FCEL

SEC source: 0000897069-26-001824 · form4.xml · nonDerivative · entry 1

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 118

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on January 5, 2026.

SEC source: 0000897069-26-001780 · form4.xml · nonDerivative · entry 1

Livingston III Homer John · CIK 0002140145 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,747.1994

F1 · price: The price in Column 4 is a weighted average price. The prices actually paid for the shares ranged from $15.035 to $15.06. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.

SEC source: 0000897069-26-001523 · form4.xml · nonDerivative · entry 1

Livingston III Homer John · CIK 0002140145 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,343

F1 · price: The price in Column 4 is a weighted average price. The prices actually paid for the shares ranged from $18.71 to $18.79. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares purchased at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.

SEC source: 0000897069-26-001518 · form4.xml · derivative · entry 1

Livingston III Homer John · CIK 0002140145 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,263

Underlying: Common Stock · 833 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-001516 · form4.xml · derivative · entry 1

Hansen Cynthia L · CIK 0001629601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,898

Underlying: Common Stock · 988 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-001514 · form4.xml · derivative · entry 1

England James Herbert · CIK 0001437823 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,947

Underlying: Common Stock · 1,451 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-001496 · form4.xml · nonDerivative · entry 1

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,618

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on January 5, 2026.

SEC source: 0000897069-26-001393 · form4.xml · derivative · entry 2

Livingston III Homer John · CIK 0002140145 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,430

Underlying: Common Stock · 5,896 shares

Expires not disclosed

F2 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F2 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F2 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-001393 · form4.xml · derivative · entry 1

Livingston III Homer John · CIK 0002140145 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 534

Underlying: Common Stock · 534 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-001110 · form4.xml · derivative · entry 3

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,020

Underlying: Common Stock · 2,020 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On May 8, 2024, the reporting person was granted restricted stock units, which vest 1/3 on each of the first three anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On May 8, 2024, the reporting person was granted restricted stock units, which vest 1/3 on each of the first three anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-001110 · form4.xml · nonDerivative · entry 2

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,118

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-26-001110 · form4.xml · nonDerivative · entry 1

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,610

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0000897069-26-000936 · form4.xml · derivative · entry 2

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 23,859 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units (RSUs") were converted into common stock on a one-for-one basis.

F2 · derivative.exercise_date: These RSUs (i) vested on April 21, 2026, and (ii) were settled in shares of the Company's common stock.

F2 · derivative.expiration_date: These RSUs (i) vested on April 21, 2026, and (ii) were settled in shares of the Company's common stock.

SEC source: 0000897069-26-000936 · form4.xml · nonDerivative · entry 1

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,859

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units (RSUs") were converted into common stock on a one-for-one basis.

SEC source: 0000897069-26-000938 · form4.xml · derivative · entry 2

von Althann Natica · CIK 0001477502 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 23,859 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units (RSUs") were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: These RSUs (i) vested on April 21, 2026, and (ii) were settled in shares of the Company's common stock.

F3 · derivative.expiration_date: These RSUs (i) vested on April 21, 2026, and (ii) were settled in shares of the Company's common stock.

SEC source: 0000897069-26-000938 · form4.xml · nonDerivative · entry 1

von Althann Natica · CIK 0001477502 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,988

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units (RSUs") were converted into common stock on a one-for-one basis.

F2 · balance_after: Reflects the 1-for-30 reverse stock split effected by the Issuer on November 8, 2024.

SEC source: 0000897069-26-000922 · form4.xml · nonDerivative · entry 1

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 3,590

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on January 5, 2026.

