The last report was 775M OS, and at one point there was fair confidence that around 40% of that was float. E-Trade's info says 450M OS and 40M float but that's been like that for a while and I'm sure is inaccurate.
Net Float - which is public float minus control block and shares I know to be in long hands. L2 shows that the price moves up on TINY volume. This wouldn't be possible without a small float. That's just basic econ of supply and demand.