Fidelity Says the Burden of Proof Has Flipped on Bitcoin

In a study published this week titled Getting Off Zero: Evaluating Bitcoin in 2026, Fidelity Digital Assets argues that the burden of proof now sits with those who hold no Bitcoin — not with those who do. The central question, writes research director Chris Kuiper, is no longer whether Bitcoin deserves consideration in a portfolio but rather: what is your current allocation, and why? That means it is time to buy Bitcoin if you’re sitting on zero, folks.

The shift in framing is significant. Fidelity manages roughly $5 trillion in assets, and its digital assets division has been among the more forward-leaning institutional voices on crypto since launching custody services in 2018. But this report goes further than previous publications, presenting a data-driven case that a zero-weight Bitcoin position now requires active justification rather than being the default.

The Numbers Behind the Argument

The headline statistics are difficult to dismiss. Bitcoin has been the top-performing asset class in 11 of the past 15 years, according to the report. More importantly for institutional allocators, its risk-adjusted returns — measured by both Sharpe and Sortino ratios — are also the highest across all major asset classes over both five- and ten-year windows.

10-Year Asset Class Comparison, Source: Fidelity

That distinction matters because it neutralises the most common institutional objection: that Bitcoin’s returns simply reflect uncompensated risk. Fidelity’s data suggests the opposite — that the volatility has been more than paid for, and that Bitcoin has historically delivered more “good volatility” (sharp upside moves) than “bad volatility” (sharp drawdowns). The monthly return distribution chart in the report shows a pronounced rightward skew, with positive months both more frequent and more extreme than negative ones.

This characteristic, Kuiper notes, challenges traditional finance frameworks where volatility is treated as uniformly negative. If an asset consistently delivers more upside surprise than downside, the standard deviation ceases to function as a reliable proxy for risk.

The M2 Correlation

Perhaps the most striking single data point in the report is the correlation between global M2 money supply growth and Bitcoin’s price. Fidelity calculates an r-squared of 0.87, meaning 87 per cent of the variation in Bitcoin’s price over the past 15 years can be explained by changes in broad money supply. The research team is careful to note this is correlation rather than proven causation, but adds that it believes a causal relationship exists from an economic theory perspective.

Global M2 and Bitcoin, Source: Fidelity

The implication is that Bitcoin has functioned as a monetary inflation hedge — not necessarily tracking consumer price indices in real time, but responding to the upstream expansion of money supply that ultimately drives both asset and consumer price inflation. For investors concerned about currency debasement in an era of persistent fiscal deficits, this framing positions Bitcoin alongside gold as a store-of-value instrument — though the two remain distinct enough in their market dynamics to warrant holding both.

Fidelity’s data shows that Bitcoin and gold exhibit low long-term correlation and tend to take turns outperforming each other over rolling 90-day periods, suggesting they serve complementary rather than substitutable roles in a portfolio.

A Little Goes a Long Way

The report’s portfolio construction section is where the practical implications become clearest. Using a standard 60/40 stock-bond portfolio as the starting point, Fidelity models the historical impact of adding Bitcoin at various weightings. Even a one per cent allocation improved risk-adjusted returns, but the most significant jump in Sharpe and Sortino ratios occurred when moving from one to three per cent.

Under a mean-variance optimisation using what Fidelity describes as conservative forward-looking assumptions — a 25 per cent expected annual return for Bitcoin with 50 per cent volatility, against 14.5 per cent for equities — the maximum Sharpe ratio portfolio contained 9.4 per cent Bitcoin and, notably, zero per cent bonds.

10-Year Asset Class Comparison, Source: Fidelity

Crucially, the report finds that the funding source for a Bitcoin allocation matters far less than the decision to allocate at all. Whether the position is carved from stocks, bonds, or both produces nearly identical outcomes. Similarly, rebalancing frequency has marginal impact, though longer intervals allow Bitcoin’s asymmetric upside to compound more effectively.

The 60/40 Under Pressure

Fidelity does not limit its argument to Bitcoin’s merits in isolation. A substantial portion of the report examines structural headwinds facing the traditional 60/40 portfolio — the backbone of institutional asset management for decades.

On the bond side, the report cites U.S. public debt-to-GDP near 120 per cent and references a 2011 IMF paper on “financial repression” — the deliberate suppression of real interest rates to erode sovereign debt burdens over time. If that framework plays out, bondholders face a prolonged period of negative real returns, effectively functioning as a tax on fixed-income investors.

On the equity side, cyclically adjusted price-to-earnings ratios sit at historically elevated levels. While Fidelity acknowledges that structural shifts such as capital-light business models and AI-driven productivity gains could justify higher multiples, it notes that markets priced for perfection leave little margin for disappointment.

The combined effect is an environment where both legs of the 60/40 may deliver below-average returns relative to recent history — precisely the scenario in which uncorrelated, asymmetric alternatives like Bitcoin become most relevant.

From Theory to Practice

The timing of Fidelity’s report is worth noting. This week alone, MARA Holdings sold $1.1 billion in Bitcoin to repurchase convertible debt at a discount, demonstrating active corporate treasury management of BTC holdings, while Coinbase and Better launched the first Fannie Mae-eligible crypto-backed mortgage — embedding Bitcoin into the plumbing of the American housing finance system.

Each development reinforces the report’s central argument from a different direction. Miners are managing Bitcoin as a balance-sheet instrument. Consumer lenders are accepting it as collateral. And now, one of the world’s largest asset managers is telling institutions that ignoring it entirely is no longer a defensible position.

Whether allocators act on that message will depend on their individual mandates, governance structures, and risk tolerance. But Fidelity’s contribution to the conversation is clear: the era of dismissing Bitcoin by default is over. The era of justifying its absence has begun.