A donor-advised fund devoted to supporting the United Nations Sustainable Development Goals has leapt from being a relatively minor charity to one with an asset size comparable to behemoths like the Andrew W. Mellon and David and Lucile Packard foundations. The SDG Impact Fund, based in Cartersville, Georgia, grew from $238 million in assets in 2020 to $10 billion in 2021. The less stringent legal reporting requirements for DAFs compared with private foundations make it hard to understand SDG Impact Fund’s massive growth.