Silicon Valley consists of a high concentration of the world’s wealthiest tech billionaires, a lot of whom invest substantial quantities on individual security procedures.

Public filings can offer us some insight into just how much tech magnates invest in security, as their business spend millions to keep their executives safe, in some cases by purchasing them products like personal airplanes.

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Public records are simply the pointer of the iceberg, as Silicon Valley’s wealthiest can supplement their security costs out of their own (substantially deep) pockets.

Here, in rising order, is just how much tech’s C-suite stars invest in security.