EOSE

SEC source: 0001628280-21-018273 · wf-form4_163114380256295.xml · derivative · entry 4

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,617

Underlying: Common Stock · 9,617 shares

Expires 2026-06-17

F6 · derivative.exercise_date: The reporting person was granted an option to purchase common stock which vests on the earlier of (i) the first anniversary of the grant date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date; provided, that, the option shall vest in full upon the consummation of a change in control.

SEC source: 0001628280-21-018273 · wf-form4_163114380256295.xml · derivative · entry 3

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,762

Underlying: Common Stock · 3,762 shares

Expires not disclosed

F4 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock

F5 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the grant date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date; provided, that, the restricted stock units shall vest in full upon the consummation of a change in control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018269 · wf-form4_163114347051775.xml · derivative · entry 4

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,617

Underlying: Common Stock · 9,617 shares

Expires 2026-06-17

F6 · derivative.exercise_date: The reporting person was granted an option to purchase common stock which vests on the earlier of (i) the first anniversary of the grant date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date; provided, that, the option shall vest in full upon the consummation of a change in control.

SEC source: 0001628280-21-018269 · wf-form4_163114347051775.xml · derivative · entry 3

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,762

Underlying: Common Stock · 3,762 shares

Expires not disclosed

F4 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock

F5 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the grant date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the grant date; provided, that, the restricted stock units shall vest in full upon the consummation of a change in control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018271 · wf-form4_163114367579831.xml · derivative · entry 2

Zibelman Audrey Ann · CIK 0001833088 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,198 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.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018271 · wf-form4_163114367579831.xml · nonDerivative · entry 1

Zibelman Audrey Ann · CIK 0001833088 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

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 · shares: Restricted stock units vested

F2 · price: Convert without cost to shares of common stock on a one-for-one basis.

SEC source: 0001628280-21-018276 · wf-form4_163114409615214.xml · derivative · entry 3

Stidolph Russell Monoki · CIK 0001833275 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,198 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.

F4 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018276 · wf-form4_163114409615214.xml · nonDerivative · entry 1

Stidolph Russell Monoki · CIK 0001833275 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

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 · shares: Restricted stock units vested

F2 · price: Convert without cost to shares of common stock on a one-for-one basis.

SEC source: 0001628280-21-018274 · wf-form4_163114397261379.xml · derivative · entry 2

Shribman Daniel · CIK 0001772389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,198 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.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018274 · wf-form4_163114397261379.xml · nonDerivative · entry 1

Shribman Daniel · CIK 0001772389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 998,948

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 · shares: Restricted stock units vested

F2 · price: Convert without cost to shares of common stock on a one-for-one basis.

SEC source: 0001628280-21-018273 · wf-form4_163114380256295.xml · derivative · entry 2

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,198 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.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018273 · wf-form4_163114380256295.xml · nonDerivative · entry 1

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

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 · shares: Restricted stock units vested

F2 · price: Convert without cost to shares of common stock on a one-for-one basis.

SEC source: 0001628280-21-018269 · wf-form4_163114347051775.xml · derivative · entry 2

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,198 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.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001628280-21-018269 · wf-form4_163114347051775.xml · nonDerivative · entry 1

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,198

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 · shares: Restricted stock units vested

F2 · price: Convert without cost to shares of common stock on a one-for-one basis.

SEC source: 0001628280-21-008369 · wf-form4_161979682453797.xml · derivative · entry 1

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,737

Underlying: Common Stock · 4,737 shares

Expires 2026-04-28

F1 · price: (1)This option was granted on April 28, 2021 as an option to purchase 4,737 shares of the Issuer's common stock under the Issuer's 2020 Incentive Plan (the "Plan") at an exercise price of $14.28 per share. The option shall fully vest on the earlier of (i) the first anniversary of the Grant Date or (ii) immediately prior to the Issuer's next annual shareholders meeting following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

F1 · derivative.exercise_date: (1)This option was granted on April 28, 2021 as an option to purchase 4,737 shares of the Issuer's common stock under the Issuer's 2020 Incentive Plan (the "Plan") at an exercise price of $14.28 per share. The option shall fully vest on the earlier of (i) the first anniversary of the Grant Date or (ii) immediately prior to the Issuer's next annual shareholders meeting following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001628280-22-007896 · wf-form4_164867311475256.xml · derivative · entry 2

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

Underlying: Common Stock · 86,457 shares

Expires 2030-08-20

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.

