In general, I'm trying to find some information that I think might be reported in SEC filings or is otherwise in the public domain, but I do not know where to look. The scenario is best illustrated with the following example.
I noticed an unusually high volume for a particular stock that occurred about a month ago, but for which there was very little fluctuation in the price of the stock. On that particular day, about 16% of the outstanding shares of the company changed hands. The average daily volume for the company, however, is around 1% of the outstanding shares. It seems to me that no stock is so liquid. Therefore, I'm assuming that there must have been a public offering, some dark-pool order was executed, a large number of options were executed, or an insider must have declared a purchase ahead of time. This is because the above possibilities would not come as a surprise to the rest of the market, since knowledge of these activities would either be made public after the fact or beforehand. How can one figure out which of these types of events was responsible for the surge in volume? I was thinking that there might be some sort of SEC filing that could be checked...
What I have discovered so far:
Apparently, S-3 filings with the SEC disclose public offerings of shares by a company. However, I am not sure what would happen if the stock was not part of such an offering.
Edit I've edited the above question to remove references to any specific stocks/symbols.