OPAL

opal-202603160001842279FALSE00018422792026-03-162026-03-16

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 16, 2026

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601

(Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per share

OPAL

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On March 16, 2026, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the year ended December 31, 2025. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP financial measure adjusts net income for interest and financing expense, net, net income attributable to non-redeemable non-controlling interests, depreciation, amortization and accretion, adjustments to reflect Adjusted EBITDA from equity method investments, fair value changes and non-recurring charges, stock-based compensation, major maintenance on Renewable Power, RNG development costs, and ITC proceeds, net. Management believes this non-GAAP financial measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the business;

opal-202511060001842279FALSE00018422792025-11-062025-11-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 6, 2025

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On November 6, 2025, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the quarter ended September 30, 2025. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP financial measure adjusts net income for interest and financing expense, net, net income attributable to non-redeemable non-controlling interests, depreciation, amortization and accretion, adjustments to reflect Adjusted EBITDA from equity method investments, fair value changes and non-recurring charges, stock-based compensation, major maintenance on Renewable Power, RNG development costs, and ITC proceeds, net. Management believes this non-GAAP financial measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the busin

opal-202508070001842279FALSE00018422792024-11-072024-11-07

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 7, 2025

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On August 7, 2025, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the quarter ended June 30, 2025. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP financial measure adjusts net income for interest and financing expense, net, net income attributable to non-redeemable non-controlling interests, depreciation, amortization and accretion, adjustments to reflect Adjusted EBITDA from equity method investments, fair value changes and non-recurring charges, Stock-based compensation, major maintenance on Renewable Power, RNG development costs, and ITC proceeds, net. Management believes this non-GAAP financial measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the business; (3)

opal-202505080001842279FALSE00018422792024-11-072024-11-07

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 8, 2025

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On May 8, 2025, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the three months ended March 31, 2025. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP financial measure adjusts net income for interest and financing expense, net, net (income) loss attributable to non-redeemable non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring charges, major maintenance on Renewable Power, RNG development costs, virtual pipeline costs, and ITC proceeds, net. Management believes this non-GAAP financial measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s cor

opal-202503130001842279FALSE00018422792025-02-032025-02-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 13, 2025

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On March 13, 2025, OPAL Fuels Inc. (the “Company”) issued a press release regarding its financial results for the three and twelve months ended December 31, 2024. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA (“Adjusted EBITDA”). This non-GAAP measure adjusts net income for interest and financing expense, net, loss on debt extinguishment, net (income) loss attributable to non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, loss on warrant exchange, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring expenses, major maintenance on renewable power, RNG development and virtual pipeline costs, ITC proceeds and gain on deconsolidation of variable interest entities.

Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effe

opal-202502270001842279FALSE00018422792024-07-012024-07-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 27, 2025

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On February 27, 2025, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the twelve months ended December 31, 2024 after the market closes on Thursday, March 13, 2025 and that it will host an earnings conference call on Friday, March 14, 2025, at 11:00 AM Eastern Daylight Time. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated February 27, 2025.

104Cover Page Interactive Data File.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: February 27, 2025

OPAL Fuels Inc.

By: /s/ Kazi Hasan Name: Kazi Hasan Title: Chief Financial Officer

opal-202411070001842279FALSE00018422792024-11-072024-11-07

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 7, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On November 7, 2024, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the three months ended September 30, 2024. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP financial measure adjusts net income for interest and financing expense, net, loss on debt extinguishment, net (income) loss attributable to non-redeemable non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, loss on warrant exchange, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring expenses, major maintenance on Renewable Power, gain on deconsolidation of VIEs, project development and startup costs, incremental virtual pipeline costs at Prince William RNG facility due to their temporary nature, and ITC proceeds, net of expenses. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Com

opal-202408070001842279FALSE00018422792024-07-012024-07-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 7, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On August 7, 2024, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the three months ended June 30, 2024. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP measure adjusts net income for interest and financing expense, net, net (income) loss attributable to non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, loss on warrant exchange, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring expenses and major maintenance on renewable power. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the business; and (3

opal-202407250001842279FALSE00018422792024-07-012024-07-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 25, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On July 25, 2024, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the three months ended June 30, 2024 after the market closes on Wednesday, August 7, 2024 and that it will host an earnings conference call on Thursday, August 8, 2024, at 11:00 AM Eastern Daylight Time. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated July 25, 2024.

104Cover Page Interactive Data File.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 25, 2024

OPAL Fuels Inc.

By: /s/ Scott Contino Name: Scott Contino Title: Interim Chief Financial Officer

opal-202405090001842279FALSE00018422792024-05-092024-05-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 9, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On May 9, 2024, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the three months ended March 31, 2024. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America ("GAAP") in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA ("Adjusted EBITDA"). This non-GAAP measure adjusts net income for interest and financing expense, net, net (income) loss attributable to non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, loss on warrant exchange, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring expenses and major maintenance on renewable power. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the business; and (3) th

opal-202404250001842279FALSE00018422792024-04-252024-04-25

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 25, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On April 25, 2024, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the three months ended March 31, 2024 after the market closes on Thursday, May 9, 2024 and that it will host an earnings conference call on Friday, May 10, 2024, at 11:00 AM Eastern Daylight Time. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated April 25, 2024.

