Shares of Delek US (DK) are soaring 5.02% in Tuesday's intraday trading session, following a significant upgrade from Mizuho Securities. The surge comes as investors react positively to the improved outlook for the energy company.

Mizuho has raised its rating on Delek US to Outperform from its previous Neutral stance, signaling increased confidence in the company's future performance. Additionally, the financial services firm has bumped up its price target for Delek US to $23 per share from the previous $22, suggesting potential upside from current levels.

The upgrade and increased price target from a respected Wall Street firm appear to be the primary catalysts for today's stock movement. Investors often view such positive changes in analyst ratings as indicators of a company's improving fundamentals or market position, which can lead to increased buying pressure and stock price appreciation.