One Small Planet

Will Peterffy, the firm's founder and CEO, runs the overall strategy alongside Chief Investment Officer Jack Wielebinski. Will is the son of Thomas Peterffy, the founder of Interactive Brokers, and directs a portfolio that blends venture investing with direct ownership of land-based regeneration projects.

The capital originates from Thomas Peterffy, who founded and chairs Interactive Brokers, the publicly traded electronic brokerage. One Small Planet manages a portion of the family's wealth for his son Will, focusing it almost entirely on impact and ecological assets rather than the fintech sector that created the fortune.

It operates as a single-family office with the investment approach of a thesis-driven venture studio and land manager. The firm makes direct venture investments into companies like Regen Network, enters joint ventures such as Magdalena Biosciences, and directly holds land stewardship projects like the Ekvn-Yefolecv Ecovillage in Alabama and the Pumamaqui Foundation Land Project in Ecuador.

The firm appears to favor co-investment and partnership structures over passive fund commitments. Its known relationships include working alongside Gregory Landua, CEO of Regen Network, and community partners at the Ekvn-Yefolecv Ecovillage, indicating a preference for direct, collaborative engagement with founders and project operators rather than blind-pool fund allocations.

While the firm has not published formal exclusion criteria, its investment record shows a deliberate avoidance of the electronic brokerage and mainstream fintech categories that generated the family's wealth. The portfolio holds no known public equities in the brokerage sector and instead concentrates on regenerative land use, climate-focused data infrastructure, and biomedical joint ventures.

Yes, the firm operates a parallel One Small Planet Philanthropic Fund for grantmaking. The investment office and the philanthropic fund run alongside each other, with the investment side taking equity and project stakes while the fund makes non-return-seeking grants. Will Peterffy also serves as a trustee of the nonprofit Bioneers, extending the family's network in the environmental space.

Will Peterffy's trustee role at Bioneers and membership in The ImPact, a network of family offices focused on social and environmental impact, create a proprietary sourcing channel for regenerative and climate-tech investments. These peer communities provide deal-sharing, due-diligence collaboration, and co-investment opportunities that align with the firm's thesis, particularly around restorative land use and nature-based carbon solutions.