RMG - AHT ARCT NBRV and RMG among after-hours movers December, 10 2020 05:48 PM RMG Acquisition Corp. Class A Gainers: [[TPGY]] +99%. [[GIK]] +17.4%. [[AHT]] +15.8%. [[FEIM]] +13.9%. [[RMG]] +9.5%.Losers: [[NBRV]] -14.7%. [[OPCH]] -10.1%. [[PHX]] -8.9%. [[CASA]] -6.3%. [[ARCT]] -5.2%. For further details see: AHT, ARCT, NBRV and RMG among after-hours movers