Where to find 13f filings?
Raw unprocessed 13f filings can be found on the SEC website by searching the Edgar database. Simply type the company name in the field and search for it.
Processed 13f filings can be found here by using the search tool or the menu on the top. Processed filings include details like the change from the last quarter, trends, etc.
You can find individual 13f filings on sec.gov.
Websites like Hedge Follow aggregate the data in those filings to show the portfolios of hedge funds and famous investors.