After Bitcoin fell roughly 50% from its October 2025 high, BlackRock went back to the core portfolio question instead of treating the drawdown as a verdict on the asset by itself. In its latest research, Re-Underwriting Bitcoin: Still a Portfolio Diversifier, the firm asked what matters most to allocators: how Bitcoin has changed the risk and return profile of a diversified portfolio.
Small allocations still changed the portfolio outcome
In BlackRock’s rolling 10-year analysis through May 29, 2026, a traditional 60/40 equity and fixed-income portfolio produced an annualized return of about 9.9% with annualized standard deviation of roughly 10.1%.
Adding a 1% Bitcoin allocation raised annualized return to about 10.9%, while volatility moved only slightly higher to around 10.3%. At a 2% allocation, annualized return reached about 11.8% and standard deviation rose to roughly 10.6%. Measured against the traditional portfolio, that 2% allocation added about 190 basis points of annualized return and about 50 basis points of annualized volatility.
BlackRock said the portfolio’s Sharpe ratio improved from 0.81 to 0.96, while maximum drawdown shifted from -20.3% to -20.9%. The figures are hypothetical and backward-looking, but the point of the exercise is clear: looking only at Bitcoin’s standalone volatility can miss how the asset behaves inside a broader portfolio. The more relevant issue is how that volatility interacts with what investors already own.
Why the 1% to 2% range keeps coming back
BlackRock continues to describe Bitcoin as an asset with risk and return drivers that differ from traditional assets, tied to its fixed supply, decentralized structure, and independence from any sovereign issuer. That does not stop Bitcoin from trading with other risk assets during deleveraging episodes, but BlackRock’s view is that those correlations have been episodic rather than permanent.
That distinction helps explain the portfolio results. A small Bitcoin position does not transfer the asset’s standalone volatility into a portfolio on a one-for-one basis. What matters is the marginal contribution to total risk relative to the return the allocation has historically delivered. In BlackRock’s work, that trade-off remained favorable at 1% and 2%, even after including one of Bitcoin’s most significant recent drawdowns.
This is not a new range for the firm. In earlier portfolio research, BlackRock approached Bitcoin sizing from the angle of risk contribution and concluded that 1% to 2% could be a reasonable range for investors willing and able to accept Bitcoin risk. At those weights, the firm found that Bitcoin could contribute a share of overall portfolio risk similar to that of an individual mega-cap technology holding in a conventional 60/40 portfolio. Above 2%, Bitcoin’s share of total portfolio risk starts to rise disproportionately.
The new report comes at the same question from the other direction. Instead of asking how much risk Bitcoin adds, it asks what investors historically received for taking that extra risk. BlackRock said the Sharpe ratio moved from 0.81 for the traditional portfolio to 0.90 with a 1% Bitcoin allocation and 0.96 with a 2% allocation. In that historical sample, the extra return more than compensated for the added portfolio-level volatility.
BlackRock does not present 1% or 2% as an optimal allocation. The proper level, it said, depends on liquidity needs, investment horizon, governance constraints, and risk tolerance. What the analysis does offer is a more rigorous way to frame the discussion. The allocation question can be assessed through marginal risk, correlation, drawdown, and portfolio efficiency instead of a binary argument over whether Bitcoin is simply too volatile to own.
IBIT adds a real-world layer to the research
BlackRock’s reassessment is also tied to its own market experience. The firm launched the iShares Bitcoin Trust, or IBIT, in January 2024. In less than a year, the product had gathered more than $50 billion in assets, making it what BlackRock described as the largest exchange-traded product launch in history. It reached that milestone about five times faster than the prior record holder.
BlackRock now describes IBIT as the world’s largest and most traded Bitcoin ETP. In 2025, the fund became BlackRock’s highest-revenue ETF even though the company’s global lineup includes more than 1,000 products.
Concentration in the U.S. spot Bitcoin ETF market is also notable. According to ETF holdings data tracked by Bitcoin For Corporations, U.S. spot Bitcoin ETFs collectively hold about 1.25 million BTC, nearly 6% of Bitcoin’s fixed 21 million supply. IBIT alone accounts for roughly 775,000 BTC, or more than 60% of the Bitcoin held across the U.S. spot ETF complex.