SEC source: 0000897069-26-000918 · form4.xml · derivative · entry 1

Hansen Cynthia L · CIK 0001629601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,910

Underlying: Common Stock · 2,657 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000916 · form4.xml · derivative · entry 1

England James Herbert · CIK 0001437823 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 86,496

Underlying: Common Stock · 3,902 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000875 · form4.xml · derivative · entry 1

Jordan Tyrone Michael · CIK 0001766331 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,407

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000873 · form4.xml · derivative · entry 1

Sims Wilson Donna · CIK 0001878855 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,724

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000871 · form4.xml · derivative · entry 1

von Althann Natica · CIK 0001477502 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,424

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: These restricted stock units (i) vest on the date of the regularly scheduled annual meeting of the stockholders of the Issuer to be held in 2027, and (ii) are to be settled in cash or in shares of the Company's common stock, at the discretion of the Compensation and Leadership Development Committee, as the administrator under the 2018 Omnibus Incentive Plan, as amended and restated.

F1 · derivative.exercise_date: These restricted stock units (i) vest on the date of the regularly scheduled annual meeting of the stockholders of the Issuer to be held in 2027, and (ii) are to be settled in cash or in shares of the Company's common stock, at the discretion of the Compensation and Leadership Development Committee, as the administrator under the 2018 Omnibus Incentive Plan, as amended and restated.

F1 · derivative.expiration_date: These restricted stock units (i) vest on the date of the regularly scheduled annual meeting of the stockholders of the Issuer to be held in 2027, and (ii) are to be settled in cash or in shares of the Company's common stock, at the discretion of the Compensation and Leadership Development Committee, as the administrator under the 2018 Omnibus Incentive Plan, as amended and restated.

SEC source: 0000897069-26-000868 · form4.xml · derivative · entry 1

HILZINGER MATTHEW F · CIK 0001184017 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,533

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000862 · form4.xml · derivative · entry 1

Hansen Cynthia L · CIK 0001629601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,253

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000858 · form4.xml · derivative · entry 1

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,594

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000852 · form4.xml · derivative · entry 1

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,765

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000860 · form4.xml · derivative · entry 1

England James Herbert · CIK 0001437823 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,594

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000883 · form4a.xml · derivative · entry 1

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,765

Underlying: Common Stock · 17,424 shares

Expires not disclosed

F1 · derivative.exercise_price: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Deferred common stock units issued to the reporting person pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F2 · balance_after: On April 10, 2026, two filings reporting the same transaction were made for the reporting person. One of the filings was made in error. That filing incorrectly reported that there were 82,594 derivative securities beneficially owned following the reported transaction. The reporting person is making this filing to correctly reflect the number of derivative securities beneficially owned by the reporting person following the reported transaction. It should be noted that this information is duplicative of the information reported in the other Form 4 filed for the reporting person on April 10, 2026.

SEC source: 0000897069-26-000189 · form4.xml · derivative · entry 2

Schreiber Amanda Justine · CIK 0002106984 · *EVP, GC, and Corp Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,277

Underlying: Common Stock · 49,277 shares

Expires not disclosed

F3 · derivative.exercise_price: Each performance share unit represents a contingent right to receive one share of common stock or the equivalent cash value upon vesting of the performance share unit.

F4 · derivative.exercise_date: On January 23, 2026, the reporting person was granted performance share units that will be earned based on the Company's total shareholder return ("TSR") performance during the fiscal year 2026, fiscal years 2026-2027 and fiscal years 2026-2028 performance periods, subject to continued employment until the third anniversary of the grant date. The number of performance share units reported is the target number; up to 235% of the target number may be earned based on TSR performance.

F4 · derivative.expiration_date: On January 23, 2026, the reporting person was granted performance share units that will be earned based on the Company's total shareholder return ("TSR") performance during the fiscal year 2026, fiscal years 2026-2027 and fiscal years 2026-2028 performance periods, subject to continued employment until the third anniversary of the grant date. The number of performance share units reported is the target number; up to 235% of the target number may be earned based on TSR performance.

SEC source: 0000897069-26-000189 · form4.xml · derivative · entry 1

Schreiber Amanda Justine · CIK 0002106984 · *EVP, GC, and Corp Secy

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,277

Underlying: Common Stock · 49,277 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock or the equivalent cash value upon vesting of the restricted stock unit.

