ARQ

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2027.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2027.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2027.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2027.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2027.

The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The sale was made to satisfy tax withholding obligations to be funded by a "sell to cover" transaction.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.2700 to $2.2822, inclusive. The reporting person undertakes to provide to 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 Form 4.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on March 23, 2026.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.140 to $2.285, inclusive. The reporting person undertakes to provide to 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 Form 4.

The shares reported on this row are held by Omeshorn Holdings Ltd. Richard Campbell-Breeden, a Director of the Issuer, is a director of Omeshorn Holdings Ltd. and therefore is an indirect beneficial owner of the securities reported herein.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on March 23, 2026.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on March 23, 2026.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on March 23, 2026.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.8850 to $1.8900, inclusive. The reporting person undertakes to provide to 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 Form 4.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.925 to $1.950, inclusive. The reporting person undertakes to provide to 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 Form 4.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of PSUs on February 27, 2026.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 30,225 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 40,286 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of PSUs on February 27, 2026.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 51,467 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 68,600 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 51,467 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 68,600 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

Represents the maximum number of PSUs that were eligible to vest, if at all, which was 200% of the target award.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of PSUs on February 27, 2026.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 21,179 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 28,229 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

Represents the maximum number of PSUs that were eligible to vest, which was 200% of the target award.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 30,225 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 40,286 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

Represents the maximum number of PSUs that were eligible to vest, which was 200% of the target award.

On February 27, 2026, the Compensation Committee of the Board of Directors of the Issuer determined that of the 21,179 performance share units ("PSUs") awarded to the reporting person on March 23, 2023 pursuant to the 2023 Long Term Incentive Plan under the Issuer's 2022 Omnibus Equity Incentive Plan, 28,229 PSUs vested based on the achievement of specific performance criteria over a three year performance period ended December 31, 2025. Each vested PSU represented the right to receive one share of the Issuer's common stock.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.49 to $3.62, inclusive. The reporting person undertakes to provide to 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 Form 4.

The shares reported on this row are held by Omeshorn Holdings Ltd. Richard Campbell-Breeden, a Director of the Issuer, is a director of Omeshorn Holdings Ltd. and therefore is an indirect beneficial owner of the securities reported herein.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.53 to $3.56. The reporting person undertakes to provide to 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 Form 4.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.73 to $3.86, inclusive. The reporting person undertakes to provide to 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 Form 4.

The shares of Common Stock reported on this row are held by RER Investments LLC ("RER Investments"). Mr. Rasmus, the Chief Executive Officer and a Director of the Issuer, is the ultimate control person of RER Investments, and an indirect beneficial owner of these shares. Mr. Rasmus disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Represents shares of common stock of the Issuer held by MWB Limited which were transferred to a minority owner of MWB Limited on September 25, 2025 in anticipation of the intended dissolution of the MWB Limited entity. Allard Services Limited is the majority owner of MWB Limited. Concurrently, the remaining 352,042 shares of the Issuer's common stock held by MWB Limited were transferred to Allard Services Limited and are included in the total securities beneficially owned by Allard Services Limited reported in this row.

The reported amount includes 352,042 shares, 43,034 shares and 21,908 shares of common stock that were transferred to Allard Services Limited from MWB Limited, Markham Fuels Management Limited and Stannard Limited, respectively, since the date of the last report filed by the reporting person. As of the date of this report, MWB Limited, Markham Fuels Management Limited and Stannard Limited no longer hold shares of the Issuer's common stock.

The shares reported on this row are held by Allard Services Limited. Julian McIntyre, a Director of the Issuer, controls Allard Services Limited and therefore is an indirect beneficial owner of the securities reported herein.

Reflects the withholding of shares of the Issuer's common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock awards ("RSAs") on September 18, 2025.

The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The sale was made to satisfy tax withholding obligations to be funded by a "sell to cover" transaction.

The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The sale was made to satisfy tax withholding obligations to be funded by a "sell to cover" transaction.

The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The sale was made to satisfy tax withholding obligations to be funded by a "sell to cover" transaction.

The sale reported on this Form 4 represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock awards. The sale was made to satisfy tax withholding obligations to be funded by a "sell to cover" transaction.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2026.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2026.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2026.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2026.

Represents restricted stock awards granted in exchange for the reporting owner's service as a non-employee director of the Issuer. The restricted stock awards shall vest on July 1, 2026.

The reported transaction represents a privately negotiated purchase of 50,000 shares of common stock of the Issuer from another non-affiliated holder of the Issuer's common stock at the negotiated price of $4.10 per share.

The reported amount includes 324,955 shares of common stock that were transferred to Community Master Fund LP from CF Global Credit, LP since the date of the last report filed by the reporting person.

The shares reported on this row are held by Community Master Fund LP. Jeremy Blank, a Director of the Issuer, controls the general partner of Community Master Fund LP. Mr. Blank is an investor in Community Master Fund LP and therefore is an indirect beneficial owner of a portion of these shares. Mr. Blank disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

The reported transaction represents a privately negotiated purchase of 25,000 shares of common stock of the Issuer from another non-affiliated holder of the Issuer's common stock at the negotiated price of $4.10 per share.

The reported transaction represents a privately negotiated purchase of 75,000 shares of common stock of the Issuer from another non-affiliated holder of the Issuer's common stock at the negotiated price of $4.10 per share.

The shares reported on this row are held by Omeshorn Holdings Ltd. Richard Campbell-Breeden, a Director of the Issuer, is a director of Omeshorn Holdings Ltd. and therefore is an indirect beneficial owner of the securities reported herein.

This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.50 to $4.63, inclusive. The reporting person undertakes to provide to 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 Form 4.

The shares of Common Stock reported on this row are held by RER Investments LLC ("RER Investments"). Mr. Rasmus is the ultimate control person of RER Investments, and an indirect beneficial owner of these shares. Mr. Rasmus disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

The shares of Common Stock reported on this row are held by RER Investments LLC ("RER Investments"). Mr. Rasmus is the ultimate control person of RER Investments, and an indirect beneficial owner of these shares. Mr. Rasmus disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

The shares of Common Stock reported on this row are held by RER Investments LLC ("RER Investments"). Mr. Rasmus is the ultimate control person of RER Investments, and an indirect beneficial owner of these shares. Mr. Rasmus disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

The shares of Common Stock reported on this row are held by RER Investments LLC ("RER Investments"). Mr. Rasmus is the ultimate control person of RER Investments, and an indirect beneficial owner of these shares. Mr. Rasmus disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Represents restricted stock awards granted in accordance with the Issuer's long-term incentive plan under the 2024 Omnibus Incentive Plan, as approved by stockholders on June 10, 2024. The restricted stock awards shall vest in full on April 2, 2027.