Mostly no, though I am doing some loss-harvesting: selling stocks to take a loss and buying highly-correlated equivalent stocks or ETFs, so that I don't lose out on gains (because timing when to buy back is a bad idea). e.g., selling INTU and buying XLK. Something like http://www.sectorspdr.com/sectorspdr/tools/correlation-track... is useful to find high (0.7 or greater) correlations.