Which type of investment is NOT subject to fair value reporting other than for external investment pools?

Real estate investments fall under a category in accounting practices that often do not require fair value reporting, particularly when considering their treatment outside of external investment pools. Fair value reporting is typically utilized for investments like equity and debt securities, which can fluctuate significantly in market value. In contrast, real estate is often reported based on historical cost or depreciated cost in financial statements.

When it comes to investments in external investment pools, fair value reporting applies specifically to the individual investments held by these pools, but not to the pool itself as a distinct entity. This distinction is significant in accounting because it emphasizes that while many financial assets are subject to fair value reporting due to their nature, real estate is more commonly evaluated based on its long-term value and not often marked to market as frequently as other types of investments that are more liquid in nature. Thus, real estate is the correct answer, as it is generally not subject to fair value reporting compared to other investments listed.