Upgrades by major financial institutions like JP Morgan typically lead to positive short-term price movements due to increased investor confidence and perceived value. The upgrade from Neutral to Overweight suggests a strong bullish outlook on Affirm Holdings by JP Morgan, likely influencing both retail and institutional investors to adjust their positions favorably towards AFRM. The increase in price target further solidifies this positive outlook, indicating an expectation of upward movement in AFRM's stock price.