F2 · derivative.exercise_date: On April 9, 2021, the Company acquired 51% interest in HI-POWER LLC from Holtec International. These options held by Holtech were approved for accelerated vesting immediately as part of the acquisition agreement. These options were exercised and cash for the exercise was paid at the closing of the acquisition.

F1 · ownership.nature: Represents securities held directly by Holtec International, Singh Real Estate Enterprises Inc., Tequesta Properties Inc. and HI-MED, LLC. Mr. Singh holds direct and/or indirect ownership of these entities and holds the full voting and dispositive power with respect to Holtec International, Tequesta Properties, Inc. and HI-MED, LLC.

SEC source: 0001628280-22-007896 · wf-form4_164867311475256.xml · nonDerivative · entry 1

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 2,794,709

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 · ownership.nature: Represents securities held directly by Holtec International, Singh Real Estate Enterprises Inc., Tequesta Properties Inc. and HI-MED, LLC. Mr. Singh holds direct and/or indirect ownership of these entities and holds the full voting and dispositive power with respect to Holtec International, Tequesta Properties, Inc. and HI-MED, LLC.

SEC source: 0001628280-21-006142 · wf-form4_161713859586183.xml · derivative · entry 1

Kurada Sagar · CIK 0001833526 · Chief Financial officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 200,000

Underlying: Common Stock · 200,000 shares

Expires not disclosed

F1 · derivative.exercise_price: (1)Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock.

F2 · derivative.exercise_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest as follows: 25,000 RSUs shall vest on January 3, 2022, 75,000 RSUs shall vest on January 2, 2023, and 100,000 RSUs shall vest on January 1, 2024, subject to continued service through each vesting date.

F2 · derivative.expiration_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest as follows: 25,000 RSUs shall vest on January 3, 2022, 75,000 RSUs shall vest on January 2, 2023, and 100,000 RSUs shall vest on January 1, 2024, subject to continued service through each vesting date.

SEC source: 0001628280-21-006262 · wf-form4_161722207248145.xml · derivative · entry 1

Jody Markopoulos Anne · CIK 0001854410 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,000

Underlying: Common Stock · 125,000 shares

Expires not disclosed

F1 · derivative.exercise_price: (1)Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock.

F2 · derivative.exercise_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest in three equal installments on each of the first three anniversaries of March 8, 2021, subject to continued service through each vesting date.

F2 · derivative.expiration_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest in three equal installments on each of the first three anniversaries of March 8, 2021, subject to continued service through each vesting date.

SEC source: 0001628280-21-003915 · wf-form4_161488543587751.xml · nonDerivative · entry 1

Stidolph Russell Monoki · CIK 0001833275 · Director · 10% owner

AltEnergy, LLC · CIK 0001833898 · 10% owner

AltEnergy Storage II LLC · CIK 0001833882 · 10% owner

AltEnergy Storage V LLC · CIK 0001833884 · 10% owner

AltEnergy Storage VI LLC · CIK 0001833881 · 10% owner

AltEnergy Storage Bridge LLC · CIK 0001833879 · 10% owner

AltEnergy Transmission LLC · CIK 0001833880 · 10% owner

AltEnergy Storage Bridge Phase II LLC · CIK 0001833885 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 7,135,109

F1 · kind: AltEnergy Storage Bridge Phase II, LLC and AltEnergy Storage Bridge, LLC made pro rata distributions for no consideration of an aggregate of 92,375 shares of Common Stock of the Issuer to their respective members on March 2, 2021.

