Three of the nation’s biggest banks are asking shareholders to reject racial-equity resolutions after they expressed solidarity with the Black Lives Matter movement last year. Citigroup Inc. C, 3.22%, Wells Fargo & Co. WFC, 3.83% and Bank of America Corp. BAC, 4.87% were among the many large U.S. companies to make public statements of support in response to widespread protests last summer after the police killings of George Floyd and Breonna Taylor. In recent days, they have all officially opposed shareholder groups’ calls for them to conduct and publicize racial-equity audits and other changes, saying they are already doing enough...