Impact investing reached an inflection point in 2025 as uncertainty gripped private markets, abetted by political turbulence, fundraising difficulties and liquidity constraints.

But such uncertainty may have been necessary for impact fund managers to focus on a sharper articulation of market fundamentals, according to Rekha Unnithan, global head of private equity impact investing at Nuveen, the asset management subsidiary of retirement services firm TIAA.

An appropriate response, Unnithan argues, is not retreat, but nuance. For climate-focused investors wary of shifting policies in Washington, DC, the emphasis is on backing profitable companies that do not depend on government subsidies. For sceptics, however, it’s simple economics – companies that reduce costs, improve climate resilience and deliver real value, regardless of ideology.

While 2025 left behind a number of challenges for the impact investing market, there appear to be signs that things may improve in 2026 with transition activity picking up and capital seemingly starting to flow again.

But which themes will characterise the market in 2026? In this episode, Unnithan sits down with host Michael Bowen to discuss where the sustainable investing market may go from here.