F2 · ownership.nature: In addition to Russell Stidolph, a natural person ("Mr. Stidolph"), this Form 4 is being filed jointly by AltEnergy LLC, a Delaware limited liability company ("AltEnergy"); (ii) AltEnergy Storage LLC, a Delaware limited liability company ("AltEnergy I"); (iii) AltEnergy Storage II LLC, a Delaware limited liability company ("AltEnergy II"); (iv) AltEnergy Storage V LLC, a Delaware limited liability company ("AltEnergy V"); (v) AltEnergy VI LLC, a Delaware limited liability company ("AltEnergy VI"); AltEnergy Storage Bridge LLC, a Delaware limited liability company ("Bridge"); AltEnergy Transmission LLC, a Delaware limited liability company ("Transmission"); AltEnergy Storage Bridge Phase II LLC ("Bridge II" and collectively, the "Filing Persons").

F3 · ownership.nature: The shares reported in this Form 4 are shares of common stock in which Mr. Stidoloph has a pecuniary interest in that are held directly byAltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission or Bridge II. Mr. Stidolph is the managing director of AltEnergy, the managing member of each of AltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission and Bridge II, and has voting and dispositive power with respect to the securities owned by AltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission and Bridge II. Each of the Filing Persons disclaims beneficial ownership of the outstanding shares of common stock of the issuer reported herein except to the extent of its pecuniary interest therein.

SEC source: 0001628280-21-003751 · wf-form4_161472257628225.xml · derivative · entry 1

Mastrangelo Joe · CIK 0001833309 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 750,000

Underlying: Common Stock · 750,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest in three equal installments on each of January 3, 2022, January 2, 2023 and January 1, 2024, subject to continued service through each vesting date.

F2 · derivative.expiration_date: (2)The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, as amended from time to time, which will vest in three equal installments on each of January 3, 2022, January 2, 2023 and January 1, 2024, subject to continued service through each vesting date.

SEC source: 0001628280-21-018278 · wf-form4a_163114417874037.xml · derivative · entry 1

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,032

Underlying: Common Stock · 3,032 shares

Expires 2026-02-23

F1 · security: The reporting person's Form 4 filed on April 30, 2021 improperly reported that this award of stock options was made as of April 28, 2021, with the number of options and applicable exercise price calculated based on the closing price of the Issuer's common stock on April 28, 2021. The award of stock options described herein reflects the appropriate grant date, exercise price and number of awarded options.

F2 · derivative.exercise_date: This option was granted on February 23, 2021 as an option to purchase 3,032 shares of the Issuer's common stock under the Issuer's 2020 Incentive Plan (the "Plan") at an exercise price of $22.26 per share. The option shall fully vest on the earlier of (i) the first anniversary of the Grant Date or (ii) immediately prior to the Issuer's next annual shareholders meeting following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-21-009789 · ownership.xml · nonDerivative · entry 1

Stidolph Russell Monoki · CIK 0001833275 · Director · 10% owner

AltEnergy, LLC · CIK 0001833898 · 10% owner

AltEnergy Storage II LLC · CIK 0001833882 · 10% owner

AltEnergy Storage V LLC · CIK 0001833884 · 10% owner

AltEnergy Storage VI LLC · CIK 0001833881 · 10% owner

AltEnergy Storage Bridge LLC · CIK 0001833879 · 10% owner

AltEnergy Transmission LLC · CIK 0001833880 · 10% owner

AltEnergy Storage Bridge Phase II LLC · CIK 0001833885 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 7,227,484

F1 · price: The 449,559 shares of common stock of the issuer reported on this Form 4 were distributed to the reporting persons as earnout consideration pursuant that certain agreement and plan of merger, dated September 7, 2020, by and among the issuer and the other parties signatory thereto. The earnout consideration was contingent upon the price per share of the issuer's common stock exceeding certain thresholds, which thresholds were achieved as of January 21, 2021. The issuer informed the reporting persons of the number of shares issuable pursuant to the earnout as of February 11, 2021.

