When a share suddenly jumps up the StockRanks, is that the moment to buy - or have you already missed it? It’s one of the questions our members ask most, and until now nobody had answered it properly with data.
This research study measures every one-week StockRank jump on the London market over twelve years - 5,902 events - and tracks what happened next. The result is a simple, tested discipline: the 90/80 Rule, with the evidence on where it works, what it costs, and when to sell.
Every number is measured the honest way: delistings kept in the sample, realistic dealing costs charged, and every result judged against the stocks already ranked at the top.
The finding is among the clearest we’ve published: quality-led jumps into the top decile, held until the rank breaks, compounded at over 16% a year net of costs. Read the study, test the rule, and put the odds in your favour.

