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The Securities and Exchange Commission has sued Institutional Shareholder Services (ISS) to enforce a subpoena, part of a broader push by the Trump administration to increase scrutiny of influential proxy advisory firms. ISS plays an outsized role in shaping shareholder votes at public companies, making it a target of regulatory attention. The lawsuit signals an escalation in regulatory oversight of proxy advisers, which could have implications for corporate governance practices and shareholder voting processes across public companies.