Jonathan Jacob of Forethought Risk, an independent risk advisory firm, sent me his Benefits Canada article, How to deal with excessive risk concentration:In my previous column, Examining portfolio risk, we discussed ex-ante risk, ex-post risk and how both measures can provide greater understanding of portfolio risk. In this column I would like to discuss the options that are available to a pension fund manager that discovers excessive risk concentration in a fund through ex-ante risk reports.When a pension fund utilizes the services of multiple investment managers, there is potential for overlap of risk, causing excessive concentration of risk. Excessive risk concentration can be found in exposure to a single company, a sector of the economy, or a currency among others. If the pension fund manager receives ex-ante reports on risk which aggregate all investment manager portfolios, he or she may recognize an exposure as excessive prior to a potential blow-up.
One potential approach to the excessive risk is to ask one of the investment managers to trim risk to the asset with excess exposure. The investment manager will likely disapprove the request, justifiably claiming that the initial agreement did not include such restrictions and any future measurement of their performance will be tainted by this decision.