A 1.2% Bitcoin Allocation Can Account for 10% of a Portfolio’s Risk, Charles Schwab Says

A 1.2% allocation to bitcoin can account for 10% of a portfolio’s total risk, Charles Schwab reports. That imbalance reveals how disproportionately crypto influences risk exposure, even at low weights. The finding comes from a risk-budgeting framework the firm analyzed, where small positions in volatile assets can dominate downside potential. A 0.9% stake in ether has the same effect.

This outsized risk contribution contrasts with traditional allocation models, where expected returns drive decisions. Under that approach, bitcoin’s weight swings from zero to 22.4%—depending entirely on the investor’s return assumption. At a 10% expected return, moderate portfolios assign bitcoin just 1.5%. At 25%, that jumps to 16.9%. Aggressive portfolios go from 1.9% to 22.4% over the same range.

Ethereum follows the same sensitivity, though allocations are smaller. At 25% expected returns, it reaches 8.2% in moderate portfolios and 10.7% in aggressive ones. Below 10% expected return, both bitcoin and ether receive zero allocation across all profiles—Schwab’s analysis finds neither offers sufficient risk-adjusted return to justify inclusion at that threshold.

The data covers bitcoin from Jan. 1, 2015, to Oct. 31, 2025, and ether from Feb. 8, 2018, to Oct. 31, 2025, using Schwab Asset Management’s capital market expectations as of that date. Portfolios are defined as conservative (8% equities), moderate (64%), and aggressive (96%), with crypto replacing a portion of equity exposure. Small allocations can drastically alter performance. There is no standard weighting. The decision, Schwab concludes, is personal—one shaped by belief, not formula.