As of Q4'25, ACHR's latest P/B Ratio stands at 2.13, marking a notable decrease from the previous quarter's 3.50. This most recent data point reflects a continued downward adjustment in valuation relative to the company's book value. From Q1'23 to Q4'25, the P/B Ratio for ACHR has exhibited significant volatility, peaking at 6.40 in Q4'24 before declining sharply over the following quarters. The ratio surged from 1.43 in Q1'23 to above 6.00 by mid-2023, then fluctuated between 3.2 and 6.4 through 2024, and has trended downward throughout 2025. This pattern suggests periods of heightened investor optimism followed by a reversion toward more moderate valuation levels.