Opendoor stock soared 121% intraday and closed up 42.6% on Monday, fueled by retail investor hype reminiscent of GameStop. With bullish sentiment across Stocktwits and Reddit, OPEN tripled in a week, lifting meme stocks overall. Despite recent gains, the stock is still down 91% from 2021 highs. A viral EMJ Capital forecast of $82 triggered much of the buzz.