A pivotal moment in the fight against plastic pollution is here. From 25 November to 1 December 2024, global leaders will convene at the 5th Intergovernmental Negotiating Committee (INC-5) in Busan, Republic of Korea, to finalize a UN treaty on plastic pollution. Among the critical issues to address is how to mobilize the financing needed to implement this treaty effectively — and the role of private finance is central to this discussion. This paper provides a comprehensive framework for how private finance can help transition to a circular economy for plastics and how the UN Treaty can enable this transformation.