IMP READ: If you own 4,690,595 or more shares don't forget to file form 13G and protect yourself
I got in trouble once not doing so. Go by the OS listed in the last filing. That is what counts.
For some stupid reason, SEC easily finds that out and goes after poor retail folks.
"Schedule 13G is an alternative SEC filing for the 13D which must be filed by anyone who acquires ownership in a public company of more than 5% of the outstanding stock. The 13G filing is considered a more passive version of the 13D and has fewer reporting requirements than the 13D."