The latest data point for VST's PEG Ratio in Q4'25 stands at -0.851, indicating a notably undervalued stock relative to its earnings growth, following a pattern of volatility in recent quarters. Over the period from Q1'23 to Q4'25, the PEG Ratio has exhibited high volatility, fluctuating between a low of -0.851 in Q4'25 and a peak of 3.311 in Q1'24, with an overall lack of sustained direction—shifting from negative values in Q1'23 and Q2'23 to positive in Q3'23 and Q4'23, before declining sharply again in Q2'24 and Q4'24. Notable inflection points include the surge to 3.311 in Q1'24, suggesting temporary overvaluation, and the absence of data in Q3'25, which limits insight into mid-year trends. This erratic pattern underscores the need for caution in valuation assessments, as the ratio frequently crosses the 1.0 threshold that separates undervalued from overvalued territory.