Hi Toofuzzy
But what happens at lets say the second sell?
Easiest answer is to just measure relative performance by comparing current price to the initial price - not (as I indicated) the current value.
The ones that go up in a straight line without sells will probably not be the largest but logically are the ones most likely to have a large correction EVENTUALLY
Eventually can be a very long time coming! With periodic re-balancing such that you don't concentrate into too few holdings then that splits-down/redistributes the gains.
Starting with perhaps 4 major sectors, say energy/commodities, tech/health, financials, industrial/consumption (4 AIM accounts) with each sector comprised of 4 stocks (16 stocks in total), you have reasonable diversification, practical management (5 AIM accounts including the collective AIM) and reasonable trade size to trade costs ratio.
Once the set declines to perhaps 8 stocks or fewer in total (e.g. generally becoming too concentrated), or two sectors or fewer, then that would be the time to be considering addressing the lack of diversity. In the mean time if energy had risen strongly and been added to at the expense of perhaps tech/health being ejected from the set, and one stock in the energy sector had eaten up the others in that sector, then by the time you come to the re-balance point likely you'll have one stock (or sector) that had performed exceptionally well and that had been added to during its rise. In contrast conventional AIM would likely have reduced holdings in that stock/sector too early.
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