Are billion dollar investments in public companies not public knowledge? (Serious question)
https://www.sec.gov/answers/form13f.htm
For smaller companies it can also come out in a 13D which is faster (within 10 days), but only if the investment is more than 5% of the company. That's why there are a lot of ownership stakes of 4.9%.
Is reporting speed really important enough to change the size of your investment?
Interesting, I think it's the same percentage in Indian stock exchanges.
Corporate insiders (officers, directors, and employees) need to disclose trades involving their own company.
I don't believe an individual trading his or her own money need to disclose anything to the SEC. I could be wrong though.