On behalf of the European Commission and the Government of Norway, the Informal Stake- and Rightsholders' Exchange on the DSI Multilateral Mechanism and its Cali Fund was organized by the DSI Informal Dialogue Partnership. The Exchange was held at Hotel Martin’s Klooster in Leuven, Belgium, from 21st to 23rd September 2026. The Informal DSI Exchange, held ahead of CBD COP17, brought together stakeholders, rightsholders and negotiators to move the discussion on the Multilateral Mechanism (MLM) and Cali Fund from broad principles towards practical implementation. Participants recognised that Decision 16/2 provides the basic framework and that good progress has been made on institutional and procedural elements, but also identified unresolved legal, conceptual and operational questions that need further work. Proposed solution pathways adress (1) certificates of compliance, (2) a practical self-assessment/decision-tree tool for users, (3) proportionality regarding contributions and allocations, and (4) a structured intersessional testing phase. At the 23rd stake- and rightsholders had the opportunity to meet with the participants of the Negotiator’s Dialogue who were meeting from the 24th to the 25th of September at the same venue (see separate report) to discuss and elaborate on outstanding issues.