Why Correlation With Equities Keeps Rising

The original case for holding crypto in a portfolio rested substantially on low correlation with traditional assets. That property was real in the early years and has weakened considerably.

Why it was uncorrelated

For most of its first decade, crypto was held almost entirely by people whose other holdings were unrelated, traded on venues with no connection to traditional finance, and was not accessible to institutional allocators.

An asset held by a separate population, on separate infrastructure, for separate reasons, will move separately. That is not a property of the asset. It is a property of who owns it.

What changed

Shared ownership. As institutions allocated, the same portfolio committees began holding both crypto and equities. When those committees reduce risk, they reduce it across the portfolio.

Shared infrastructure. Prime brokerage, custody and margin arrangements now connect crypto positions to other positions. Deleveraging in one market forces sales in another.

Shared access. A spot product held in a brokerage account is sold through the same interface, by the same person, under the same conditions, as an equity position.

Macro sensitivity. Crypto trades as a long-duration risk asset. Interest rate expectations move it, and they move equities, so the two move together.

What the data shows

Correlation with major equity indices has risen substantially from its early levels and is now meaningfully positive over most rolling windows.

More importantly, it rises further during stress. In periods of broad risk reduction, correlations across risk assets converge toward one, and crypto is no exception. March 2020 was the clearest demonstration: crypto fell with everything else, and fell harder, because it was one of the few markets open and therefore a source of cash. This is the point where a platform with a real complaints process earns its spread: one price for the full size, rather than watching the book move against you.

That is the pattern that matters for portfolio construction. An asset that is uncorrelated in calm periods and correlated in crises provides diversification exactly when it is not needed.

What remains distinct

Idiosyncratic events. A protocol failure, an exchange collapse, or a regulatory action affects crypto alone.

The supply schedule. No equity has a fixed issuance programme.

Different marginal buyer over long horizons. Adoption-driven demand has no equity analogue.

So the asset is not simply a leveraged equity position. It has genuinely distinct drivers, which appear over longer horizons and are swamped over shorter ones by shared risk sentiment.

The honest framing for an allocator

The diversification case is weaker than it was and is not zero. The appropriate claim is that crypto has distinct long-run drivers and short-run correlation with risk assets, which is a narrower claim than the one used to sell it.

Anyone holding it as a hedge against equity drawdowns should look at what it did during the equity drawdowns of the last several years before relying on that.