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The transfer was exempt from reporting by SPT Holding, SARL, Siemens Pension-Trust e.V., Siemens AG and their affiliates under Rule 16a-13 of the Securities Exchange Act of 1934, as amended. Such transfer does not represent any change to the aggregate number of shares of Issuer Class A Common Stock beneficially owned by Siemens Pension-Trust e.V., Siemens AG and its subsidiaries."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Reflects shares transferred to Siemens Pension-Trust e.V., which wholly owns SPT Holding Sarl. The transfer was exempt from reporting by SPT Holding, SARL, Siemens Pension-Trust e.V., Siemens AG and their affiliates under Rule 16a-13 of the Securities Exchange Act of 1934, as amended. Such transfer does not represent any change to the aggregate number of shares of Issuer Class A Common Stock beneficially owned by Siemens Pension-Trust e.V., Siemens AG and its subsidiaries."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"These shares are directly owned by SPT Holding Sarl. SPT Holding Sarl is a wholly owned subsidiary of Siemens Pension-Trust e.V. Siemens AG is an affiliate of Siemens Pension-Trust e.V. and may be deemed to share beneficial ownership of the shares of Class A Common Stock beneficially owned by Siemens Pension-Trust e.V."}],"balance_after":1231982,"source":{"system":"sec-edgar","filing":"0001193125-26-298699","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2090032/000119312526298699/ownership.xml","form_type":"4"}},{"id":725670,"issuer":{"id":4531,"kind":"organization","name":"Fluence Energy, Inc.","symbol":"FLNC"},"owners":[{"id":35204,"kind":"person","name":"Zahurancik John","position":1,"cik":"0002003064","reported_name":"Zahurancik John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP & CCSO"}}],"security":"Class A Common Stock","published_at":"2026-06-26T20:28:57.000Z","date":"2026-06-23","kind":"sale","planned":true,"acquired":false,"shares":15974,"price":22.0257,"value":351838.5318,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to an existing Rule 10b5-1 trading plan adopted by the reporting person on March 20, 2026. The reporting person is subject to a lock-up agreement that expires at the close of business on June 26, 2026, that was entered into with the representatives of the underwriters in connection with an underwritten public offering of the Issuer's Class A common stock. The sales of shares is a permissible exemption under the terms of the lock-up agreement."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple open market transactions at prices ranging from $21.24 to $22.94, inclusive. The reporting person undertakes to provide to Fluence, any security holder of Fluence, 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 indicated in this footnote."}],"balance_after":71171,"source":{"system":"sec-edgar","filing":"0002003064-26-000006","document":"wk-form4a_1782505735.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2003064/000200306426000006/wk-form4a_1782505735.xml","form_type":"4/A","original_submission_date":"2026-06-24"}},{"id":725669,"issuer":{"id":4531,"kind":"organization","name":"Fluence Energy, Inc.","symbol":"FLNC"},"owners":[{"id":35204,"kind":"person","name":"Zahurancik John","position":1,"cik":"0002003064","reported_name":"Zahurancik John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP & CCSO"}}],"security":"Class A Common Stock","published_at":"2026-06-26T20:28:57.000Z","date":"2026-06-22","kind":"sale","planned":true,"acquired":false,"shares":16000,"price":25.179,"value":402864.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to an existing Rule 10b5-1 trading plan adopted by the reporting person on March 20, 2026. The reporting person is subject to a lock-up agreement that expires at the close of business on June 26, 2026, that was entered into with the representatives of the underwriters in connection with an underwritten public offering of the Issuer's Class A common stock. The sales of shares is a permissible exemption under the terms of the lock-up agreement."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple open market transactions at prices ranging from $24.52 to $25.63, inclusive. The reporting person undertakes to provide to Fluence Energy, Inc. 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The reporting person undertakes to provide to Fluence, any security holder of Fluence, 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 indicated in this footnote."}],"balance_after":71171,"source":{"system":"sec-edgar","filing":"0002003064-26-000004","document":"wk-form4_1782346682.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2003064/000200306426000004/wk-form4_1782346682.xml","form_type":"4"}},{"id":727881,"issuer":{"id":4531,"kind":"organization","name":"Fluence Energy, Inc.","symbol":"FLNC"},"owners":[{"id":35204,"kind":"person","name":"Zahurancik John","position":1,"cik":"0002003064","reported_name":"Zahurancik John","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP & CCSO"}}],"security":"Class A Common Stock","published_at":"2026-06-25T00:18:04.000Z","date":"2026-06-22","kind":"sale","planned":true,"acquired":false,"shares":16000,"price":25.179,"value":402864.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. 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The reporting person is subject to a lock-up agreement that expires at the close of business on June 26, 2026, that was entered into with the representatives of the underwriters in connection with an underwritten public offering of the Issuer's Class A common stock (the \"Offering\").  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The reporting person is subject to a lock-up agreement that expires at the close of business on June 26, 2026, that was entered into with the representatives of the underwriters in connection with an underwritten public offering of the Issuer's Class A common stock (the \"Offering\"). 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certain exceptions, conditions and adjustments, and have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The OpCo Units and an equal number of shares of Class B-1 Common Stock, together are exchangeable at the discretion of the holder for, at the Issuer's election, shares of Class A Common Stock on a one-for-one basis or the cash value thereof, subject to certain exceptions, conditions and adjustments, and have no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The OpCo Units are held by AES Grid Stability, LLC, which is a wholly owned subsidiary of The AES Corporation."}],"balance_after":41432781,"derivative":{"underlying":"Class A Common 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AES Grid Stability exercised such redemption right as a result of AES Grid Stability's and The AES Corporation's determination to sell 10,066,414 shares Class A Common Stock in an underwritten offering."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The OpCo Units and an equal number of shares of Class B-1 Common Stock, together are exchangeable at the discretion of the holder for, at the Issuer's election, shares of Class A Common Stock on a one-for-one basis or the cash value thereof, subject to certain exceptions, conditions and adjustments, and have no expiration date."}],"balance_after":10066414,"source":{"system":"sec-edgar","filing":"0000950103-26-007429","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/874761/000095010326007429/ownership.xml","form_type":"4"}},{"id":775243,"issuer":{"id":4531,"kind":"organization","name":"Fluence Energy, Inc.","symbol":"FLNC"},"owners":[{"id":24667,"kind":"organization","name":"Qatar Investment Authority","position":1,"cik":"0001441449","reported_name":"Qatar Investment Authority","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Class A Common Stock","published_at":"2026-05-18T13:49:41.000Z","date":"2026-05-15","kind":"sale","planned":false,"acquired":false,"shares":2867172,"price":21,"value":60210612.0,"ownership":{"direct":false,"nature":"Held by Qatar Holding LLC"},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"On May 15, 2026, Qatar Holding LLC sold shares of Class A Common Stock of the Issuer in an aggregate amount equal to $60,210,612 at $21.00 per share."},{"field":"shares","element":"transactionShares","label":"F1","text":"On May 15, 2026, Qatar Holding LLC sold shares of Class A Common Stock of the Issuer in an aggregate amount equal to $60,210,612 at $21.00 per share."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On May 15, 2026, Qatar Holding LLC sold shares of Class A Common Stock of the Issuer in an aggregate amount equal to $60,210,612 at $21.00 per share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Qatar Holding LLC is the direct holder of the securities reflected in this Form 4. Qatar Investment Authority is the ultimate parent of Qatar Holding LLC."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Qatar Holding LLC is the direct holder of the securities reflected in this Form 4. 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