Cerberus Capital Management II, L.P.

SEC source: 0000950170-25-009096 · ownership.xml · derivative · entry 1

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 16.1505

Underlying: Common Stock · 16,150,528 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the credit and guaranty agreement, dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto (the "Lenders"), and CCM Denali Debt Holdings, LP, as administrative agent and collateral agent, which was subsequently amended by that certain omnibus amendment entered into on November 26, 2024 (as amended, the "Credit Agreement"), and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), on January 23, 2025, the Issuer submitted a borrowing request under the Credit Agreement, and on January 24, 2025, the Lenders funded the full amount of the scheduled $40.5 million delayed draw term loan under the Credit Agreement, and in connection with such draw and pursuant to the terms and conditions of the Credit Agreement and Securities Purchase Agreement,

F2 · derivative.exercise_price: (Continued from footnote 1) the Issuer issued 16.150528 shares of a newly designated Series B-4 Non-Voting Convertible Preferred Stock (the "Series B-4 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-4 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-4 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-4 Preferred Stock as further described in the Certificate of Designation for the Series B-4 Non-Voting Convertible Preferred Stock.

F1 · price: Pursuant to the credit and guaranty agreement, dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto (the "Lenders"), and CCM Denali Debt Holdings, LP, as administrative agent and collateral agent, which was subsequently amended by that certain omnibus amendment entered into on November 26, 2024 (as amended, the "Credit Agreement"), and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), on January 23, 2025, the Issuer submitted a borrowing request under the Credit Agreement, and on January 24, 2025, the Lenders funded the full amount of the scheduled $40.5 million delayed draw term loan under the Credit Agreement, and in connection with such draw and pursuant to the terms and conditions of the Credit Agreement and Securities Purchase Agreement,

F2 · price: (Continued from footnote 1) the Issuer issued 16.150528 shares of a newly designated Series B-4 Non-Voting Convertible Preferred Stock (the "Series B-4 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-4 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-4 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-4 Preferred Stock as further described in the Certificate of Designation for the Series B-4 Non-Voting Convertible Preferred Stock.

F2 · derivative.exercise_date: (Continued from footnote 1) the Issuer issued 16.150528 shares of a newly designated Series B-4 Non-Voting Convertible Preferred Stock (the "Series B-4 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-4 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-4 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-4 Preferred Stock as further described in the Certificate of Designation for the Series B-4 Non-Voting Convertible Preferred Stock.

F2 · derivative.expiration_date: (Continued from footnote 1) the Issuer issued 16.150528 shares of a newly designated Series B-4 Non-Voting Convertible Preferred Stock (the "Series B-4 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-4 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-4 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-4 Preferred Stock as further described in the Certificate of Designation for the Series B-4 Non-Voting Convertible Preferred Stock.

F3 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F4 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-120903 · ownership.xml · derivative · entry 1

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 38.2599

Underlying: Common Stock · 38,259,864 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto (the "Lenders"), and CCM Denali Debt Holdings, LP, as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), on October 31, 2024, the Issuer submitted a borrowing request under the Credit Agreement, and on November 1, 2024, the Lenders funded the full amount of the scheduled $65 million delayed draw term loan under the Credit Agreement, and in connection with such draw and pursuant to the terms and conditions of the Credit Agreement and Securities Purchase Agreement,

F2 · derivative.exercise_price: (Continued from footnote 1) the Issuer issued 38.259864 shares of a newly designated Series B-3 Non-Voting Convertible Preferred Stock (the "Series B-3 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-3 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-3 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-3 Preferred Stock as further described in the Certificate of Designation for the Series B-3 Non-Voting Convertible Preferred Stock.

F1 · price: Pursuant to the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto (the "Lenders"), and CCM Denali Debt Holdings, LP, as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), on October 31, 2024, the Issuer submitted a borrowing request under the Credit Agreement, and on November 1, 2024, the Lenders funded the full amount of the scheduled $65 million delayed draw term loan under the Credit Agreement, and in connection with such draw and pursuant to the terms and conditions of the Credit Agreement and Securities Purchase Agreement,

F2 · price: (Continued from footnote 1) the Issuer issued 38.259864 shares of a newly designated Series B-3 Non-Voting Convertible Preferred Stock (the "Series B-3 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-3 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-3 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-3 Preferred Stock as further described in the Certificate of Designation for the Series B-3 Non-Voting Convertible Preferred Stock.