F2 · ownership.nature: In addition to Russell Stidolph, a natural person ("Mr. Stidolph"), this Form 4 is being filed jointly by AltEnergy LLC, a Delaware limited liability company ("AltEnergy"); (ii) AltEnergy Storage LLC, a Delaware limited liability company ("AltEnergy I"); (iii) AltEnergy Storage II LLC, a Delaware limited liability company ("AltEnergy II"); (iv) AltEnergy Storage V LLC, a Delaware limited liability company ("AltEnergy V"); (v) AltEnergy VI LLC, a Delaware limited liability company ("AltEnergy VI"); AltEnergy Storage Bridge LLC, a Delaware limited liability company ("Bridge"); AltEnergy Transmission LLC, a Delaware limited liability company ("Transmission"); AltEnergy Storage Bridge Phase II LLC ("Bridge II" and collectively, the "Filing Persons").

F3 · ownership.nature: The shares reported in this Form 4 are shares of common stock in which Mr. Stidoloph has a pecuniary interest in that are held directly by AltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission or Bridge II. Mr. Stidolph is the managing director of AltEnergy, the managing member of each of AltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission and Bridge II, and has voting and dispositive power with respect to the securities owned by AltEnergy I, AltEnergy II, AltEnergy V, AltEnergy VI, Bridge, Transmission and Bridge II. Each of the Filing Persons disclaims beneficial ownership of the outstanding shares of common stock of the issuer reported herein except to the extent of its pecuniary interest therein.

SEC source: 0001213900-21-009786 · ownership.xml · derivative · entry 1

Treece Mack · CIK 0001832743 · CSAO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 748

Underlying: Common Stock · 748 shares

Expires 2021-12-16

F1 · security: Represents a right to receive 748 shares of Common Stock of the Company on December 16, 2021, provided that if the reporting person's employment is terminated by the issuer without cause prior to the issuance date, such shares will be issued to the reporting person on such termination date.

F1 · derivative.exercise_date: Represents a right to receive 748 shares of Common Stock of the Company on December 16, 2021, provided that if the reporting person's employment is terminated by the issuer without cause prior to the issuance date, such shares will be issued to the reporting person on such termination date.

SEC source: 0001213900-21-009785 · ownership.xml · nonDerivative · entry 1

Mastrangelo Joe · CIK 0001833309 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,546

F1 · price: Common Stock grant in connection with the issuer's achievement of certain performance targets.

SEC source: 0001213900-21-009782 · ownership.xml · nonDerivative · entry 1

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 2,794,709

F1 · price: The 449,559 shares of common stock of the issuer reported on this Form 4 were distributed to the reporting persons as earnout consideration pursuant that certain agreement and plan of merger, dated September 7, 2020, by and among the issuer and the other parties signatory thereto. The earnout consideration was contingent upon the price per share of the issuer's common stock exceeding certain thresholds, which thresholds were achieved as of January 21, 2021. The issuer informed the reporting persons of the number of shares issuable pursuant to the earnout as of February 11, 2021.

F2 · ownership.nature: Represents securities held directly by Holtec International, Singh Real Estate Enterprises Inc., Tequesta Properties Inc. and HI-MED, LLC. Mr. Singh holds direct and/or indirect ownership of these entities and holds the full voting and dispositive power with respect to Holtec International, Tequesta Properties, Inc. and HI-MED, LLC.

SEC source: 0001628280-22-007894 · wf-form4a_164867301127846.xml · nonDerivative · entry 1

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 2,708,252

F1 · price: The 170,740 shares of common stock of the issuer reported on this Form 4 were distributed to the reporting persons as earnout consideration pursuant that certain agreement and plan of merger, dated September 7, 2020, by and among the issuer and the other parties signatory thereto. The earnout consideration was contingent upon the price per share of the issuer's common stock exceeding certain thresholds, which thresholds were achieved as of January 21, 2021. The issuer informed the reporting persons of the number of shares issuable pursuant to the earnout as of February 11, 2021.

