Aviva Investors, the £355bn asset management arm of the UK insurance group, has warned companies it will vote against company directors if they fail to bolster ethnic diversity in the boardroom.

Mark Versey, who was announced as Aviva Investors' chief executive on 4 January, has written to company bosses outlining its stewardship priorities for 2021, including how the asset manager wants companies to disclose ethnicity data, including ethnic pay gaps.