* [[John M. Olin Foundation]]: $2,000 (1992)<ref>Media Transparency, [http://web.archive.org/web/20100615134301/http://mediamattersaction.org/transparency/organization/John_M_Olin_Foundation/grants John M. Olin Foundation: Grants], research website, archived by the WayBack Machine on June 15, 2010.</ref>
* Ruth and Lovett Peters Foundation (family foundation of Pioneer's founder, Lovett Peters, with money made in energy industry): $423,100 (1999-2011)<ref>Ruth and Lovett Peters Foundation, [http://www.guidestar.org/FinDocuments/1999/046/748/1999-046748820-1-F.pdf 1999 Form 990], foundation's IRS filing, August 15, 2000.</ref><ref>Ruth and Lovett Peters Foundation, [http://www.guidestar.org/FinDocuments/2007/046/748/2007-046748820-03f6a004-F.pdf 2007 Form 990], foundation's IRS filing, May 5, 2008.</ref><ref>Lovett and Ruth Peters Foundation, [http://www.guidestar.org/FinDocuments/2009/208/934/2009-208934367-06801598-F.pdf 2008 Form 990], foundation's IRS filing, November 4, 2010.</ref><ref>Lovett and Ruth Peters Foundation, [http://www.guidestar.org/FinDocuments/2010/208/934/2010-208934367-07651dff-F.pdf 2010 Form 990], foundation's IRS filing, August 12, 2011.</ref><ref>Lovett and Ruth Peters Foundation, [http://www.guidestar.org/FinDocuments/2011/208/934/2011-208934367-08b3eec6-F.pdf 2011 Form 990], foundation's IRS filing, November 12, 2012.</ref>
*[[Lynde and Harry Bradley Foundation]]: [httphttps://www.sourcewatch.org/index.php/Contributions_of_the_Bradley_Foundation $50,000] (2014) *[[Donors Trust]] and [[Donors Capital Fund]]: [httphttps://www.sourcewatch.org/index.php/DonorsTrust_and_Donors_Capital_Fund_Grant_Recipients $246,400] (2010-2013)
==Core Financials==