Cite the ISI

Drazsky, S., & International Sovereignty Institute. (2026, February). External Supplier Concentration — EU-27 Founding Cohort. Zenodo. https://isi.internationalsovereignty.org (accessed March 21, 2026).

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International Sovereignty Index

International Sovereignty Index · Founding cohort: EU-27 · HHI framework

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EU-27 Cohort
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All scores and classifications are computed server-side from documented data sources. The interface displays published outputs without transformation.

The EU-27 constitutes the founding release cohort. Additional sovereign entities will be incorporated in subsequent versions.

Overview EU-27 Compare Simulate