F2 · ownership.nature: Represents securities held directly by Holtec International, Singh Real Estate Enterprises Inc., Tequesta Properties Inc. and HI-MED, LLC. Mr. Singh holds direct and/or indirect ownership of these entities and holds the full voting and dispositive power with respect to Holtec International, Tequesta Properties, Inc. and HI-MED, LLC.

SEC source: 0001213900-20-043791 · ownership.xml · nonDerivative · entry 1

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,000

F1 · shares: This transaction was executed in multiple trades at prices ranging from $14.38 to $14.71 per share. The price reported represents the weighted average purchase price of these trades. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer, full information regarding the shares purchased at each separate price.

SEC source: 0001213900-20-042132 · ownership.xml · derivative · entry 2

Zibelman Audrey Ann · CIK 0001833088 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,473

Underlying: Common Stock · 18,473 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042132 · ownership.xml · derivative · entry 1

Zibelman Audrey Ann · CIK 0001833088 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-042140 · ownership.xml · derivative · entry 2

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,473

Underlying: Common Stock · 18,473 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042140 · ownership.xml · derivative · entry 1

Singh Krishna Pal · CIK 0001832675 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-042138 · ownership.xml · derivative · entry 2

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,473

Underlying: Common Stock · 18,473 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042138 · ownership.xml · derivative · entry 1

Walters Marian · CIK 0001782905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-042134 · ownership.xml · derivative · entry 2

Shribman Daniel · CIK 0001772389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,788

Underlying: Common Stock · 30,788 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042134 · ownership.xml · derivative · entry 1

Shribman Daniel · CIK 0001772389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-042136 · ownership.xml · derivative · entry 2

Stidolph Russell Monoki · CIK 0001833275 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,788

Underlying: Common Stock · 30,788 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042136 · ownership.xml · derivative · entry 1

Stidolph Russell Monoki · CIK 0001833275 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-042130 · ownership.xml · derivative · entry 2

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,473

Underlying: Common Stock · 18,473 shares

Expires 2025-12-08

F4 · derivative.exercise_date: The reporting person was granted an option to purchase Common Stock which vests on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the option shall vest in full upon the consummation of a Change in Control.

SEC source: 0001213900-20-042130 · ownership.xml · derivative · entry 1

DIMITRIEF ALEXANDER · CIK 0001614732 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,198

Underlying: Common Stock · 5,198 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest on the earlier of (i) the first anniversary of the Grant Date, and (ii) immediately prior to the date of the next annual shareholders meeting of the Company following the Grant Date; provided, that, the Restricted Stock Units shall vest in full upon the consummation of a Change in Control.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-038810 · ownership.xml · derivative · entry 2

Mastrangelo Joe · CIK 0001833309 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 74,531 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: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock

F2 · derivative.exercise_date: The reporting person received restricted stock units which vest in full when the per share price of the Company's common stock quals or exceeds $12.00 at any time.

F3 · derivative.expiration_date: Not applicable.

SEC source: 0001213900-20-038810 · ownership.xml · nonDerivative · entry 1

Mastrangelo Joe · CIK 0001833309 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,531

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.

SEC source: 0001213900-20-038065 · ownership.xml · derivative · entry 15

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

B. RILEY CAPITAL MANAGEMENT, LLC · CIK 0001658704 · 10% owner

BRC Partners Management GP, LLC · CIK 0001749420 · 10% owner

BRC Partners Opportunity Fund, LP · CIK 0001642765 · 10% owner

B. Riley Securities, Inc. · CIK 0001505748 · 10% owner

RILEY BRYANT R · CIK 0001207269 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By BRC Partners Opportunity Fund, LP

Disclosed balance after: 25,000

Underlying: Class A Common Stock · 25,000 shares

Expires not disclosed

F6 · kind: BRPLP owned 50,000 of the Issuer's public units, as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-237812) (the "Registration Statement"), which automatically separated into their component securities upon the closing of the Business Combination.

F6 · price: BRPLP owned 50,000 of the Issuer's public units, as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-237812) (the "Registration Statement"), which automatically separated into their component securities upon the closing of the Business Combination.

