What would you do with SGD$20,000 unrealized profits earned from stock market in 1 month? Sell or hold?

I think a fair question to ask is, if you take out the profit & capital, where else will the money go that will have more potential that your current stock holdings. Once you have your investment thesis/strategy, the decisions should be clear.

Based on the buy low sell high theory, I would consider to sell 50% of the holding. The realized profit I will put into dividend generating equities, like REITS.​​​