Upgrades by analysts, especially from Neutral to Buy, typically signal a positive outlook on the stock, suggesting an expectation of outperformance in the near term. The setting of a $15 price target further indicates a specific upside potential that Seaport Global sees in the stock, likely based on their analysis of the company's fundamentals, market position, and growth prospects. This can lead to increased investor interest and potentially drive the stock price up as market participants adjust their positions in response to the new information.