Buy, Sell, Diversify

Well, I suppose I was extremely lucky to buy two weeks ago before the stock market shot up. Earlier today, I was looking at a $1200, or almost 15%, gain on my previous purchase. I guess it's only about $950 now. However, earlier today, I was wondering if it was a good idea to sell and buy back later, though I still feel that it is probably undervalued. So, do I buy more instead. Then again, it's also about a third of my small investment portfolio so maybe I should buy something else instead.
It's hard to make investment decisions when when you buy has such a large influence over returns. Timing is so much more complicated that deciding which businesses will probably do ok. Earlier, I was wondering if I should put some money into the horizon beta pro for the stock market going down. Notably, if the money was available at the time, and I wasn't so timid, I'd probably still have lost money at this point. Things went higher than expected. I'd probably have posted about that if it weren't for work.
undervalued. It's hard to make investment decisions when when you buy has such a large influence over returns. Timing is so much more complicated that deciding which businesses will probably do ok. Earlier, I was wondering if I should put some money into the horizon beta pro for the stock market going down. Notably, if the money was available at the time, and I wasn't so timid, I'd probably still have lost money at this point. Things went higher than expected. I'd probably have posted about that if it weren't for work.