THE ULTIMATE STOP-LOSS order is zero. Stocks can’t go any lower than that. And now and then, much to our dismay, investments get pretty darn close. Refco (RFXCQ) is the latest name to spiral toward worthlessness, joining the disastrous ranks of WorldCom, Enron and, more recently, Northwest Airlines (NWACQ). Since stocks can fall to zero, stop-loss orders must be part of every trader’s investment philosophy.
There are a million different theories on how to employ stop-loss orders. Some recommend a technical indicator, such as placing stops at the 200-day moving average or trendline support. Others use a percentage stop, selling an investment after it falls, say, 20% below the purchase price or a recent high. As with most disciplines, the key isn’t the approach you choose but rather being able to stick with it.
The main complaint I always hear about stops, and why many traders refuse to use them, is that they believe their stops are indiscriminately targeted by specialists. At the New York Stock Exchange, trading is overseen by firms, known as specialists, that make a market in particular stocks. That involves overseeing trading, matching buyers to sellers, and even buying and selling shares themselves when there are order imbalances. Conspiracy theorists — the same people who believe there was a second shooter in the Kennedy assassination or that rapper Tupac Shakur is still alive — suggest that specialists purposely allow markets to drop to levels where stops get hit, only to then allow prices to rally back almost immediately to previous highs. (more…)