[hylaride]

Any stock research platform will tell you shares outstanding ( https://finance.yahoo.com/quote/UBER/key-statistics?p=UBER ), but it’s otherwise as easy as dividing the market cap by the current stock price.

[chinesegoldfarm]

but again, market cap is the full value of public shares available, how can we now that only 10% of uber's shares are public and 90% privately? or how can we know how many public shares does apple offer and how many are private?

[hylaride]

No, market cap is all shares, including ones held privately.