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What's the most correct way to calculate market cap for multi-class companies?
From their 10-K pulled directly from Edgar:  As of October 22, 2015, there were 291,327,781 shares of Alphabet   Inc.’s (the successor issuer pursuant to Rule 12g-3(a) under the   Exchange Act as of October 2, 2015) (Alphabet) Class A common stock   outstanding, 50,893,362 shares of Alphabet's Class B common stock   outstanding, and 345,504,021 Alphabet's Class C capital stock   outstanding. From here just do the math. The shares outstanding are listed on the first page of the 10-Q and 10-K reports. Edit: I believe Class B shares in this instance are not traded on the market and therefore would not be included.