Alphabet Inc. (GOOG) has disclosed a 4% stake in AST SpaceMobile, Inc. (ASTS), confirming a conversion of its previously announced debt investment into 8.9 million shares. This move was detailed in Alphabet's first-quarter 2025 13F filing and relates to an earlier 8-K filing from January 18, 2024. The disclosure has coincided with a notable surge in AST SpaceMobile's stock price, which rose by approximately 19.11% following the announcement. Market observers noted that the stock has been volatile, with daily price swings exceeding 10%, and has gained around 12 times in value over the past year. Technical indicators show ASTS pushing off its weekly 50-day simple moving average (SMA) and closing above its weekly 8-day and 20-day SMAs. Analysts also highlighted the importance of ASTS maintaining a price above $25.20 to potentially reach higher levels near $29. The stock's recent performance is attributed partly to the Alphabet stake disclosure and broader strong demand for high-growth stocks. Additionally, there is mention of investor interest related to Cisneros's involvement and ongoing company progress, though some investors remain cautious due to the stock's volatility.