The latest infatuation with meme stocks is one of the clearest signs that investor sentiment is now approaching "euphoric levels," Michael brown, a senior research strategist at Pepperstone, told Bus...

Shares of retail favorites Opendoor Technologies (OPEN.O) and Kohl's (KSS.N) resumed their rally on Thursday, fueled by continued meme stock euphoria and broader markets hitting record highs.

So-called meme stocks - stocks that surge in price due to social media hype rather than company fundamentals - are at the forefront of this frothy market behavior.