Having said that, it's impossible for the CEO to run the company all by himself.
No one needs the most up to date bank balances.
People working in sales have a good idea how many clients they get, and how much they charge.
Same as those who work in account receivables, etc...
It's easy for someone internally to estimate the true revenue of the company.
Hell, even a bank teller can peek at the balance on the computer screen. Info can be leaked easily but I am surprised that the shorts haven't exploited this yet.