The increase in the price target by a significant margin from $520 to $670 by Seaport Global, along with the maintenance of a Buy rating, is a strong positive signal to the market. This suggests a bullish outlook on the company's future performance and potential for stock price appreciation. Given the analyst's positive stance, investors might view this as a strong endorsement of the company's value and growth prospects, likely leading to increased investor confidence and potential upward movement in the stock price in the short term.