F2 · derivative.exercise_date: (Continued from footnote 1) the Issuer issued 38.259864 shares of a newly designated Series B-3 Non-Voting Convertible Preferred Stock (the "Series B-3 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-3 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-3 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-3 Preferred Stock as further described in the Certificate of Designation for the Series B-3 Non-Voting Convertible Preferred Stock.

F2 · derivative.expiration_date: (Continued from footnote 1) the Issuer issued 38.259864 shares of a newly designated Series B-3 Non-Voting Convertible Preferred Stock (the "Series B-3 Preferred Stock") to Cerberus Denali Equity. Each full share of Series B-3 Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement). Convertibility of the shares of Series B-3 Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B-3 Preferred Stock as further described in the Certificate of Designation for the Series B-3 Non-Voting Convertible Preferred Stock.

F3 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F4 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 8

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 28.8065

Underlying: Common Stock · 28,806,463 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: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 7

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 31.9401

Underlying: Common Stock · 31,940,063 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: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 6

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Series B-2 Non-Voting Convertible Preferred Stock · 28.8065 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: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.exercise_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.expiration_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.expiration_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 5

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

Underlying: Series B-1 Non-Voting Convertible Preferred Stock · 31.9401 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: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · price: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · price: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · price: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.exercise_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.expiration_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.expiration_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 4

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 7

Underlying: Series B-2 Non-Voting Convertible Preferred Stock · 28.8065 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F1 · derivative.exercise_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.expiration_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.expiration_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · derivative · entry 3

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 59

Underlying: Series B-1 Non-Voting Convertible Preferred Stock · 31.9401 shares

Expires not disclosed

F1 · derivative.exercise_price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F1 · derivative.exercise_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.exercise_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.exercise_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.exercise_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.exercise_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F1 · derivative.expiration_date: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · derivative.expiration_date: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F3 · derivative.expiration_date: On September 12, 2024, (i) the 59 shares of Series A-1 Preferred Stock held by CCM Denali Equity converted into 31.940063 shares of Series B-1 Preferred Stock, which shares of Series B-1 Preferred Stock were convertible into an aggregate of 31,940,063 shares of Common Stock, and (ii) the 7 shares of Series A-2 Preferred Stock held by CCM Denali Equity converted into 28.806463 shares of Series B-2 Preferred Stock, which shares of Series B-2 Preferred Stock were convertible into an aggregate of 28,806,463 shares of Common Stock. The Series B-1 Preferred Stock has an original issue price of $841,999.99 (the "B-1 Original Issue Price") and the Series B-2 Preferred Stock has an original issue price of $2,322,000 (the "B-2 Original Issue Price"). Each full share of Series B Preferred Stock is initially convertible into 1.0 million shares of Common Stock and will be convertible at the option of the holder at any time through the Maturity Date (as defined in the Credit Agreement).

F4 · derivative.expiration_date: (Continued from footnote 3) Convertibility of the shares of Series B Preferred Stock is subject to a beneficial ownership limitation of 49.9% of the number of shares of Common Stock that would be outstanding immediately after giving effect to any conversion of the shares of Series B Preferred Stock as further described in the Certificates of Designation for the Series B-1 Preferred Stock and Series B-2 Preferred Stock. At any time after June 21, 2029, in the case of the Series B-1 Preferred Stock, or August 29, 2029, in the case of the Series B-2 Preferred Stock, the outstanding shares of Series B Preferred Stock held by any holder become redeemable for cash at the redemption price. The redemption price will be an amount per share equal to the greater of (i) the B-1 Original Issue Price or B-2 Original Issue Price, as applicable, plus all accrued and unpaid dividends thereon,

F5 · derivative.expiration_date: (Continued from footnote 4) up to and including the date of redemption and (ii) the number of shares of Common Stock issuable upon conversion of the applicable Series B Preferred Stock multiplied by the average of the closing sale price of the Common Stock for the five business days immediately prior to the date of redemption plus all accrued and unpaid dividends thereon, up to and including the date of redemption. Subject to certain excluded issuances, the Series B Preferred Stock is subject to anti-dilution protection in the number of shares of Common Stock issuable upon conversion.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · nonDerivative · entry 2

