Until recently, the UK and EU post-Brexit market abuse regimes remained substantially aligned. However, the passing of the EU Listing Act reforms in 2024 has meant that UK and EU MAR have started to diverge meaningfully for the first time and we must now start to consider them as separate regimes. Although most of the changes to EU MAR took effect in late 2024, arguably the most impactful amendment (to when issuers need to announce inside information in certain circumstances) will not take effect until mid-2026.
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