I have watched with interest the impressive progress of Ed's 2015 Stockrank Nap portfolio created in January 2015. So 6 months later I have decided to take a Mid-year Nap plunge so will as cash allows, will put £100K of my portfolio into a purely factor based selection. Instead of pouring over financial ratios, company announcements and brokers forecasts for this part of my portfolio I am letting the screening do the thinking!

Part of my rationale is that the Thompson Reuters financial data (from which Stockranks are derived) is available to most city investment professionals. These city investors have the option of generating multi-configurable factor scores from this data and no doubt a proportion of them (such as Societe Generale) will invest in high factor scoring companies that the computer maths predict are either undervalued and/or have further gain. This is not following the herd because many of the high Stockrank type companies selected will be boring "also ran" stocks that the majority of investors (including me) by-pass. I am banking though that enough money goes into these high multi-factor scoring companies to push up their price over the medium term.

Under this rules based system I am selecting the 2 top Stockrank score companies that pass my screen in each main investment category. So 10 sectors gives me a total of 20 companies, which should be more than enough diversification. Because I am not in a position to put in £100K at once I am choosing one or several sectors from whichever sector(s) are missing from the portfolio and have highest Stockrank at the time. If no company from a particular sector meets the screened criteria then I will remain in cash until one does. This spreads the market entry somewhat and allows for new entries (or Stockrank upgrades) to fill sectors such as Utilities which don't often figure in the screened criteria.

In addition to the Stockrank score I have added an additional criteria because I am at heart I am a quality investor. I do believe that quality companies generally continue to be quality, whilst poor quality companies struggle to turn into quality. So for me an overlay with a Quality score of >80 is required, (thereby selecting companies in the top 20% by Quality). I also like to see positive momentum and value factors which the combined Stockrank…

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