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-106014 · ownership.xml · nonDerivative · entry 1

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 0

F1 · price: As previously disclosed, pursuant to the terms of the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto, and CCM Denali Debt Holdings, LP., as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), the Issuer issued (i) 59 shares of Series A-1 Non-Voting Non-Convertible Preferred Stock (the "Series A-1 Preferred Stock") and (ii) 7 shares of Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024 ("Stockholder Approval") were obtained,

F2 · price: (Continued from footnote 1) the shares of Series A-1 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-1 Non-Voting Convertible Preferred Stock ("Series B-1 Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-1 Preferred Stock and the shares of Series A-2 Preferred Stock issued prior to Stockholder Approval would become convertible into a number of shares of Series B-2 Non-Voting Convertible Preferred Stock ("Series B-2 Preferred Stock", and together with the Series B-1 Preferred Stock, the "Series B Preferred Stock") that would be convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock. On September 10, 2024, the Issuer held a Special Meeting of Stockholders and obtained the Stockholder Approval.

F6 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F7 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.

SEC source: 0000950170-24-102928 · ownership.xml · nonDerivative · entry 1

Cerberus Capital Management II, L.P. · CIK 0002027951 · Director · 10% owner

CCM Denali Equity Holdings, LP · CIK 0002027945 · Director · 10% owner

CCM Denali Equity Holdings GP, LLC · CIK 0002027946 · Director · 10% owner

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

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnotes

Disclosed balance after: 7

F1 · price: Pursuant to the credit and guaranty agreement (the "Credit Agreement"), dated June 21, 2024, by and among Eos Energy Enterprises, Inc. (the "Issuer"), as borrower, the guarantors party thereto, the various lenders party thereto (the "Lenders"), and CCM Denali Debt Holdings, LP, as administrative agent and collateral agent, and the Securities Purchase Agreement (the "Securities Purchase Agreement"), dated June 21, 2024, by and between the Issuer and CCM Denali Equity Holdings, LP ("CCM Denali Equity"), on August 29, 2024, the Issuer submitted a borrowing request under the Credit Agreement, the Lenders funded the full amount of the scheduled $30 million delayed draw term loan under the Credit Agreement, and in connection with such draw and pursuant to the terms and conditions of the Credit Agreement and Securities Purchase Agreement,

F2 · price: (Continued from footnote 1) the Issuer issued 7 shares of a newly designated Series A-2 Non-Voting Non-Convertible Preferred Stock (the "Series A-2 Preferred Stock") to Cerberus Denali Equity, with the number of shares of such series having a liquidation value as if such shares were convertible into an aggregate of 28,806,463 shares of common stock, par value $0.0001 per share (the "Common Stock") of the Issuer. If stockholder approval of the issuance to Cerberus Denali Equity of more than 19.99% of the Issuer's outstanding Common Stock as of June 21, 2024, is obtained, the Series A-2 Preferred Stock will be convertible into a number of shares of Series B-2 Preferred Stock that are convertible into an equal number of shares of Common Stock as then represented by the liquidation value of the Series A-2 Preferred Stock.

F3 · ownership.nature: The securities of the Issuer reported herein are held directly by CCM Denali Equity. CCM Denali Equity Holdings GP, LLC ("CCM Denali Equity GP") is the general partner of CCM Denali Equity. Cerberus Capital Management II, L.P. ("Cerberus Capital Management II", and together with CCM Denali Equity and CCM Denali Equity GP, the "Reporting Persons") is the sole member of CCM Denali Equity GP. Due to their relationships with CCM Denali Equity, CCM Denali Equity GP and Cerberus Capital Management II may be deemed to indirectly beneficially own the securities of the Issuer held directly by CCM Denali Equity.

F4 · ownership.nature: Each of CCM Denali Equity GP and Cerberus Capital Management II disclaims beneficial ownership of the securities of the Issuer held directly by CCM Denali Equity except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that any of CCM Denali Equity GP or Cerberus Capital Management II is the beneficial owner of such securities for purposes of Section 16 or any other purpose.