BlackRock Re-Underwrites Bitcoin, And The Portfolio Math Still Holds

Bitcoin’s roughly 50% decline from its October 2025 high has created a useful test for the institutional investment thesis. It is relatively easy to make the case for a new asset while prices are rising, correlations are favorable and capital is flowing into the market. The more revealing exercise comes after a major drawdown, when investors can revisit the original assumptions and determine which were structural and which were simply products of the preceding cycle.

That is effectively what BlackRock has done in its latest research, Re-Underwriting Bitcoin: Still a Portfolio Diversifier. Rather than treating the recent drawdown as evidence for or against Bitcoin in isolation, the firm returns to the question most relevant to an allocator: how has Bitcoin actually affected the risk and return characteristics of a diversified portfolio?

The results are more consequential than the headline return figures suggest. In BlackRock’s rolling 10-year analysis through May 29, 2026, a traditional 60/40 equity and fixed-income portfolio generated an annualized return of approximately 9.9% with annualized standard deviation of roughly 10.1%. Introducing a 1% Bitcoin allocation increased annualized return to approximately 10.9%, while volatility moved only modestly higher to roughly 10.3%. At a 2% allocation, annualized return reached approximately 11.8%, with standard deviation of about 10.6%.