The addition of well-respected biotech expert strengthens one of Oppenheimer's longest-standing franchise areas NEW YORK, Dec. 8, 2025 /PRNewswire/ -- Oppenheimer & Co. Inc., a leading investment bank, wealth manager and subsidiary of Oppenheimer Holdings (NYSE: OPY), today announced that Kostas Biliouris has joined the firm as Managing Director on its Biotech Research Team. He will report to William (Bill) Bird, Director of Research, and be based in New York City. Biliouris comes to Oppenheimer from BMO C ...