Shares of Sunrun (RUN) are surging 7.76% in pre-market trading on Monday, following a significant analyst upgrade. The solar energy company's stock is attracting investor attention as it begins the week on a strong note.

The catalyst for this pre-market rally appears to be Guggenheim analyst Joseph Osha's decision to upgrade Sunrun from Neutral to Buy. Osha also set a price target of $27 for the stock, signaling confidence in the company's potential for growth. This upgrade comes at a time when renewable energy stocks are gaining increased focus from investors and analysts alike.

Sunrun, a leading provider of residential solar, battery storage, and energy services, has been navigating a complex market environment. While the upgrade suggests positive sentiment towards the company's prospects, it's worth noting that another firm, Barclays, maintained a Hold rating on Sunrun with a price target of $23. As the market opens, investors will be watching closely to see if the pre-market gains hold and whether Sunrun can maintain this upward momentum throughout the trading session.