You invested and made a profit - great. It's never wrong to take profits if you are not diversified. You are thinking that there's only one stock in the universe - FNMA. And you think that you will miss out if you don't climb back onto the same bandwagon. There are thousands of stocks in the marketplace - and hundreds of them might be a better investment than FNMA. Who cares if FNMA could go up 20-30% if you find a stock that could go up 200-300%. Do I know which stock? No. However there are smaller companies doing great things that have the potential to grow by 200-300% and still not dominate their market. Look at Tesla (TSLA) not recommending the stock but it produced 50,000 cars are it's stock has has soared faster than Ford or General Motors although they produce millions of cars. Twenty years ago, you'd have brought IBM and not Apple because Apple was a failing home computer business and IBM ruled the computing world. Yahoo, Ebay, Google, Facebook didn't even exist.

Focusing on one stock - a giant too - isn't healthy investing - do research and find the gems of tomorrow.

Here's my story.

I watched FNMA for months, and planned to buy when the stock went over $.40 (forty cents), since it had been bouncing around in the thirty cent range for some time.

I took my attention off it for a few days, and when next I looked, the price was at $.90 (ninety cents). It then proceeded to keep going up until it was over $5.00

You did the right thing to sell.

When you can't figure out what to do, it's time to stay in cash until you have a clear plan. Rushing into things is a mistake.

"Bulls make money, Bears make money, Pigs get slaughtered" - Jim Cramer

Leaving money on the table is not a bad thing. If you buy at a top and things get sour you pay the steepest price and take the largest losses, because there's no buyer to bail you out of your position.

Lack of diversification alone is a reason not to sweat it.

It seems to me you're way to emotionally invested in this trade to think clearly. Take your gain and don't look back.

I'm losing sleep over this one and need some advice from an experienced investor.

Early last year I began acquiring shares of Fannie Mae (FNMA) and slowly built my position to around 4,000 shares at an avg. price of 1.50. I saw some nice gains in this stock over time and rode the ups and downs for about 8 or 9 months. Recently this stock began to jump and I sold for a gain of roughly 134%; Certainly not bad. However my sale was based largely on two things 1.) Highly Concentrated as this accounted for 90% of my account 2.) I was skeptical of the run-up as this stock has spiked then dropped several times.

However, since selling, this stock has received a flurry of news as big name investors are jumping in and sending the stock soaring. Thus far I have probably missed out on an additional 20-30%. It has made me feel sick to my stomach to see the money I left on the table. Quite frankly, I made the decision to sale based purely on emotion.

My question is, Should I buy back in at the now higher price? Should I cool my heels and wait it out? Or should I just be happy with my gain and do nothing. I feel like time is of the essence and I cannot figure out what to do.

Any advice is greatly appreciated.