F10 · derivative.exercise_date: The warrants will become exercisable on the later of (a) 30 days after the completion of the Business Combination or (b) 12 months from the closing of the Public Offering.

F11 · derivative.expiration_date: The Warrants will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation.

F1 · ownership.nature: BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), is a subsidiary of B. Riley Capital Management, LLC, a New York limited liability company and registered investment advisor ("BRCM"), and is the general partner of BRC Partners Opportunity Fund, LP, a Delaware limited partnership ("BRPLP"). B. Riley Financial, Inc., a Delaware corporation ("BRF"), is the parent company of BRCM. As a result, BRF, BRCM and BRPGP may be deemed to indirectly beneficially own the shares held by BRPLP. BRF is the parent company of B. Riley Securities, Inc., a Delaware corporation ("BRS"). As a result, BRF may be deemed to indirectly beneficially own the shares held by BRS. B. Riley Principal Investments, LLC ("BRPI") is the sole member of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") and is a wholly-owned subsidiary of BRF. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

F2 · ownership.nature: Bryant R. Riley is the Co-Chief Executive Officer and Chairman of the Board of Directors of BRF. As a result, Bryant R. Riley may be deemed to indirectly beneficially own the shares of Common Stock directly held by BRF, BRS, BRPLP and the Sponsor. Each of BRF, BRPGP, BRCM, BRPLP, BRS, BRPI, the Sponsor and Bryant R. Riley disclaims beneficial ownership of the outstanding shares of Common Stock reported herein, except to the extent of its/his respective pecuniary interest therein.

SEC source: 0001213900-20-038065 · ownership.xml · derivative · entry 14

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

B. RILEY CAPITAL MANAGEMENT, LLC · CIK 0001658704 · 10% owner

BRC Partners Management GP, LLC · CIK 0001749420 · 10% owner

BRC Partners Opportunity Fund, LP · CIK 0001642765 · 10% owner

B. Riley Securities, Inc. · CIK 0001505748 · 10% owner

RILEY BRYANT R · CIK 0001207269 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 325,000

Underlying: Class A Common Stock · 325,000 shares

Expires not disclosed

F3 · kind: The Sponsor owned 650,000 of the Issuer's Private Placement Units, as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-237812) (the "Registration Statement"), which automatically separated into their component securities upon the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination").

F3 · price: The Sponsor owned 650,000 of the Issuer's Private Placement Units, as described under the heading "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-237812) (the "Registration Statement"), which automatically separated into their component securities upon the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination").

F10 · derivative.exercise_date: The warrants will become exercisable on the later of (a) 30 days after the completion of the Business Combination or (b) 12 months from the closing of the Public Offering.

F11 · derivative.expiration_date: The Warrants will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation.

F1 · ownership.nature: BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), is a subsidiary of B. Riley Capital Management, LLC, a New York limited liability company and registered investment advisor ("BRCM"), and is the general partner of BRC Partners Opportunity Fund, LP, a Delaware limited partnership ("BRPLP"). B. Riley Financial, Inc., a Delaware corporation ("BRF"), is the parent company of BRCM. As a result, BRF, BRCM and BRPGP may be deemed to indirectly beneficially own the shares held by BRPLP. BRF is the parent company of B. Riley Securities, Inc., a Delaware corporation ("BRS"). As a result, BRF may be deemed to indirectly beneficially own the shares held by BRS. B. Riley Principal Investments, LLC ("BRPI") is the sole member of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") and is a wholly-owned subsidiary of BRF. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

F2 · ownership.nature: Bryant R. Riley is the Co-Chief Executive Officer and Chairman of the Board of Directors of BRF. As a result, Bryant R. Riley may be deemed to indirectly beneficially own the shares of Common Stock directly held by BRF, BRS, BRPLP and the Sponsor. Each of BRF, BRPGP, BRCM, BRPLP, BRS, BRPI, the Sponsor and Bryant R. Riley disclaims beneficial ownership of the outstanding shares of Common Stock reported herein, except to the extent of its/his respective pecuniary interest therein.

