As we approach the end of the calendar year, it is a natural time to take stock; to reflect on things that have gone well and events we wish had turned out differently. For many investors, this introspection will take the form of a portfolio review. When it comes to these, I find myself in a strange conundrum. I enjoy reading other investors' reviews. I often learn a lot from seeing the investment process of others or commentary on individual stocks. However, when it comes to my own portfolio, I always baulk at the idea of writing an annual review.
The problem with portfolio reviews
There are a few reasons why I pull away from doing a full portfolio review. The first is that public disclosure tends to act as a form of commitment bias. If I publicly say these are my best ideas, then it makes it a lot harder to sell them if things go wrong. Of course, Stockopedia writers always disclose when we write about something we hold, but for me, that could vary anywhere between a small short-term special situation and a significant long-term position. The second is that by focusing on short-term results, I may become excessively pessimistic in the bad years and suffer from hubris in the good years. My own performance in 2025 has been nothing to write home about; I’m slightly lagging the FTSE All-Share, which is what I typically benchmark myself against. However, I consider that not too bad a result given my small cap and value focus (see my article earlier this week to learn how UK small caps have fared in 2025). It does feel like I’ve gone 12 punishing rounds with Mr Market in 2025, and come away with a draw at best!
We all tend to “only sing when we are winning”, and annual portfolio reviews can certainly be subject to selection bias, both in the events that investors choose to write about and whether they write one at all. The average portfolio review is certainly not representative of the performance of the average investor in any given period. Investors should keep this in mind when reading reviews during this period.
Hubris is a particularly bad thing for investors; it leads us to take on too much risk after a period of good results, often leading to investors giving back much of their short-term gains. Anyone…