Some coins from ICO are good and some are not. So everytime i receive my coins from ICO i always sell a half of it when the price is good. And i hold some for future purposes. Becaause we don't know if the coin will pump in the future.
We dont know whether the coin will be pumped in the future or dumped too. Because of that reason, sell and hold each half coin or token is good idea so when the price pump we can get more profit and if dump at least we already sell the token in the past.