You can find out if company employees are buying or selling shares of their companies. That's different from what you probably think of as insider trading, which is using inside information unfairly to profit.
This indicator is used by some people to see if corporations believe in themselves. Those in the know seek to profit in a good business by buying shares or want to escape a sinking ship by selling. Usually. Of course, there's lots of reasons corporate officers might buy or sell shares of their own companies. So take with a grain of salt.
The easiest way to do this is simply through money.msn.com or finance.yahoo.com. Enter your stock ticker or company name and look (in both interfaces) to the left of the screen. Choose Insider Trading/Insider Ownership.
To see the actual documents filed with the SEC, choose our database Morningstar Document Research. Once you're in, simply click on Insider on the left hand side.