I am leaning towards compiling a holistic picture of the situation using different pieces of information. So your example of insider selling could be one piece of the puzzle that will influence the subjective probabilities assigned to the outcome.
Quote from oraclewizard77:
To help you out, none of what you mentioned works. A good signal is insider selling. Now some say only insider buying matters. They are wrong, insider selling creates selling pressure and does bring down the stock. Now obviously I am not talking about automated Christmas selling, but out of the blue strong volume selling.
Let's give an example, for when I traded stocks. Out of the blue a biotech stock started to have insider selling, I shorted using put options. Bad news soon followed and the stock fell.
Other signals, you see the LEH CEO come on CNBC saying everything is fine, not to worry about the massive put position in his stock. A small amount of time passes, the company goes out of business. Strong option short positions are done by professionals with insider knowledge.
Here's another good trade that I actually did. A hedge fund that did a strategy where they bought shares in a stock being acquired and shorting the company doing the buying went out of business so there is no one to bring the price of stocks together. A company made an all cash offer and there was still a massive gap between what they were willing to pay and what the stock price was at. I went long, and made good money. If you like you can get my book when I write it on some of these strategies including statistically times during the year when to buy certain stocks and when to then sell them for good profits.