Meme stock fever is back, and JPMorgan has highlighted four new names drawing heavy retail buying and hedge fund shorting. Hims & Hers (+110% YTD, 31% short interest), Rocket (+97%, 5.3%), SoundHound (-29%, 28.7%) and ImmunityBio (+0.4%, 8%) are all trending on Stocktwits with bullish sentiment, making them prime candidates for sudden spikes.