F2 · derivative.exercise_date: On January 23, 2026, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

F2 · derivative.expiration_date: On January 23, 2026, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-000154 · form4.xml · derivative · entry 1

Hansen Cynthia L · CIK 0001629601 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,829

Underlying: Common Stock · 2,266 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000152 · form4.xml · derivative · entry 1

England James Herbert · CIK 0001437823 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,170

Underlying: Common Stock · 3,943 shares

Expires not disclosed

F1 · derivative.exercise_price: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.exercise_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

F1 · derivative.expiration_date: Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director.

SEC source: 0000897069-26-000011 · form4.xml · derivative · entry 3

Few Jason · CIK 0001408158 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,250

Underlying: Common Stock · 29,250 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units were converted into common stock on a one-for-one basis.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-000011 · form4.xml · nonDerivative · entry 2

Few Jason · CIK 0001408158 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,648

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-26-000011 · form4.xml · nonDerivative · entry 1

Few Jason · CIK 0001408158 · Director · CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,815

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

SEC source: 0000897069-26-000009 · form4.xml · derivative · entry 3

Dolger Joshua · CIK 0001868593 · General Counsel & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,250

Underlying: Common Stock · 6,250 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-000009 · form4.xml · nonDerivative · entry 2

Dolger Joshua · CIK 0001868593 · General Counsel & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,743

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-26-000009 · form4.xml · nonDerivative · entry 1

Dolger Joshua · CIK 0001868593 · General Counsel & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,702

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0000897069-26-000007 · form4.xml · derivative · entry 3

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,364

Underlying: Common Stock · 11,363 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units were converted into common stock on a one-for-one basis.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-000007 · form4.xml · nonDerivative · entry 2

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,560

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-26-000007 · form4.xml · nonDerivative · entry 1

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,122

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

SEC source: 0000897069-26-000005 · form4.xml · derivative · entry 3

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,250

Underlying: Common Stock · 6,250 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units were converted into common stock on a one-for-one basis.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 30, 2024, the reporting person was granted restricted stock units, which vest 1/2 on each of the first two anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-26-000005 · form4.xml · nonDerivative · entry 2

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,090

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-26-000005 · form4.xml · nonDerivative · entry 1

Achanta Shankar · CIK 0002051411 · EVP, Chf. Product &Tech Ofc.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,778

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

SEC source: 0000897069-25-001834 · form4.xml · nonDerivative · entry 1

Bingham Betsy B · CIK 0001896667 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: The price in Column 4 is a weighted average price. The prices actually received ranged from $8.5201 to $8.535. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range for all transactions reported in this Form 4 utilizing an average weighted price.

SEC source: 0000897069-25-001805 · form4.xml · derivative · entry 3

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,592

Underlying: Common Stock · 4,591 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 11, 2023, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 11, 2023, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-25-001805 · form4.xml · nonDerivative · entry 2

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,759

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units.

SEC source: 0000897069-25-001805 · form4.xml · nonDerivative · entry 1

Bishop Michael S. · CIK 0001523478 · EVP, TREASURER & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,198

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units were converted into common stock on a one-for-one basis.

SEC source: 0000897069-25-001803 · form4.xml · derivative · entry 3

Dolger Joshua · CIK 0001868593 · General Counsel & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,525

Underlying: Common Stock · 2,525 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units were converted into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On December 11, 2023, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

F3 · derivative.expiration_date: On December 11, 2023, the reporting person was granted restricted stock units, which vest 1/3 on each of the first, second and third anniversaries of the date of grant, subject to continued employment.

SEC source: 0000897069-25-001803 · form4.xml · nonDerivative · entry 2

Dolger Joshua · CIK 0001868593 · General Counsel & Corp Sec

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,452

F2 · kind: Represents shares withheld to satisfy tax obligations upon the vesting of restricted stock units