104Cover Page Interactive Data File.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: April 30, 2024

OPAL Fuels Inc.

By: /s/ Scott Contino Name: Scott Contino Title: Interim Chief Financial Officer

opal-202403130001842279FALSE00018422792024-03-132024-03-13

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 13, 2024

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On March 13, 2024, OPAL Fuels Inc. (the ”Company”) issued a press release regarding its financial results for the three and twelve months ended December 31, 2023. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA (“Adjusted EBITDA”). This non-GAAP measure adjusts net income for interest and financing expense, net, loss on debt extinguishment, net (income) loss attributable to non-controlling interests, depreciation, amortization and accretion expense, adjustments to reflect Adjusted EBITDA from equity method investments, loss on warrant exchange, unrealized (gain) loss on derivative instruments, non-cash charges, one-time non-recurring expenses, major maintenance on renewable power and gain on deconsolidation of VIEs. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Compan

opal-202311130001842279FALSE00018422792023-11-132023-11-130001842279us-gaap:CommonClassAMember2023-11-132023-11-130001842279us-gaap:WarrantMember2023-11-132023-11-13

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 13, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC Warrants, each whole warrant exercisable for one share of Class A Common Stock OPALWThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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. ☐

Explanatory Note

This Current Report on Form 8-K amends the Current Report on Form 8-K of OPAL Fuels Inc. (the “Company”), originally furnished by the Company to the Securities and Exchange Commission on November 13, 2023 (the “Initial 8-K”). The sole purpose for filing this amended report is to correct certain clerical errors contained in the press release attached as Exhibit 99.1 to the Initial 8-K as described further below. A corrected Exhibit 99.1 is attached to this Report as Exhibit 99.1.

Item 2.02. Results of Operations and Financial Condition

On November 13, 2023, the Company issued a press release regarding its financial results for the three and nine months ended September 30, 2023. Due to a clerical error in inter-segment allocation of interest expense, Adjusted EBITDA for the Company's RNG Fuel segment was incorrectly understated by $3.9 million and the Adjusted EBITDA for Corporate segment was overstated by the same amount. The correct Adjusted EBITDA should have been $25,423 and $(38,472) for the RNG Fuel segment and the Corporate segment, respectively. This has been corrected in Exhibit 99.1 attached hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

To supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with accounting principles generally

opal-202311130001842279FALSE00018422792023-11-132023-11-13

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 13, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On November 13, 2023, OPAL Fuels Inc. (the "Company") issued a press release regarding its financial results for the three and nine months ended September 30, 2023. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA (“Adjusted EBITDA”). This non-GAAP measure adjusts net income for realized and unrealized gain on interest rate swaps, net loss attributable to non-redeemable non-controlling interests, transaction costs and one-time non-recurring charges, non-cash charges, gain on deconsolidation of variable interest entities, amortization of basis differences in equity method investments, major maintenance for Renewable Power and unrealized loss (gain) for derivative instruments. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) the measure excludes the effect of items that management believes are not directly attributable to the Company’s cor

opal-202310300001842279FALSE00018422792023-10-302023-10-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 30, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On October 30, 2023, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the three and nine months ended September 30, 2023 after the market closes on Monday, November 13, 2023 and that it will host an earnings conference call on Tuesday, November 14, 2023, at 11:00 AM EDT. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated October 30, 2023.

104Cover Page Interactive Data File.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: October 31, 2023

OPAL Fuels Inc.

By: /s/ John Coghlin Name: John Coghlin Title: General Counsel

opal-202308090001842279FALSE00018422792023-08-092023-08-09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 9, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On August 9, 2023, OPAL Fuels Inc. (the ”Company”) issued a press release regarding its financial results for the three and six months ended June 30, 2023. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measures such as adjusted net loss (“Adjusted net loss”), basic and diluted adjusted net loss per share (“Basic and Diluted Adjusted net loss per share”) and adjusted EBITDA (“Adjusted EBITDA”). Adjusted net loss and Basic and Diluted Adjusted net loss per share adjust net income and basic and diluted earnings per share for gain on deconsolidation of variable interest entities, amortization of basis difference on our equity method investments. Adjusted EBITDA adjusts our net income for net loss attributable to non-redeemable non-controlling interests, transaction costs and one-time non-recurring charges, non-cash charges, gain on deconsolidation of VIEs, amortization of basis differences in equity method investments, major maintenance for Renewable Power, unrealized loss (gain) for derivative instruments, environmental credits associated with renewable biogas that has been produced and is in storage pending completion of certification of the relevant

opal-202307190001842279FALSE00018422792023-07-192023-07-19

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 19, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On July 19, 2023, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the three and six months ended June 30, 2023 after the market closes on Wednesday, August 9, 2023 and that it will host an earnings conference call on Thursday, August 10, 2023, at 11:00 AM EDT. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated July 19, 2023.

