Risk Parity Concepts

It is December, and this is a period when most investors usually end up overseeing their portfolio allocations to start fresh in the coming year, and preforming periodical rebalancing.

While most just rebalance mechanically back to the original asset weights, we will be looking at whether rebalancing can be carried out in a way that improves returns and minimizes drawdowns when compared to both buy-and-hold strategies, as well as periodical rebalancing.

Many investors – both retail investors investing their personal wealth, and asset managers with millions in AUM – usually employ calendar rebalancing of a portfolio. This could be the quarterly rebalancing of a mutual fund, or that the retail investor sits down annually for a few hours during the Christmas holidays ahead of the new year to rebalance the portfolio.

Such periodical rebalancing is built on the fundament of mean reversion. It essentially sells the winners of the past period, and buys the losers. Over time, this is from where a rebalancing premium is captured when your portfolio consists of several uncorrelated assets. All Seasons Portfolios are a typical such portfolio that benefits from the rebalancing premium.

However, Man Group has researched strategic rebalancing techniques that could mitigate drawdowns through more bespoke methods for rebalancing. Their discussed techniques cover both the periodical rebalancings, as well as mid-period rebalancing when assets’ weights in portfolios deviate by more than a predetermined amount (rebalancing spans).

The retail investor should therefore consider the implications of trend and momentum both for periodical rebalancing and ad hoc rebalancing when using rebalancing spans, and implement a strategic rebalancing approach to further improve risk-adjusted return by minimizing drawdowns and thus the overall portfolio volatility, and potentially capture additional percentage points of return from trend.

In this post, we will be looking at a few ways of how to implement strategic rebalancing for your portfolio. I will also especially highlight the ways I have taken strategic rebalancing to heart in my All Seasons Portfolio.

When it comes to the All Seasons Portfolio strategy, or any other risk parity strategy for that matter, one of the fundamental ingredients is how to allocate the capital between assets in the portfolio based on risk rather than capital.

Why this is important, or even why bother doing it at all, is a question I get quite often. I think therefore it is time to have a closer look at risk parity portfolio allocation principles. Here I mean the reason for why the allocation to the assets is based on their risk (volatility) rather than equal weight based on capital.

In this article, for a comprehensible description, we will be examining a simple two-asset portfolio to illustrate the importance of weighting assets based on risk rather than capital. For this example, I will be using a 60/40 Portfolio consisting of 60% stocks and 40% bonds, as this is popularly (and erroneously) considered as a “balanced portfolio”, and as this is a portfolio allocation strategy among both retail and institutional investors.