Keystone Constructors, Inc. Gaffney, SC Industry: Construction Founded: 2002 Years Honored YearRankGrowth rate 2013 59 45.970% 2007 92 32.080% Aggie Leadership James R. Penn Class of 1977 President, Owner × About About Aggie 100 Application Process Timeline FAQ Honorees 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Summit Award Contact Press