Kostas Tsamos, also known as Gus Tsamos, a former stockbroker with Spartan Capital Securities LLC in Garden City, New York, on October 8, 2024, was the subject of a Financial Industry Regulatory Authority (FINRA) imposed 17-month suspension on Tsamos for willfully violating Regulation Best Interest under Rule 15l-1(a)(1) of the Securities Exchange Act of 1934…