The best part about digging into DD is that you are able to find things that the company tries to keep under wraps. If they are too transparent, then secrets can be stolen, or the PPS can do funny things based on rumor.
Doing DD IS NOT limited to just looking at corporate statements and public filings.
When you learn to connect the dots by every little snippet you come across, a whole different picture gets painted.
Market Data 
Markets 
AI
