Repligen (RGEN) shares ended the last trading session 4.4% higher at $125.32. The jump came on an impressive volume with a higher-than-average number of shares changing hands in the session. This compares to the stock's 24.4% loss over the past four weeks.Earlier this month, the company announced that it has promoted Olivier Loeillot, its current chief commercial officer (CCO), as its new president and chief executive officer (CEO), effective from Sep 1, 2024. This might have driven the share price rally.Th ...