SEC source: 0001213900-20-037812 · ownership.xml · derivative · entry 3

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,221,250 shares

Expires not disclosed

F1 · derivative.exercise_price: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F1 · kind: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F2 · shares: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F1 · price: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F1 · derivative.exercise_date: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F1 · derivative.expiration_date: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F2 · derivative.underlying_shares: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F3 · ownership.nature: Represents a pro-rata distribution to the members of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") for no consideration.

F4 · ownership.nature: B. Riley Principal Investments, LLC ("BRPI") is the managing member of the Sponsor and is a wholly-owned subsidiary of B. Riley Financial, Inc. ("BRF"), a Delaware corporation. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

SEC source: 0001213900-20-037812 · ownership.xml · derivative · entry 2

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 3,221,250

Underlying: Class A Common Stock · 1,073,750 shares

Expires not disclosed

F1 · derivative.exercise_price: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F3 · kind: Represents a pro-rata distribution to the members of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") for no consideration.

F1 · price: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F1 · derivative.exercise_date: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F1 · derivative.expiration_date: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F3 · ownership.nature: Represents a pro-rata distribution to the members of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") for no consideration.

F4 · ownership.nature: B. Riley Principal Investments, LLC ("BRPI") is the managing member of the Sponsor and is a wholly-owned subsidiary of B. Riley Financial, Inc. ("BRF"), a Delaware corporation. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

SEC source: 0001213900-20-037812 · ownership.xml · nonDerivative · entry 1

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 3,221,250

F1 · kind: In connection with the closing of the business combination between Eos Energy Enterprises, Inc. (formerly known as B. Riley Principal Merger Corp. II or "BMRG") and Eos Energy Storage LLC (the "Business Combination"), among other things, each share of BMRG's Class B common stock converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc.

F2 · shares: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F2 · balance_after: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F3 · ownership.nature: Represents a pro-rata distribution to the members of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") for no consideration.

F4 · ownership.nature: B. Riley Principal Investments, LLC ("BRPI") is the managing member of the Sponsor and is a wholly-owned subsidiary of B. Riley Financial, Inc. ("BRF"), a Delaware corporation. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

SEC source: 0001213900-20-037808 · ownership.xml · nonDerivative · entry 1

Shribman Daniel · CIK 0001772389 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 993,750

F1 · kind: 993,750 shares of common stock acquired by the Reporting Person and reported herein were received in a pro rata distribution by B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") to its members in connection with the business combination (the "Business Combination") between the Issuer (formerly known as B. Riley Principal Merger Corp. II, or "BMRG") and Eos Energy Storage LLC on November 16, 2020.

F2 · shares: 397,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F2 · balance_after: 397,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

SEC source: 0001213900-20-038065 · ownership.xml · derivative · entry 13

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

B. RILEY CAPITAL MANAGEMENT, LLC · CIK 0001658704 · 10% owner

BRC Partners Management GP, LLC · CIK 0001749420 · 10% owner

BRC Partners Opportunity Fund, LP · CIK 0001642765 · 10% owner

B. Riley Securities, Inc. · CIK 0001505748 · 10% owner

RILEY BRYANT R · CIK 0001207269 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,221,250 shares

Expires not disclosed

F5 · derivative.exercise_price: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F5 · kind: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F4 · shares: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F5 · price: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F5 · derivative.exercise_date: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F5 · derivative.expiration_date: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F4 · derivative.underlying_shares: 1,288,500 of such shares are subject to the earnout restrictions set forth in the Sponsor Earnout Letter that was entered into on November 16, 2020, by and between BMRG and the Sponsor, in connection with the Business Combination.

