Why we cap digital assets at 10%, even for clients who disagree

Every few months, a client asks us to raise their digital asset allocation past our standard ceiling. Usually it's after a strong run in Bitcoin or Ethereum, and the request makes intuitive sense: an asset just proved it could outperform, so why not lean into it further?

Our answer is almost always the same. The allocation cap isn't a judgment about whether digital assets belong in a portfolio — we think they do, for most clients, in a measured way. It's a judgment about what happens to your overall portfolio's volatility and correlation profile once a single asset class grows past a defined share of the total.

The math behind the ceiling

Digital assets have historically shown volatility several multiples higher than a diversified equity index, along with correlation to equities that tends to rise, not fall, during periods of market stress — exactly when diversification matters most. A position that starts at 5% of a portfolio and doubles in value without being trimmed can quietly become 9% or 10% of the total, contributing a disproportionate share of the portfolio's day-to-day swings.

We set the ceiling at the point where, in our modeling, a full drawdown in the digital asset sleeve would still leave the broader portfolio within the risk tolerance stated in a client's Investment Policy Statement. For most clients, that number lands at or below 10% of investable assets. It is not a market call on where crypto prices are headed next.

What the cap actually does in practice

The cap is enforced mechanically, through the same quarterly rebalancing process that governs every other sleeve in the portfolio. If digital assets rally and push the position above its target band, we trim back to target and redeploy the proceeds across the rest of the portfolio. If digital assets fall and the position drops below its band, we can choose to top back up to target, subject to the client's broader plan.

This means clients participate in digital asset rallies up to the point where the position would start to dominate portfolio risk, and are systematically protected from riding a single asset class all the way up and all the way back down.

Why we don't raise it on request

We will discuss raising a client's ceiling as part of a full Investment Policy Statement review, where we can model the effect on the whole portfolio's risk profile. We generally won't raise it on an ad hoc basis in response to a recent rally, because that is precisely the moment when the case for a higher ceiling feels strongest and is statistically weakest.