Jeff Bezos must have some enemies, real or imagined. Amazon spends more money making sure its CEO is safe than all other Fortune 100 companies, including Disney, Coca Cola, Exxon Mobil, and Goldman Sachs. According to new data released by executive compensation research firm Equilar, Amazon spent $1.6 million on security services and systems for its chief executive in 2013.

The only other organization that comes close to matching Amazon's security spending is Oracle, the second-biggest software company in the world. The rest of the Fortune 100 spent a median $28,618 per CEO in 2013. Amazon shelled out 55 times that figure.

"[Security services] can mean anything from a home security system to security personnel," explains Aaron Boyd, Equilar's director of governance research. "Most companies don't explain exactly what it is, and when they do, they're usually pretty general (e.g., an alarm system for a personal residence)."

Fortune.com tried reaching out to Amazon to see where that money goes, but the company didn't respond. The magazine did, however, dig up the 2014 SEC filing that explains Bezos's $1.6 million like this: "The approximate aggregate incremental cost to Amazon.com of security arrangements for Mr. Bezos in addition to security arrangements provided at business facilities and for business travel."

Fortune.com also interviewed a couple of security experts who explained that inflated security costs can result from active threats (like ISIS or a crazed family member), or simply how much a CEO thinks he or she is disliked. Some people really, really, really do not like that Fire Phone, but $1.6 million still seems like a lot.