104Cover Page Interactive Data File.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: July 20, 2023

OPAL Fuels Inc.

By: /s/ Ann Anthony Name: Ann Anthony Title: Chief Financial Officer

opal-202305100001842279FALSE00018422792023-05-102023-05-10

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 10, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K/A filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Explanatory Note

This Current Report on Form 8-K/A amends the Current Report on Form 8-K of OPAL Fuels Inc. (the “Company”), originally furnished by the Company to the Securities and Exchange Commission on May 10, 2023 (the “Initial 8-K”). The sole purpose for filing this amended report is to correct certain clerical errors contained in the press release attached as Exhibit 99.1 to the Initial 8-K as described further below. A corrected Exhibit 99.1 is attached to this Current Report on Form 8-K/A as Exhibit 99.1.

Item 2.02. Results of Operations and Financial Condition

On May 10, 2023, the Company issued a press release regarding its financial results for the three months ended March 31, 2023. Due to a clerical error, the anticipated number of renewable identification numbers (“RINs”) to be generated upon the certification of renewable natural gas (“RNG”) produced was incorrectly stated as 5.9 million RINs, when in fact, upon certification, such RNG produced is anticipated to generate approximately 4.2 million RINs. This has been subsequently corrected in Exhibit 99.1 attached hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K/A, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K/A and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K/A, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA (“Adjusted EBITDA”). This non-GAAP Measure adjusts net income for realized

opal-202305100001842279FALSE00018422792023-05-102023-05-10

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 10, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $0.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

On May 10,2023, OPAL Fuels Inc. (the ”Company”) issued a press release regarding its financial results for the three months ended March 31, 2023. A copy of the press release is furnished as Exhibit 99.1 hereto.

The information disclosed under this Item 2.02 of this Current Report on Form 8-K, including the exhibit, is being "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 2.02 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Additionally, to supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) in Exhibit 99.1, the Company uses a non-GAAP financial measure that it calls adjusted EBITDA (“Adjusted EBITDA”). This non-GAAP Measure adjusts net income for realized and unrealized gain on interest rate swaps, net loss attributable to non-redeemable non-controlling interests, stock-based compensation expense, transaction costs and other one time non recurring charges, other non-cash charges, major maintenance for renewable power, unrealized loss (gain) for derivative instruments, non cash gain on reversal of a liability to non redeemable non-controlling interests, loss on disposal of assets, gain on redemption of Note receivable, gas in storage with forward purchase agreement and gain on equity method investments. Management believes this non-GAAP measure provides meaningful supplemental information about the Company’s performance, for the following reasons: (1) it allows for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and oper

opal-202304280001842279FALSE00018422792023-04-282023-04-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 28, 2023

OPAL Fuels Inc. (Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation) 001-40272 (Commission File Number) 98-1578357 (IRS Employer Identification No.)

One North Lexington Avenue, Suite 1450 White Plains, New York 10601 (Address of principal executive offices) (Zip Code)

Registrant's telephone number, including area code: (914) 705-4000

Not Applicable (Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A common stock, par value $.0001 per shareOPALThe Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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. ☐

Item 2.02. Results of Operations and Financial Condition

Item 7.01. Regulation FD Disclosure

On April 28, 2023, OPAL Fuels Inc. (the “Company”) issued a press release announcing that it will report its earnings results for the first quarter ended March 31, 2023 after the market closes on Wednesday, May 10, 2023 and that it will host an earnings conference call on Thursday, May 11, 2023, at 11:00 AM EST. A copy of the press release is attached hereto as Exhibit 99.1.

The information disclosed under this Item 7.01, including the exhibit, is being ”furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the ”Exchange Act”), or otherwise subject to the liabilities of such section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. By filing this Current Report on Form 8-K and furnishing this information, the Company makes no statement or admission as to the materiality of any information in this Item 7.01 or the exhibit attached hereto.

This Current Report on Form 8-K, including the exhibit, contains forward-looking statements within the meaning of the federal securities laws. These forward looking statements are based on current expectations and are not guarantees of future performance. Further, the forward-looking statements are subject to the limitations listed in Exhibit 99.1 and in the other SEC reports of the Company, including that actual events or results may differ materially from those in the forward-looking statements.

Item 9.01. Financial Statements and Exhibits

Exhibit Number Description

99.1Press release, issued by OPAL Fuels Inc., dated April 28, 2023.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: April 28, 2023

OPAL Fuels Inc.

By: /s/ Ann Anthony Name: Ann Anthony Title: Chief Financial Officer