Analyst upgrades, especially from reputable financial institutions like Jefferies, can significantly influence investor sentiment and stock prices. The upgrade from Hold to Buy suggests a strong bullish outlook on Frontline by Jefferies, likely based on fundamental or market conditions favoring the company. The increase in price target from $22 to $30 represents a substantial upward revision, indicating an expectation of strong performance or value appreciation. This news is likely to attract investor attention and buying activity, driving up the stock price in the short term.