I do but I don't risk more than 1% of my portfolio. If the stock moves against me, I sell out. If it goes it my favor, I'll move my stop to break even. If it continues to go up, I'll buy more but never risk more than what I've already made in the stock. I'll keep buying as long as I'm making money. When the stock stops moving up, I'll sell out. So I initially risk very little but eventually could own a big chunk if it does well enough.
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