Regulatory scrutiny is increasing across the globe, and has certainly affected both the additive and polyolefin producers. For example, TNPP (Tris(nonylphenol) phosphite) a long-term industry standard antioxidant is facing growing global deselection pressures in the marketplace due to regulatory actions in some jurisdictions. The growing concerns associated with the use of TNPP led to a significant management of change effort for a major PE producer. This paper focuses on project execution excellence (i.e. how to manage a significant and complex additive formulation change that impacted multi-billion pounds of resins). This additive formulation change required extensive planning and flawless implementation involving many different business units and functions (e.g. the Manufacturing, Purchasing, Sales and Marketing, Technical Service, Customer Service, Additives, and Product Safety teams). The paper demonstrates how a project of such large magnitude can be effectively managed and provides key insights and learnings from this significant management of change as it relates to the supply chain.