That does not make BlackRock’s research independent of commercial context. IBIT is an important and increasingly valuable product for the firm, and that context matters. At the same time, it means BlackRock’s latest reassessment comes after more than two years of watching how investors actually use Bitcoin exposure at scale.
The theoretical argument for Bitcoin in portfolios is now being accompanied by observable allocation behavior. Investors have had access to Bitcoin through familiar brokerage, advisory, and institutional infrastructure across multiple market environments, including rapid price appreciation and severe drawdowns. IBIT’s growth suggests that demand persisted well beyond the fund’s initial launch window.
Why a drawdown is the right time to test the thesis
The timing of the report may be as revealing as the portfolio simulation. BlackRock did not revisit Bitcoin at an all-time high. It published the analysis after an approximately 50% drawdown from Bitcoin’s October 2025 peak, a period the firm linked to leveraged positions being unwound, slowing ETP flows, and weaker demand from companies accumulating Bitcoin.
Its conclusion is that those forces reflected a positioning correction rather than a fundamental change in Bitcoin’s investment case. That is the point of re-underwriting. An investment thesis should not survive because investors are attached to it. It should survive because the underlying assumptions still hold when conditions shift.
For Bitcoin, those assumptions go beyond historical returns. The asset remains scarce by design, globally liquid, independent of a sovereign issuer, and structurally different from the liabilities that dominate traditional portfolios. BlackRock argues that concerns around fiscal sustainability, monetary stability, and geopolitical risk may become more relevant to Bitcoin’s long-term adoption.
The portfolio evidence does not prove what Bitcoin will return over the next decade, and IBIT’s success does not determine what allocation is appropriate. What the two developments show together is that the institutional discussion has moved forward. Bitcoin is no longer being assessed only as an unconventional asset that institutions may or may not own. It is increasingly being evaluated through the same disciplines used elsewhere in capital allocation: sizing, risk contribution, correlation, liquidity, drawdown, and expected return.
What the article says this means for corporate leaders
The article argues that this shift may be the most important takeaway for CFOs, boards, and corporate operators. The relevant question is not whether Bitcoin is volatile. That is already established. Nor does a corporate allocation need to look like the concentrated Bitcoin strategies used by companies that have built their capital structures around the asset.
Between zero exposure and a Bitcoin-centric balance sheet, there is a much wider range of possible allocations. BlackRock’s research offers a framework for thinking through that spectrum. A relatively small position was enough to materially alter the historical return profile of a conventional portfolio without producing a comparable increase in portfolio-level risk. At 2%, the studied period showed about 190 basis points of additional annualized return for roughly 50 basis points of additional annualized volatility. The allocation was small, but the effect was not.
For corporate decision-makers, the implication is less about adopting BlackRock’s exact allocation range and more about adopting the discipline behind the analysis: define Bitcoin’s purpose in the portfolio, determine an acceptable risk contribution, set liquidity and governance requirements, size the position accordingly, and revisit the assumptions over time.
That is a more mature question than whether a company should simply buy Bitcoin. As Bitcoin becomes more deeply integrated into institutional portfolios and financial infrastructure, the burden of analysis is shifting. The issue facing the C-suite is increasingly not whether Bitcoin belongs in the conversation, but what allocation, if any, can be justified by the company’s objectives, constraints, and cost of capital.
BlackRock has now re-underwritten that question after another full market cycle and a roughly 50% drawdown. Its historical portfolio math still points to the same conclusion: in measured amounts, Bitcoin can improve the equation.
The article includes a disclaimer stating that the content was prepared on behalf of Bitcoin For Corporations for informational purposes only, reflects the author’s own analysis and opinion, and should not be relied upon as investment advice. It says nothing in the article constitutes an offer, invitation, or solicitation to purchase, sell, or subscribe for any security or financial product. The piece first appeared on Bitcoin Magazine and was written by Nick Ward.