United Parcel Service Inc (UPS) stock has seen a recent increase, with some outlets reporting a 3.8% gain and others noting a 12% rise over the last 30 days, as well as an 18% jump after a quarterly sales surprise. The company has released its first-quarter 2026 earnings, which included unchanged full-year guidance despite beating targets. The stock's performance and outlook are being discussed by various analysts, with some considering it undervalued and others weighing its potential for further growth.