We demonstrate that a persistent pattern exists in the evolution of the MTB ratio from 1999 to 2023, wherein firms with high (low) MTB ratios tend to maintain those levels over time. The persistence of the MTB ratio is independent of industry effects and cannot be well explained by accounting performance. Intangible investment plays a crucial role in determining the MTB ratio, and its persistence is primarily maintained through continued internal intangible investment rather than external mergers and acquisitions. Moreover, although U.S. firms have increased their investment in intangible assets over the past 25 years, the gap between high- and low-MTB firms in intangible investment has widened. Our results suggest that the basis of stock value has shifted from tangible to intangible investments over time.

Form 10-K offers a setting for studying how users process complex, multi-layered disclosures: managerial narratives in the main file alongside separate exhibits, such as contracts and certifications, that provide unfiltered detail. Drawing on rational inattention theory, we investigate how users allocate limited attention across these components. Users typically begin with the main file and selectively access exhibits when the main file appears shorter, less readable, or less confident, indicating higher perceived information loss. This pattern strengthens for exhibits that offer more detail on topics discussed in the main file and among institutional investors and time-constrained users. Exhibit access persists beyond the initial filing window and increases around subsequent firm events, especially when external monitoring strengthens and event-related information asymmetry grows. Collectively, our findings underscore the active, discerning nature of user attention in navigating multi-layered disclosures and reveal the often-overlooked informational value of exhibits in Form 10-K.