Roy Kevin Williams, of Indianapolis, Indiana, a stockbroker registered with Stifel Nicolaus Company Incorporated, has been barred from associating with any Financial Industry Regulatory Authority (FINRA) member in any capacity because Williams refused to provide testimony as requested by FINRA. Letter of Acceptance, Waiver, and Consent No. 2023078783201 (September 5, 2024). FINRA has the authority…