As of Q1'26 (2025-11-23), Costco's latest P/B Ratio stands at 12.636, reflecting a notable decrease from its recent peak values earlier in the period. This latest data point suggests a moderation in the company's price-to-book valuation after a period of elevated ratios. Over the period from Q3'23 to Q1'26, the P/B Ratio for Costco exhibited significant volatility, rising sharply from 9.638 in Q3'23 to a high of 17.334 in Q1'25. After reaching this peak, the ratio began to decline, dropping to 12.636 by Q1'26. This trend indicates a period of strong valuation expansion followed by a correction, suggesting changing investor sentiment or adjustments in the company's book value relative to its market price.