We believe that using market cap-weighted indices as the basis for equity portfolio construction raises issues given these benchmarks’ significant bias toward past success, their vulnerability to asset price bubbles, and their concentration risk.

The US Equity market exemplifies this, as it carries heavy (and costly) implicit bets which have been evolving dynamically over time. One of the most striking examples is the technology bubble of the early 2000s. 

At the peak of the bubble, i.e. at the peak of its weight in the index, the technology sector represented almost 34% of the index. By construction, cap-weighted indices will maximise the weight of a stock or sector in the portfolio at the time when that stock or sector is at its highest price.

S&P 500 historical sector weights:

TOBAM offers an innovative quantitative investment approach that aims to maximize diversification and avoid the risk concentrations inherent in market cap-weighted indices.

Our Equity strategies are available in 4 different versions: Anti-Benchmark strategies, MaxDiv indices, Diversified Benchmark indices and Dynamic Beta strategies.