A well kept stocks secret is that anyone could follow insiders from big companies to see what they are trading and this way you can anticipate as well in what direction the market moves. Just think of tracking CEOs and see when they are launching orders to buy or sell stock in their own companies which usually translates in share prices moving higher or dropping suddenly. You can do different analysis, but that cannot be in any way one action perform by an insider as it holds information which might not be on the market.
The insider information is publicly available through the U.S. Securities and Exchange Commission website and is updated in real time with this information. You have an advance search mechanism that will allow you to pinpoint also the person involved in a company (like CEO, CFO or others) or companies themselves, dates of orders or other options. Imagine just to follow up Elon Musk and see his moves and replicate them on the market, you would earn big by taking the right actions on trusted figures.
And now to reveal the most kept secret on stocks here it is the link with the Database search for Insider order at SEC website - Insider Trading and a picture on it.
From there we can open the documents detailing the actions performed like buying or selling, number of shares or other information on that like "The Elon Musk Revocable Trust dated July 22, 2003, for which the reporting person is trustee, purchased 13,037 shares of the issuer's common stock at the public offering price in a registered common stock offering by the issuer that settled on February 19, 2020.".
Hopefully this information is helpful in case you are involved in stocks trading and you can leverage this against your intended actions. Knowledge is power and this little secret for sure is something that will provide an edge on the market!