Inside Philanthropy - Who Signed the Giving Pledge in 2025

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 Credit: New Africa/Shutterstock Fifteen years ago, megabillionaires Bill Gates, Melinda French Gates and Warren Buffett launched the Giving Pledge, in which the richest philanthropists in the world promise to give away most of their wealth to charitable causes either during their lifetimes or upon death. This year, 14 new pledgers have signed on. 

 Although some of the shine has worn off the commitment, especially as billionaires have collectively grown far more wealthy without increasing their philanthropic funding at the same rate, it’s still worth looking at which individuals and couples have committed to giving away their fortunes. 

 As we recently reported in Inside Philanthropy’s special series on giving in a new Gilded Age , living megadonors will loom ever larger in American society (and around the world) in the coming years. The Giving Pledge may be an imperfect indicator of who will actually give the most, and how they’ll do it, but it remains the top organizing effort among the world’s richest people to push themselves and each other to do more philanthropically. The Giving Pledge letters also form an evolving discourse on how major living donors publicly define and interpret philanthropy, which can offer useful insights as their sway increases.

 Here are the Giving Pledgers who signed on in 2025.

 Cameron Adams and Lisa Miller

 Canva cofounder Cameron Adams and his wife, Lisa Miller, signed the pledge earlier this year, joining fellow Canva cofounders Mel Perkins and Cliff Obrecht, both of whom signed back in 2021. Adams and Miller’s philanthropy, which flows through the Wedgetail Foundation, has largely focused on protecting and restoring biodiversity and supporting the communities that are on the front line of conservation. In their Giving Pledge letter , Adams and Miller said they would be directing the majority of their wealth toward this work.

 Noubar Afeyan and Anna Afeyan Gunnarson

 Noubar Afeyan is the founder and CEO of the life sciences innovation firm Flagship Pioneering, through which he cofounded Moderna and other biotech, life sciences and health companies. He and his wife, Anna Afeyan Gunnarson, established the Afeyan Foundation in 2000, which accounts for some of their giving. They also provide financial support through other vehicles , including a DAF held at Morgan Stanley. In their Giving Pledge letter , the couple wrote that committing to the Giving Pledge is “a natural extension of [their] lifelong work,” which includes supporting organizations and initiatives focused on education, science and technology, health and humanitarian action.

 Seemay Chou and Jed McCaleb

 Crypto billionaire Jed McCaleb and his wife Seemay Chou cofounded the R&D company Arcadia Science (Chou serves as its CEO) and the Astera Institute, an AI-focused nonprofit. To

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