Back on 3/28/07, Jasper and I each bought 150 shares of MRVL. I bought mine at $17.12 and Jasper bought his slightly cheaper because he is quite sassy with limit orders. You can see our entry day on the Daily - 6 month chart below (click on chart for larger view).

I ended up selling my 150 shares on Friday 3/15/07 at $16.95 for about a 1% loss (-$39.50 after commissions). Jasper still has his - he says he's holding on to his as more of an "investment" and has his sights on a stock price around $21 (that would be a 24% gain).
Why I Sold1) As you can see in the chart, MRVL is trading within a fairly orderly downward channel, and it is currently bumping its head on the "roof" of this channel. This will be its 5th time testing this "roof" line (At the beginning of March it spent a few days above this roof but it quickly fell back into the channel). MRVL may indeed be able to break out of this channel, but I'm gambling that it won't.
2) The 50-day moving average (dotted black line) seems to be weighing the stock down. MRVL has trouble staying on top of its 50-day, and it has now closed above it for the past 4 days. The stock could break free from its 50-day, but again, I'm betting it will continue its behavior and fall back below it.
3) I drew in the vertical blue lines to show peaks. Each peak exhibits similar characteristics: At the peak the Stochastic indicator is above 75, indicating the stock is overbought and ripe for a sell-off. Also at these peaks, the MACD divergence is topping out (green bars at the bottom), which means the stock is losing momentum. The stock currently exhibits the exact same characteristics of previous peaks, so it may see some downside shortly. I bailed out to avoid this possible decline. Who knows, the stock may shoot higher, but I'm out for now.
Lessons LearnedI entered the stock not really knowing what my intentions were, which isn't a good thing. I was leaning more toward a short term trade (I held the stock for about 12 weeks). I violated a key rule to trading: "Plan the trade and trade the plan." I should have set a price target and an exit strategy.
You'll see on the chart that I entered the trade a few days too early. I was "trying to catch a falling knife" and I got cut. I should have let the stock finish its downward drop and then buy when it showed signs of bottoming 3 and 4 days later at about $16.50 (3.6% lower than my purchase price). I pointed out this bullish bottoming pattern, and others, with the green arrows.
I should have been looking for an opportunity to sell, as the stock was peaking. The second red arrow shows where a decision to sell should have been obvious. I also should have been looking out for the last two times that the stock bounced off the "floor" of its trading channel. These would have been excellent opportunities for secondary buying.
What Might Have Been
Here's the money I could have made if I hadn't traded like a total n00b.
1 to 5 : 4/4/07 to 5/7/07 : $16.65 to $17.80 : +7% (+$172 Profit w/150 shares)
2 to 5 : 5/1/07 to 5/7/07 : $16.16 to $17.80 : +10% (+$246 Profit w/150 shares)
3 to Exit Day : 5/31/07 to 6/15/07 : $15.75 to $16.95 : +7.6% (+$180 Profit w/150 shares)
All of these would have been great trades, with relatively obvious buy and sell signals. The lesson here is to monitor a stock's action daily, search for emerging channels and trends, then wait for the stock to tell you it's about to turn around. That's when you take a gamble and buy. Then you have to predict where you think the stock will go, and watch the stock carefully to see when it shows signs of weakness and overextension.
This trade wasn't a total disaster however. I could have sold at the bottom:
Entry Day to 3 : 3/28/07 to 5/31/07 : $17.12 to $15.75 : -8% (-$205 Loss w/150 shares)
Probably an even more profitable way of trading MRVL during this downtrend would be to short it (look at the nasty decline from 5 to 3, a straight 15% drop). This would also require careful monitoring and nerves of steel.