Profit is theoretical until you sell a share. So you buy a share for $75 and it's now $100. "I've made $25 profit," you might say. Well yes you've made $25 profit, but only if you sell it now. But if you don't sell it now, it's theoretical and it could be $105 or $65 or whatever the next day. And the day after. And so on. So by "locking in profit" you're essentially getting reward and reducing risk ($25ps in this example). "Lock in profits" on Investorshare probably explains it better.
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