While AFP does not disclose its funding sources, some supporters have acknowledged their contributions and investigative journalism has documented others. AFP has been funded by the Kochs and others.
At AFP's 2009 Defending the Dream summit, David Koch said he and his brother Charles provided the initial funding for AFP.In initial fund ing, David Koch was the top contributor to the founding of the AFP Foundation at $850,000.Several American companies also provided initial funding of the AFP Foundation, including $275,000 from State Farm Insurance and lesser amounts from 1-800 Contacts, medical products firm Johnson & Johnson, and carpet and flooring manufacturer Shaw Industries.
Later grants from the Koch family foundations include $1 million in 2008 to AFP from the David H. Koch Charitable Foundation and $3 million between 2005 and 2007 to the AFP Foundation from the Claude R. Lambe Charitable Foundation, controlled by Charles Koch. Other grants from Koch-related funding sources include $32.3 million in 2012 and $1.5 million in 2013 from Freedom Partners and $4.2 million through 2011 to the AFP Foundation from the Center to Protect Patient Rights
Between 2003 and 2012, the AFP Foundation received $4.17 million from the John William Pope Foundation, chaired by AFP director Pope, the largest identifiable donor to the AFP Foundation.In 2011, the AFP Foundation received $3 million from the foundation of the family of billionaire Richard DeVos, the founder of Amway, making the DeVos family the second largest identifiable donor to the AFP Foundation. In 2010, AFP received half a million dollars from the Bradley Foundation. AFP received smaller grants in 2012 from tobacco company Reynolds American and in 2010 and 2012 from the American Petroleum Institute. The donor-advised fund Donors Trust granted $11 million to AFP between 2002 and 2010 and $7 million to the AFP Foundation in 2010.