I'd sell at least half.
A 10x run up in a few months is absolutely, freako-nomically, amazing performance - the heavens are smiling on you. What are you waiting for - absolutely, freako-nomically,
wondermatically, amazing performance, and the heavens of all religions to smile simultaneously??
My SIL had a ten-bagger penny stock. She ended up riding it all the way down to zero. I didn't find out until she called, asking how you go about selling a stock that doesn't seem to be trading anymore...
(yes, I explained how you could claim the loss).
These don't come around often, take a good portion of the gains. Even if you could have done better hanging on, you will still do great.
Guaranteed. It's not often one can say "guaranteed".
I know you said you wouldn't do options, but there is a very simple way to do them in this case. Probably not what you think at all. You buy insurance, right? It is the same concept, w/o all the fine print - really simple. You just buy a 'put'. They are very simple - you pay a fee and you get insurance against the stock dropping below the contracted 'Strike Price' (which you probably pick a little below the current price). If the stock drops, you have the 'option' of selling it at that contract price. An example is easier:
So let's say the stock is trading at $100. You would pay $X for a put at a Strike Price of, say 90. If the stock drops below 90 at any time during your contract, you pull the plug and the option buyer has to pay you $90 for your stock. No ifs/and/buts. But you are out your $X in 'insurance payment.
In some ways, it is better than a stop loss order. If the stock gets hit with bad news over a weekend, and opens at $10, your stop loss will fill at $10, even if you set it at $90. With the put option, you still get your $90 (or whatever you contracted for). I actually had a stock drop in half on after-the-market news. Nothing I could do, nothing a stop-loss order would do other than lock in my loss. And it did come back, eventually (and then some).
If you give us a ticker symbol, we can point out some for you.
Only sell it if IYO it's worth less than what the share price is currently.
Well, the market thinks it is worth its current price. The market really doesn't care what moe thinks, even if she's right.
Up to her of course, but 'guaranteed' is a very nice word, especially when it is a real iron-clad guarantee. I coulda, shoulda, woulda does not sound so nice. BTDT.
-ERD50