Institutional investors have traditionally dominated the ownership structure of large publicly traded companies in the United Kingdom. Attention to the role and participation of institutional investors in the corporate governance of British firms has been growing since the late 2000s following regulatory efforts to empower shareholders, for example, through say-on-pay votes, and to promulgate best practices of shareholder voting and engagement via soft law stewardship codes. This chapter presents the state of the art and recent trends in shareholder engagement and voting by institutional investors in the UK. Asset managers affiliated with large fund groups have been taking a more active approach to stewardship, although their efforts generally focus on identifying and promoting best practice corporate governance standards and dealing with global threats such as climate change and social matters. The chapter also discusses the roles of activist shareholders, proxy advisers and the COVID-19 pandemic in shareholder voting and engagement.