 CHICAGO--BUSINESS WIRE--R.R. Donnelley Sons Company NYSE: RRD RRD or the Company today announced that the Companys Board of Directors the Board has amended the Companys stockholder rights plan the Rights Plan to extend its final expiration date to August 28, 2022. The Board extended the Rights Plan due to concerns about the potential for one or more persons or groups to gain undue influence over or control of the Company through open market accumulation or other tactic 