Repligen Cp (RGEN) gains 4.03% Posted on April 17, 2021 By News Team Repligen Cp (NASDAQ: RGEN) shares gained 4.03% to end trading Thursday at $213.57 per share – a net change of $8.28. Shares traded between $215.00 and $207.73 throughout the day. 209100 shares of Repligen Cp exchanged hands.