The BlockBridge 500^™ Index

Traditional benchmark indices were designed around a worldview in which asset classes were administratively distinct. Broad large-capitalization U.S. equity indices measure large-cap U.S. equities. Aggregate bond indices measure investment-grade U.S. fixed income. Cryptocurrency indices, where they exist, measure digital assets in isolation. Each benchmark assumes that its asset class is a self-contained universe with its own pricing, liquidity, and investment characteristics.

This framing reflects the institutional structure of capital markets through the late 20th and early 21st centuries, when public equities, debt instruments, and alternative assets were traded on separate venues, custodied by separate intermediaries, and analyzed by separate research disciplines. The framing made sense as a description of how capital was actually allocated.

That structure has changed. Spot Bitcoin exchange-traded products, listed on the same exchanges as equity ETFs and accessible through the same brokerage accounts, accumulated tens of billions of dollars in assets under management within roughly a year of their January 2024 launch. Publicly traded companies have begun adopting Bitcoin as a primary corporate treasury asset, blurring the boundary between equity ownership and direct cryptocurrency exposure. Institutional research desks and family offices have moved from treating digital assets as unclassifiable to treating them as a recognized portfolio component, typically at allocations of one to fifteen percent.

The BlockBridge 500™ is constructed on the premise that the administrative boundary between equities and cryptocurrencies has outlived its analytical usefulness for U.S. large-capitalization portfolio construction, and that a unified, market-capitalization-weighted view of the largest investable assets across these categories is now both possible and informative.

Capitalization-weighted indices represent capital allocation as it exists, rather than as a methodologist prescribes it should exist. Their primary intellectual appeal is that they require no view on which constituents “belong” beyond the market’s own pricing decisions. An equity that grows in market value becomes a larger weight; an equity that shrinks becomes a smaller weight; and an equity that fails to qualify becomes a zero. This passive-by-design property is what made modern index construction foundational to modern indexing.

Extending this logic to cryptocurrencies is mechanically straightforward when calculated on a fully diluted or effective-circulating-supply basis: cryptocurrency market capitalization is observable, comparable to equity market capitalization, and updated continuously. The decision to include cryptocurrencies in a primarily equity-focused index then reduces to a single question: do their market capitalizations clear the same threshold required of any other constituent? In the BlockBridge 500™ framework, that question is answered by the market itself — a cryptocurrency is included when its market capitalization exceeds that of the smallest equity that would otherwise occupy a slot in 500 of the largest equities trading on domestic American exchanges.

This construction produces an index whose cryptocurrency weight is not assigned by methodology but emerges from the relative pricing of the underlying assets. When cryptocurrency market capitalizations grow relative to equities, their representation in the index grows; when they shrink, it shrinks. The framework is, in other words, a description of market-cap reality rather than a tactical allocation decision.

Note on market-capitalization measurement. Equity market capitalization is measured as free-float-adjusted shares outstanding multiplied by price. Cryptocurrency market capitalization is measured as effective circulating supply multiplied by reference price — a distinct calculation that excludes supply not available for trading. The two measures are intended to be comparable for ranking purposes but are not computed identically; the precise definition of effective circulating supply will follow the published methodology of the appointed calculation agent.

A small but growing population of publicly traded companies has adopted Bitcoin — and, increasingly, Ethereum and other digital assets — as a primary corporate treasury asset, holding the asset on their balance sheet not for operational reasons but as a long-term store of value. These companies offer a hybrid exposure profile: they are equity instruments subject to ordinary corporate-governance and operational risks, but their equity value is materially driven by their digital-asset holdings.

The BlockBridge 500™ treats these companies as a distinct, separately screened classification rather than as a passive tag. A company is not included merely because it holds a digital asset; it must satisfy additional, auditable eligibility criteria beyond market capitalization (described at a high level in Section 2.2 and to be finalized prior to launch). This is a deliberate point of differentiation: no established index provider has systematically defined, screened, and tracked digital-asset treasury companies as a separate constituent category. Because the criteria apply on top of the index’s market-capitalization standard, some companies that hold digital assets will not qualify — which is the intended, differentiating behavior.

For illustration, under a May 2026 reference snapshot, five companies would meet the index’s developing definition of a digital-asset treasury company, collectively representing approximately 0.25% of illustrative index weight.

The index is designed to serve three primary use cases:

1. A benchmark for hybrid equity-and-digital-asset investment strategies and for investment products that may seek to track an index of this type.
2. Reference benchmark for asset allocation analysis comparing traditional large-capitalization equity exposure against a market-capitalization-honest view that incorporates digital assets.
3. Foundation for future BlockBridge index family extensions (BB10, BB20, BB50, BB100), which apply the same construction principles at narrower constituent counts and may serve as sub-benchmarks for thematic or concentrated investment products.