressions identify forward-looking statements, whichgenerally are not historical in nature. All statements that address operating performance and events or developments that we expect oranticipate will occur in the future, including statements related to our strategy, our future operating results, improvements in ourinformation technology and data security infrastructure, the expected financial and operational benefits, synergies and growth from ouracquisitions, the expected benefits of our use of artificial intelligence, the pricing strategies, benefits and value proposition of productofferings of Equifax and its competitors, changes in the U.S. mortgage market environment (as well as changes more generally in U.S.and worldwide economic conditions), such as changes in interest rates and inflation levels, and similar statements about our financialoutlook and business plans, are forward-looking statements. Management believes that these forward-looking statements arereasonable as and when made. However, forward-looking statements are subject to certain risks and uncertainties that could causeactual results to differ materially from the Company’s historical experience and our present expectations or projections, includingwithout limitation our expectations regarding the Company’s outlook, long-term organic and inorganic growth, and customeracceptance of our business solutions referenced below under “Item 2. Management’s Discussion and Analysis of Financial Conditionand Results of Operations — Business Overview.” These risks and uncertainties include, but are not limited to, those described in PartII, “Item 1A. Risk Factors” and elsewhere in our Annual Report on Form 10-K for the year ended December31, 2025, and thosedescribed from time to time in our future reports filed with the United States Securities and Exchange Commission (“SEC”). As aresult of such risks and uncertainties, we urge you not to place undue reliance on any such forward-looking statements. Forward-looking statements speak only as of the date when made. We undertake no obligation to publicly update or revise any forward-lookingstatements, whether as a result of new information, future events or otherwise, except as required by law. EQUIFAX INC.