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Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the \"Rights Offering\"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier. If a warrant is not exercised or redeemed before it expires, it will have no value."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Warrants became exercisable immediately after the Rights Offering closed and expire 10 years later, unless exercised or redeemed earlier. If a warrant is not exercised or redeemed before it expires, it will have no value."}],"balance_after":1134,"derivative":{"exercise_price":5.48,"underlying":"Common Stock","underlying_shares":1134},"source":{"system":"sec-edgar","filing":"0001628280-26-053891","document":"wk-form4_1786017930.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026053891/wk-form4_1786017930.xml","form_type":"4"}},{"id":694435,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Subscription Rights (right to buy)","published_at":"2026-08-06T12:05:32.000Z","date":"2026-07-21","kind":"exercise","planned":false,"acquired":false,"shares":2585,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the \"Rights Offering\"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the \"Rights Offering\"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share."}],"balance_after":0,"derivative":{"exercise_price":5.48,"expiration_date":"2026-07-21","underlying":"Common Stock","underlying_shares":2585},"source":{"system":"sec-edgar","filing":"0001628280-26-053891","document":"wk-form4_1786017930.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026053891/wk-form4_1786017930.xml","form_type":"4"}},{"id":694434,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Common Stock","published_at":"2026-08-06T12:05:32.000Z","date":"2026-07-21","kind":"exercise","planned":false,"acquired":true,"shares":2585,"price":5.48,"value":14165.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents the conversion of a subscription right issued by the Issuer as part of a rights offering that closed on July 21, 2026 (the \"Rights Offering\"). Each subscription right was exercisable for units that consisted of (i) 1 share of common stock and (ii) 0.4388 of a warrant exercisable to acquire a share of common stock at an exercise price of $5.48 per share."}],"balance_after":61827,"source":{"system":"sec-edgar","filing":"0001628280-26-053891","document":"wk-form4_1786017930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026053891/wk-form4_1786017930.xml","form_type":"4"}},{"id":723010,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Restricted Stock Units","published_at":"2026-06-30T21:07:03.000Z","date":"2026-06-26","kind":"exercise","planned":true,"acquired":false,"shares":22938,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F4","text":"The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three equal installments on each of the first three anniversaries of the grant date, subject to continued service through each vesting date."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"Not applicable."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"Not applicable."}],"balance_after":45876,"derivative":{"underlying":"Common Stock","underlying_shares":22938},"source":{"system":"sec-edgar","filing":"0001628280-26-046290","document":"wk-form4_1782853620.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026046290/wk-form4_1782853620.xml","form_type":"4"}},{"id":723009,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Common Stock","published_at":"2026-06-30T21:07:03.000Z","date":"2026-06-30","kind":"sale","planned":true,"acquired":false,"shares":11469,"price":5.87,"value":67323.03,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected automatically pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 11, 2025 to cover estimated tax withholding obligations in connection with the vesting of restricted stock units."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.68 to $6.15, inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above."}],"balance_after":59242,"source":{"system":"sec-edgar","filing":"0001628280-26-046290","document":"wk-form4_1782853620.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026046290/wk-form4_1782853620.xml","form_type":"4"}},{"id":723008,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Common Stock","published_at":"2026-06-30T21:07:03.000Z","date":"2026-06-26","kind":"exercise","planned":true,"acquired":true,"shares":22938,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of common stock."}],"balance_after":70711,"source":{"system":"sec-edgar","filing":"0001628280-26-046290","document":"wk-form4_1782853620.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828026046290/wk-form4_1782853620.xml","form_type":"4"}},{"id":980546,"issuer":{"id":4901,"kind":"organization","name":"Eos Energy Enterprises, Inc.","symbol":"EOSE"},"owners":[{"id":19603,"kind":"person","name":"Buczkowski Michelle","position":1,"cik":"0002096705","reported_name":"Buczkowski Michelle","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Administration Officer"}}],"security":"Restricted Stock Units","published_at":"2025-12-04T22:28:57.000Z","date":"2025-12-02","kind":"grant","planned":false,"acquired":true,"shares":234742,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person received a grant of RSUs under the Issuer's 2020 Incentive Plan, which will vest in three equal installments on each of the first three anniversaries of the grant date, subject to\ncontinued service through each vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Not applicable."}],"balance_after":234742,"derivative":{"underlying":"Common Stock","underlying_shares":234742},"source":{"system":"sec-edgar","filing":"0001628280-25-055433","document":"wk-form4_1764887335.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2096705/000162828025055433/wk-form4_1764887335.xml","form_type":"4"}}]}