Python script finds a company's subsidiaries using free GLEI data, no API key needed

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The article explains how to find which entities list a given company as their parent using the Global LEI Index, a free source that requires no API key. It shows a raw curl command querying direct children of Deutsche Bank AG and notes that results are paged and that the ultimate-children level covers the whole group. It warns that missing parent data may reflect a reporting exception, which should be kept distinct from a company having no parent. The author shares a Python function that handles paging and a sample of results from October 2026. The article also promotes a paid Apify Actor built on the same approach, which the author says is not affiliated with GLEIF.

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