In October 2011 the Roundtable awarded [[Charles G. Koch]] the William E. Simon Prize for Philanthropic Leadership. The award gives $250,000 to a charity of the prize recipient's choice, and is intended to "honor living philanthropists who have shown exemplary leadership through their own charitable giving, either directly or through foundations they have created." In its explanation for why Koch was the recipient, the Roundtable claimed that "For more than 40 years, he has been at the forefront of strategic investment in ideas, think tanks, and academic research." <ref> [http://www.philanthropyroundtable.org/topic/excellence_in_philanthropy/2011_william_e_simon_prize_for_philanthropic_leadership The Philanthropy Roundtable announces Charles G. Koch as the 2011 recipient of the William E. Simon Prize.], accessed 10/20/2011 </ref> Not surprisingly, Koch has maintained a longstanding financial relationship with the foundation.
Between 1993 and 2005, the Philanthropy Roundtable received $94,500 in donations from Koch's own philanthropic organization, the [[Charles G. Koch Charitable Foundation]].<ref>[http://old.mediatransparency.org/recipientfundergrants.php?funderID=9&recipientID=280 Media Transparency: Grants to Philanthropy Roundtable from Charles G. Koch Charitable Foundation], accessed 10/20/2011 </ref> Koch contributed $125,000 more to the Roundtable between 2006-2009, bringing [[Charles Koch]]'s total contributions to the [[Philanthropy Roundtable]] between 1993 and 2009 to $219,500.<ref> [http://mediamattersaction.org/transparency/organization/Philanthropy_Roundtable/funders?year=- Media Matters Action Network: Conservative Transparency], accessed 10/20/2011 </ref>
Koch has a long history of involvement at the Roundtable's annual meetings. A 1997 report by the National Committee on Response Philanthropy documented the participation of the Koch Brothers in the 1995 conference: