On August 22, a recent SEC filing unveiled that DAVID DUVALL, Chief Executive Officer at Core Molding Technologies (AMEX:CMT) made an insider sell. What Happened: DUVALL’s decision to sell 29,150 shares of Core Molding Technologies was revealed in a Form 4 filing with the U.S. Securities and Exchange Commission on Thursday. The total value of the sale is $523,858. Core Molding Technologies’s shares are actively trading at $18.33, experiencing a up of 2.69% during Friday’s morning session. Delving into Core Molding Technologies’s BackgroundCore Molding Technologies Inc operates in the engineere…