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Related Party Disclosures (Tables) | 12 Months Ended
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Jun. 30, 2025
Related party transactions [abstract] |
Summary of Consolidated Financial Statements Include Financial Statements of Opthea Limited and Subsidiaries | The consolidated financial statements include the financial statements of Opthea Limited and its subsidiaries in the following table:
|  | Parent entity % equity interest |
|  | June 30, 2025 |  | June 30, 2024 |  |  | June 30, 2023 |
|  |  |  | % |  |  | % |
Vegenics Pty Ltd 1 |  | 100 |  |  | 100 |  |  |  | 100 |
Opthea US Inc 2 |  | 100 |  |  | 100 |  |  |  | 100 |
(1) Opthea Limited is the ultimate parent entity. Vegenics Pty Ltd is incorporated in Australia and has the same financial year as Opthea Limited. (2) Opthea Limited is the ultimate parent entity. Opthea US Inc was incorporated in the United States in May 2021 and has the same financial year as Opthea Limited.
Summary of Trading Transactions with Related Parties | During the year, group entities entered into the following transactions with related parties who are not members of the Group.
|  | Consolidated |
|  | Purchase of Service |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | US$(000's) |  |  | US$(000's) |  |  | US$(000's) |
Ocelot |  |  | 32,793 |  |  |  | 24,699 |  |  |  | — |
Launch Tx |  |  | 9,900 |  |  |  | 2,700 |  |  |  | 900 |
Mr Lawrence Gozlan |  |  | 275 |  |  |  | — |  |  |  | — |
Saama Technologies |  |  | 121 |  |  |  | 343 |  |  |  | — |
Transaction with Launch Tx relate to the p opinion of the Directors, these duties are outside the scope of the ordinary duties of a Non-Executive Director.
|  | Consolidated |
|  | Amounts owed to related parties |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | US$(000's) |  |  | US$(000's) |  |  | US$(000's) |
Ocelot |  |  | — |  |  |  | 141,554 |  |  |  | 85,660 |
Launch Tx |  |  | 2,250 |  |  |  | — |  |  |  | 900 |
Lawrence Gozlan |  |  | — |  |  |  | — |  |  |  | — |
Saama Technologies |  |  | — |  |  |  | — |  |  |  | — |
|  | Consolidated |
|  | Amounts owed by related parties* |
|  | 2025 |  |  | 2024 |  |  | 2023 |
|  | US$(000's) |  |  | US$(000's) |  |  | US$(000's) |
Ocelot |  |  | — |  |  |  | — |  |  |  | — |
Launch Tx |  |  | — |  |  |  | 3,150 |  |  |  | — |
Mr. Lawrence Gozlan |  |  | — |  |  |  | — |  |  |  | — |
Saama Technologies |  |  | — |  |  |  | 24 |  |  |  | — |

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