Shares of AI lending platform Upstart Holdings (UPST) plunged 5.09% during Wednesday's intraday trading session, underperforming the broader market. The sell-off comes in the wake of the company announcing an expansion of its Board of Directors and the appointment of Peter Bernard, who brings expertise in banking, risk management, and financial markets.

While the addition of Bernard may strengthen Upstart's leadership, there are growing concerns that the company's recent meteoric stock rise of 240% over the past year might be disconnected from its underlying business fundamentals. Some analysts are questioning whether the AI-driven lending platform can sustain such a rapid valuation growth in the long run.

Investors appear to be taking a cautious stance amidst the Board reshuffle and doubts surrounding Upstart's ability to maintain its torrid stock performance. As the company continues to innovate and expand its funding sources, close monitoring of its business execution and financial results will be crucial for market participants to assess the sustainability of its growth trajectory.