FTEK · Fuel Tech, Inc.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.05. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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 share price. The shares were purchased in multiple transactions for an average price of $1.02. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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 share price. The shares were purchased in multiple transactions for an average price of $1.02. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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 share price. The shares were purchased in multiple transactions for an average price of $1.005. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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 share price. The shares were purchased in multiple transactions for an average price of $1.005. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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 share price. The shares were purchased in multiple transactions for an average price of $1.044803. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $1.19 to $1.20, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date.

Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock.

The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above.

The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $1.199781 to $1.20, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. 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.