How can catalytic investors ensure their dollars generate impact that wouldn’t occur otherwise? Impact Frontier’s new case study highlights how a focus on additionality has allowed Prime Coalition to advance untapped climate solutions since 2014. The case study outlines Prime’s approach to additionality both in theory and practice, covering the full lifecycle of catalytic investing programs—from establishing additionality in program design, to assessing it during investment diligence, and sustaining it post-investment.