Market Data · StockRETENSION PHARMACEUTICALS INC (RTSN) Stock PriceRTSNOctober 13, 2026Close · October 13, 2026USD 11.63+USD 0.31 (+2.74%)Day rangeUSD 11.41–USD 12.50Opened at USD 11.83Low Open CloseHighVolume138.0K