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Denny Sanford, a billionaire philanthropist who donated nearly $2 billion to health care and community projects, died at age 90, according to an announcement on July 18, 2026, by Sanford Health, First PREMIER Bank, and PREMIER Bankcard.
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Sanford built his fortune in banking and became widely known for his transformative gifts to the Upper Midwest health system that bears his name, as well as funding initiatives across Sioux Falls and South Dakota.
Philanthropic Legacy
His philanthropic career took off in 2007 with a $400 million gift to cure Type 1 diabetes, following earlier contributions to Sioux Valley Hospital.
He also supported the State Theater, Great Plains Zoo, Jacobson Plaza, and the University of South Dakota School of Medicine, and funded a $50 million land purchase from Smithfield Foods for Foundation Park.
"Denny always said he wanted to live a life of significance and gave generously.
His philanthropy impacted millions of lives and transformed the landscape of South Dakota and beyond," said a joint statement from Sanford Health, First PREMIER Bank, and PREMIER Bankcard.
Bill Gassen, president and CEO of Sanford Health, said: "We are forever blessed that Denny chose us and our communities to make the transformational gifts that will change lives for generations.
He was a driving force in modern medicine, empowering researchers and clinicians to think big."
Dana Dykhouse, CEO of First PREMIER Bank, noted Sanford's personal drive: "Denny’s passion for helping people and inspiring others to do the same is unmatched.
