(Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March31, 2026or ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from_______________ to ____________ Commission File Number: 001-40272 OPAL FUELS INC. 98-1578357 (State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.) 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 Exchange Actof 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has beensubject to 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 to Rule405 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).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, 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 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☒ As of May7, 2026,a total of 30,357,544 shares of Class A common stock, par value $0.0001 per share, 121,500,000 shares of Class Bcommon stock, par value of $0.0001 per share and 22,899,037 shares of Class D common stock, par value $0.0001 per share were outstanding. CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of the Private Securities Litigation ReformAct of 1995, that involve risks and uncertainties. All statements other than statements of historical facts contained in this Quarterly Report onForm 10-Q, including statements regarding our future results of operations or financial condition, business strategy and plans and objectives ofmanagement for future operations, are forward-looking statements. Words such as “anticipates,” “believes,” "could," “estimates,” “expects,”“forecasts,” “future,” “goal,” “intends,” “may,” “objective,” “outlook,” “plans,” "potential," “projected,” “propose,” “seeks,” "should," “target,”“will,” “would” and variations of these words or similar expressions (or the negative versions of such words or expressions) are intended toidentify forward-looking statements. These forward-looking statements are not guarantees of future performance, conditions or results, andinvolve a number of known and unknown risks, uncertainties, assumptions and other important factors, many of which are outside our control,which could cause actual results or outcomes to differ materially from those discussed in the forward-looking statements. Important factors,among others, which may affect actual results or outcomes include: ▪our ability to grow and manage growth profitably, and maintain relationships with customers and suppliers;▪our success in retaining or recruiting, our principal officers, key employees or directors;▪intense competition and competitive pressures from other companies in the industry in which we operate;▪increased costs of, or delays in obtaining, key components or labor for the construction and completion of LFG (as defined below) andlivestock waste projects that generate electricity and RNG (as defined below), CNG (as defined below) and hydrogen dispensing stations;▪factors relating to our business, operations and financial performance, including market conditions and global and economic factorsbeyond our control;▪the reduction or elimination of government economic incentives to the renewable energy market;▪factors associated with companies that are engaged in the production and integration of RNG, including (i) anticipated trends, growth ratesand challenges in those businesses and in the markets in which they operate, (ii) contractual arrangements with, and the cooperation of,owners and operators of the landfill and livestock biogas conversion project facilities, on which we operate our LFG and livestock wasteprojects that generate electricity and (iii) RNG prices for Environmental Attributes (as defined below), LCFS (as defined below) creditsand other incentives;▪the ability to identify, acquire, develop and operate renewable projects and Fueling Stations (as defined be