F1 · ownership.nature: BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), is a subsidiary of B. Riley Capital Management, LLC, a New York limited liability company and registered investment advisor ("BRCM"), and is the general partner of BRC Partners Opportunity Fund, LP, a Delaware limited partnership ("BRPLP"). B. Riley Financial, Inc., a Delaware corporation ("BRF"), is the parent company of BRCM. As a result, BRF, BRCM and BRPGP may be deemed to indirectly beneficially own the shares held by BRPLP. BRF is the parent company of B. Riley Securities, Inc., a Delaware corporation ("BRS"). As a result, BRF may be deemed to indirectly beneficially own the shares held by BRS. B. Riley Principal Investments, LLC ("BRPI") is the sole member of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") and is a wholly-owned subsidiary of BRF. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

F2 · ownership.nature: Bryant R. Riley is the Co-Chief Executive Officer and Chairman of the Board of Directors of BRF. As a result, Bryant R. Riley may be deemed to indirectly beneficially own the shares of Common Stock directly held by BRF, BRS, BRPLP and the Sponsor. Each of BRF, BRPGP, BRCM, BRPLP, BRS, BRPI, the Sponsor and Bryant R. Riley disclaims beneficial ownership of the outstanding shares of Common Stock reported herein, except to the extent of its/his respective pecuniary interest therein.

SEC source: 0001213900-20-038065 · ownership.xml · derivative · entry 12

B. Riley Financial, Inc. · CIK 0001464790 · 10% owner

B. Riley Principal Sponsor Co. II, LLC · CIK 0001811637 · 10% owner

B. RILEY PRINCIPAL INVESTMENTS, LLC · CIK 0001776226 · 10% owner

B. RILEY CAPITAL MANAGEMENT, LLC · CIK 0001658704 · 10% owner

BRC Partners Management GP, LLC · CIK 0001749420 · 10% owner

BRC Partners Opportunity Fund, LP · CIK 0001642765 · 10% owner

B. Riley Securities, Inc. · CIK 0001505748 · 10% owner

RILEY BRYANT R · CIK 0001207269 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By B. Riley Principal Sponsor Co. II, LLC

Disclosed balance after: 3,221,250

Underlying: Class A Common Stock · 1,073,750 shares

Expires not disclosed

F5 · derivative.exercise_price: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F9 · kind: Represents a pro-rata distribution to the members of the Sponsor for no consideration.

F9 · price: Represents a pro-rata distribution to the members of the Sponsor for no consideration.

F5 · derivative.exercise_date: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F5 · derivative.expiration_date: In connection with the Business Combination, among other things, each share of BMRG's Class B common stock (as described under the heading "Description of Securities" in the Registration Statement) converted into shares of BMRG's Class A common stock on a one-for-one basis and subsequently, each share of BMRG's Class A common stock was reclassified as a share of common stock of Eos Energy Enterprises, Inc. (or "EOSE").

F1 · ownership.nature: BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), is a subsidiary of B. Riley Capital Management, LLC, a New York limited liability company and registered investment advisor ("BRCM"), and is the general partner of BRC Partners Opportunity Fund, LP, a Delaware limited partnership ("BRPLP"). B. Riley Financial, Inc., a Delaware corporation ("BRF"), is the parent company of BRCM. As a result, BRF, BRCM and BRPGP may be deemed to indirectly beneficially own the shares held by BRPLP. BRF is the parent company of B. Riley Securities, Inc., a Delaware corporation ("BRS"). As a result, BRF may be deemed to indirectly beneficially own the shares held by BRS. B. Riley Principal Investments, LLC ("BRPI") is the sole member of B. Riley Principal Sponsor Co. II, LLC (the "Sponsor") and is a wholly-owned subsidiary of BRF. BRPI and BRF may be deemed to indirectly beneficially own the shares held by the Sponsor.

F2 · ownership.nature: Bryant R. Riley is the Co-Chief Executive Officer and Chairman of the Board of Directors of BRF. As a result, Bryant R. Riley may be deemed to indirectly beneficially own the shares of Common Stock directly held by BRF, BRS, BRPLP and the Sponsor. Each of BRF, BRPGP, BRCM, BRPLP, BRS, BRPI, the Sponsor and Bryant R. Riley disclaims beneficial ownership of the outstanding shares of Common Stock reported herein, except to the extent of its/his respective pecuniary interest therein.