How much do Silicon Valley CEOs spend on security and protection

Silicon Valley is home to a concentration of the world's richest technology billionaires, many of whom spend huge amounts of money on personal security.

Public deposits can give us an idea of ​​how much technology is spent on security, with companies spending millions of dollars to protect their leaders, sometimes buying products like private planes.

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Public archives are only the tip of the iceberg, as the richest in Silicon Valley can supplement their security costs with their own (much deeper) pockets.

Here, in ascending order, how much money do the C Suite stars spend on security.