Looking at AAPL, how does Yahoo Finance calculate that today's float is 4.59B shares?
I was hoping to find SEC filings from AAPL confirming this, but I can only conclude that the float was 5.20B back on March 31, 2017 (from the latest 10-K): "The aggregate market value of the voting and non-voting stock held by non-affiliates of the Registrant, as of March 31, 2017, the last business day of the Registrant’s most recently completed second fiscal quarter, was approximately $747,509,000,000."
I tried to total up subsequent SEC "changes in beneficial ownership" filings, but they don't add up right.
And, of course, I don't need to match Yahoo. Every website seems to give something different, but Yahoo seemed the most reasonable.