The Institutional Investors Group for Climate Change published a letter signed by 42 institutional investors representing more than EUR 4.5 trillion in assets under management calling on the European Commission, European Parliament and EU Member States to maintain and rapidly implement the EU Methane Emissions Regulation (EU MER) as adopted. The signatories warn that reopening or weakening the framework would undermine regulatory certainty and market stability and slow progress on methane reduction. The letter argues that clear, stable requirements are needed for companies and markets to plan for compliance and manage long-term risks, and points to the EU MER’s monitoring, reporting and verification provisions as central to accountability and to mitigating portfolio risk. It also calls for timely Commission guidance to support compliance planning, consistent implementation across Member States, and rigorous standards for third-country equivalency. Signatories include Nordea Asset Management, Sampension, Miller/Howard Investments and the Church of England Pensions Board.