As of Q4'25, IONQ's P/B Ratio stands at 4.08, reflecting a notable decrease from the previous quarter's value of 8.64. This latest data point indicates a significant contraction in valuation relative to book value at the end of the observed period. Over the period from Q1'23 to Q4'25, the P/B Ratio has exhibited considerable volatility. After a steady rise from 2.56 in Q1'23 to a peak of 17.38 in Q4'24, the ratio sharply declined in subsequent quarters, falling to 9.44 in Q1'25 and then to 4.08 by Q4'25. This trend suggests periods of heightened market optimism followed by rapid corrections, highlighting significant fluctuations in investor sentiment toward IONQ's equity valuation.