Apple Is the Richest Company, So Where Are All the Billionaires?

• Art Levinson is only insider known to have at least $1 billion • CEO Cook, who took over in 2011, is worth about $600 million

Finding billionaires in Silicon Valley isn’t hard. Dropbox Inc.’s Arash Ferdowsi and Veeva Systems Inc.’s Peter Gassner have both crossed the threshold this year, and tech fortunes make up a fifth -- or about $1 trillion -- of the Bloomberg Billionaires Index.

But tracking down members of the three-comma club at Apple Inc. is a less fruitful endeavor, even though the iPhone-maker is the world’s most valuable company, with a market capitalization of $879 billion.

Chairman Art Levinson is the only ...