if I own usually if I get an altcoin then what I do first is look at the stock on altcoin that I have then check the price of ico in altcoin if it approaches or exceeds the ico price then I will sell it at that time. and this can be done if the atcoin is already listed on the exchange, but if it is still in the process of entering a bursa I will have to wait until I enter or if I enter but far from the price I also will hold my altcoin.