Operational Implications of the EU's Market Integration and Supervision Package for Custody and Settlement
On December 4, 2025 the European Commission published the Market Integration and Supervision Package: a Master Regulation, a Master Directive and a proposed Settlement Finality Regulation that together amend 19 pieces of EU financial services legislation. It is the most consequential post-trade legislative proposal since CSDR. Nothing in it is law, several provisions will not survive negotiation in their published form, and the direction of travel is nonetheless set.
The provision carrying the largest custody consequence is the quietest one. The Settlement Finality Directive of 1998 is the legal bedrock under every settlement system, every CCP and every custody chain in Europe, and because it was transposed nationally, member states differ on who counts as a participant and on whether indirect participants benefit from settlement protection at all. The custody chain is mostly made of indirect participants. Converting that directive into a directly applicable regulation with a harmonized participant scope collapses the divergence, and sends every legal opinion and procedure that references it back for a refresh.
Exposure differs sharply by seat. Market infrastructures face the existential questions of designation and mandatory T2S connectivity. Custodians face a quieter restructuring of network design and asset protection. Managers and the platforms distributing their funds gain from passport-at-authorization. US operations are not spectators either: sub-custody networks, third-country participation in DTC, NSCC, FICC and Fedwire, and UCITS distribution all sit inside MISP's reach.
Selected Conclusions
• The Settlement Finality Regulation is the sleeper. Harmonized indirect-participant protection and uniform conflict-of-law rules are the largest legal-certainty change to the custody model in a generation, paid for with a market-by-market opinion refresh.
• T2S connectivity stops being optional. The amended Article 40 turns a commercial choice into a regulatory default for euro settlement, and the burden falls on the holdouts and non-euro CSDs rather than the 24 depositories already connected.
• US operations are inside the perimeter. Sub-custody networks, third-country participation in DTC, NSCC, FICC and Fedwire, and UCITS distribution through US-owned platforms all put US firms inside MISP's reach.
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