OPAL · OPAL Fuels Inc.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging between $1.98 and $2.02. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging between $2.02 and $2.09. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging between $1.99 and $2.10. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging between $1.94 and $2.06. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2024, the Reporting Person was granted 201,613 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2025, (ii) March 31, 2026, and (iii) March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2023, the Reporting Person was granted 107,605 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2024, (ii) March 31, 2025, and (iii) March 31, 2026, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2024, the Reporting Person was granted 70,565 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2025, (ii) March 31, 2026, and (iii) March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2025, the Reporting Person was granted 195,772 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2026, (ii) March 31, 2027, and (iii) March 31, 2028, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2023 the Reporting Person was awarded a target number of performance-based restricted stock units ("PRSUs"), subject to satisfaction of performance conditions as determined by the Board of Directors of OPAL Fuels Inc. Each PRSU represented the right to receive, at settlement, one share of Class A common stock. The amount shown represents the actual number of units earned by the Reporting Person pursuant to the satisfaction of performance conditions.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2023 the Reporting Person was awarded a target number of performance-based restricted stock units ("PRSUs"), subject to satisfaction of performance conditions as determined by the Board of Directors of OPAL Fuels Inc. Each PRSU represented the right to receive, at settlement, one share of Class A common stock. The amount shown represents the actual number of units earned by the Reporting Person pursuant to the satisfaction of performance conditions.

Granted pursuant to the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan").

The Reporting Person was granted an option to purchase shares of the Issuer's Class A common stock (the "Option") at an exercise price of $2.52 per share, which was the volume weighted average price of the Issuer's Class A common stock for the five days immediately preceding March 31, 2026, as quoted on the Nasdaq Stock Market. The Option vests in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided, that the Reporting Person continues to provide services to the Issuer through the applicable vesting date.

In the event that the Reporting Person's employment is terminated by reason of the Reporting Person's disability or termination without cause, the Options shall vest with respect to the number of shares of Class A common stock that would have vested upon the next vesting date following such termination, had the Reporting Person remained an employee.

Notwithstanding the foregoing, upon the occurrence of a termination of employment by reason of the Reporting Person's (i) termination without cause; or (ii) resignation for good reason, in connection with or within the 24 months following the consummation of a Change in Control (as defined in the Plan and the relevant award agreement), any unvested portion of the Option shall accelerate and vest in full.

Upon the occurrence of a termination by reason of the Reporting Person's death, any unvested portion of the Option shall accelerate and vest in full.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Granted pursuant to the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan").

The Reporting Person was granted an option to purchase shares of the Issuer's Class A common stock (the "Option") at an exercise price of $2.52 per share, which was the volume weighted average price of the Issuer's Class A common stock for the five days immediately preceding March 31, 2026, as quoted on the Nasdaq Stock Market. The Option vests in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided, that the Reporting Person continues to provide services to the Issuer through the applicable vesting date.

In the event that the Reporting Person's employment is terminated by reason of the Reporting Person's disability or termination without cause, the Options shall vest with respect to the number of shares of Class A common stock that would have vested upon the next vesting date following such termination, had the Reporting Person remained an employee.

Notwithstanding the foregoing, upon the occurrence of a termination of employment by reason of the Reporting Person's (i) termination without cause; or (ii) resignation for good reason, in connection with or within the 24 months following the consummation of a Change in Control (as defined in the Plan and the relevant award agreement), any unvested portion of the Option shall accelerate and vest in full.

Upon the occurrence of a termination by reason of the Reporting Person's death, any unvested portion of the Option shall accelerate and vest in full.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2025, the Reporting Person was granted 489,429 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2026, (ii) March 31, 2027, and (iii) March 31, 2028, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

On March 31, 2026, the Reporting Person was granted 111,576 RSUs pursuant to the Plan. RSUs are scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2025, the Reporting Person was granted 171,300 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2026, (ii) March 31, 2027, and (iii) March 31, 2028, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2024, the Reporting Person was granted 201,613 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2025, (ii) March 31, 2026, and (iii) March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2025, the Reporting Person was granted 110,122 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2026, (ii) March 31, 2027, and (iii) March 31, 2028, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

On March 31, 2026, the Reporting Person was granted 54,773 RSUs pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan. The RSUs are scheduled to vest on March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2026, the Reporting Person was granted 405,729 RSUs pursuant to the Plan. RSUs are scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

On March 31, 2026, the Reporting Person was granted 101,433 RSUs pursuant to the Plan. RSUs are scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Represents the shares held by the Company to satisfy tax withholding requirements on vesting of restricted stock units. The total value of securities withheld was based on a price of $2.52 per share, the closing price of Class A common stock on March 31, 2026.

On March 31, 2026, the Reporting Person was granted 54,773 RSUs pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan. The RSUs are scheduled to vest on March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Granted pursuant to the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan").

The Reporting Person was granted an option to purchase shares of the Issuer's Class A common stock (the "Option") at an exercise price of $2.52 per share, which was the volume weighted average price of the Issuer's Class A common stock for the five days immediately preceding March 31, 2026, as quoted on the Nasdaq Stock Market. The Option vests in three (3) equal installments on each of the following dates: (i) March 31, 2027, (ii) March 31, 2028, and (iii) March 31, 2029, provided, that the Reporting Person continues to provide services to the Issuer through the applicable vesting date.

In the event that the Reporting Person's employment is terminated by reason of the Reporting Person's disability or termination without cause, the Options shall vest with respect to the number of shares of Class A common stock that would have vested upon the next vesting date following such termination, had the Reporting Person remained an employee.

Notwithstanding the foregoing, upon the occurrence of a termination of employment by reason of the Reporting Person's (i) termination without cause; or (ii) resignation for good reason, in connection with or within the 24 months following the consummation of a Change in Control (as defined in the Plan and the relevant award agreement), any unvested portion of the Option shall accelerate and vest in full.

Upon the occurrence of a termination by reason of the Reporting Person's death, any unvested portion of the Option shall accelerate and vest in full.

On March 31, 2026, the Reporting Person was granted 54,773 RSUs pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan. The RSUs are scheduled to vest on March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

On March 31, 2026, the Reporting Person was granted 54,773 RSUs pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan. The RSUs are scheduled to vest on March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.

Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock. This transaction represents the settlement of restricted stock units in shares of Class A common stock on their scheduled vesting date.

On March 31, 2024, the Reporting Person was granted 70,565 restricted stock units ("RSUs") pursuant to the terms of the Issuer's 2022 Omnibus Equity Incentive Plan (the "Plan"). RSUs were scheduled to vest in three (3) equal installments on each of the following dates: (i) March 31, 2025, (ii) March 31, 2026, and (iii) March 31, 2027, provided that the Reporting Person continues to provide services to the Issuer through the applicable vesting date. Each restricted stock unit represents the right to receive, at settlement, one share of Class A common stock.