Ken Griffin, founder and CEO of Citadel, says he is stopping or pausing plans for a New York City expansion following the tax proposal introduced by Mayor Zohran Mamdani. Breitbart reports that Griffin has halted the expansion, linking the decision directly to the mayor’s tax plan. Forbes also describes ongoing consideration of Citadel’s New York footprint amid a dispute between Griffin and Mamdani over taxes, including debates over wealth taxes and their potential effects on jobs and capital investment. According to the coverage, the disagreement centers on whether the proposed tax changes will influence the firm’s willingness to grow locally, and whether such taxes could contribute to “capital flight.” While the outlets differ in their framing—Breitbart states Griffin has halted expansion, while Forbes characterizes the situation as Citadel considering options—both describe the same underlying issue: a tax policy clash with the mayor that is affecting Citadel’s New York strategy. The reports reflect a broader political and economic debate over how tax policy may impact major financial firms’ decisions to expand or relocate.