Regulation (EU) 2024/900 — in force from 10 October 2025. Requires all political advertising to be transparently disclosed in a public repository. Key obligations: Art. 7 (transparency notice), Art. 8 (public repository), Art. 10 (sponsor identification), Art. 11 (ad content disclosures including spend, targeting, funding source). Assessed against party transparency pages as of May 2026.