River makes the case for a 10% bitcoin allocation. The useful part of the report is the portfolio math. Over the past decade, a quarterly rebalanced 10% allocation more than doubled the ending value of a traditional portfolio while increasing the worst peak-to-trough loss by only six percentage points.
The current cycle strengthens that argument. Bitcoin fell roughly 53% from its October 2025 high to the June low. That is brutal in normal markets, but prior full-cycle drawdowns were roughly 85% in 2015, 83% in 2018, and 77% in 2022. If the June low holds, bitcoin’s largest drawdown will have compressed again as the market became larger, deeper, and more institutional. I know those are famous last words, but the direction of travel is hard to ignore.
A 10% position losing 53% costs about 5.3% of the total portfolio before accounting for rebalancing or the performance of other assets. That is real pain, but it is survivable for a properly sized long-term investor. If bitcoin’s downside volatility is structurally declining while its monetary upside remains asymmetric, the responsible allocation should rise with the maturity of the asset. A token 1% position may protect an adviser from looking reckless. It will not materially protect a client from fiat debasement.