I started investing a couple of years ago as a means of trying to beat the low interest rates available to ISAs and savings accounts and so far it's working out well with the information available via Stockopedia.

I have one active portfolio consisting of ten stocks across diverse markets, and several other portfolios that I simply monitor to see what would have happened, had I invested in those.

What I've noticed is that as the FTSE index rises and falls, generally ALL of my portfolios respond in the same manner. Over the past twelve months, I've seen my active portfolio swing from £700-£1000 in profit, down to a £400 loss, and bounce back again, and this pattern is generally reflected in the other portfolios.

My question is, is there any merit in selling all of my shares when the FTSE is high, and then buying back/rebalancing when the market takes a downward turn? I estimate over the past twelve months, I could have done this four or five times and cashed in £600-£1000 profit which could then be reinvested in full a month later? I realise there are trading costs and potential loss of dividends to consider.

Am I missing something obvious?

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