Globalstar Inc. (ticker: $GSAT) has experienced significant volatility in its stock price recently. After being alerted at $1.20 by the Head of Research at a financial advisory service, the stock surged over 50% within two trading sessions. However, this upward momentum faced a setback as Globalstar shares fell by 1.10% in premarket trading following news that Apple Inc. (ticker: $AAPL) acquired a 20% stake in the company. The stock's performance has attracted attention, with traders noting a favorable gap in premarket trading earlier in the week.