Robinhood stock popped this week on news that European users could trade "tokenized" stock in private companies. OpenAI distanced itself from the plan.

Robinhood’s stock hit record highs with its crypto token launch, but shares slid after OpenAI denied involvement, warning the tokens aren’t legitimate equity.

OpenAI said it was not involved in Robinhood’s launch of tokenized shares in Europe, warning users the assets were issued without its approval.