April 28, 2016 12:01 PM EDT

Facebook certainly takes security seriously — especially when it comes to CEO Mark Zuckerberg.

In a regulatory filing published on April 27, the company revealed how much it has spent on personal security costs for Zuckerberg both at his home and as he travels.

The figures shared in the document indicate that Facebook has spent more than $12 million from 2013 through 2015 as part of Zuckerberg’s security program. Those costs include the procurement, installation, and maintenance of security equipment at Zuckerberg’s home, as well as his security personnel.

These costs are reported in the All Other Compensation column in the 2015 Summary Compensation Table within the filing.

“Because of the high visibility of our company, our compensation & governance committee has authorized an ‘overall security program’ for Mr. Zuckerberg to address safety concerns due to specific threats to his safety arising directly as a result of his position as our founder, Chairman, and CEO,” the filing reads. “We require these security measures for the company’s benefit because of the importance of Mr. Zuckerberg to Facebook, and we believe that the costs of this overall security program are appropriate and necessary.”

This isn’t the first indicator that privacy is a priority for Zuckerberg. In 2013, he purchased four properties surrounding his home in Palo Alto, creating a sort of buffer zone.

Contact us at letters@time.com.

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