Apple CEO Tim Cook , 57, is at the helm of the only company in the world that's worth $1 trillion.

But he actually is a lot less wealthy than leaders of other, less revenue-generating corporations. He's worth "only" $625 million, while folks like Mark ZuckerbergJeff Bezos, and Larry Page are worth tens of billions.

Cook, who is the son of a shipyard worker and a pharmacy employee, said he's not motivated by money -- and that shows through in what we know about the private CEO's habits.

Here's how Cook made his millions and what he does with them.

Tim Cook is worth at least $625.37 million, according to a 2017 estimate by data company Equilar reported by Time.

Tim Cook is worth at least $625.37 million, according to a 2017 estimate by data company Equilar reported by Time.Marcio Jose Sanchez/AP

Source: TIME

The bulk of that is from his total stock options and shares in Apple, which total nearly $622 million. Cook is also on the Nike board of directors, where he has $3.4 million in stock options.

The bulk of that is from his total stock options and shares in Apple, which total nearly $622 million. Cook is also on the Nike board of directors, where he has $3.4 million in stock options.Scott Olson/Getty Images

Source: TIME

Cook's actual net worth is certainly even higher than that -- but information on his property, investment portfolio, and cash on hand isn't publicly available.

Cook's actual net worth is certainly even higher than that -- but information on his property, investment portfolio, and cash on hand isn't publicly available.Scott Olson/Getty Images

Source: TIME

That's relatively low compared to other tech CEOs. Jeff Bezos, Bill Gates, Mark Zuckerberg, and Larry Page are all worth tens of billions.

That's relatively low compared to other tech CEOs. Jeff Bezos, Bill Gates, Mark Zuckerberg, and Larry Page are all worth tens of billions.Chip Somodevilla/Getty

Source: Forbes

Even though Apple is the highest-value company on the planet, there's only one known Apple-related billionaire: Laurene Powell Jobs, who is Apple cofounder Steve Jobs' widow.

Even though Apple is the highest-value company on the planet, there's only one known Apple-related billionaire: Laurene Powell Jobs, who is Apple cofounder Steve Jobs' widow.Alexandra Wyman/Getty Images

Source: Forbes

In 2017, Cook's salary as CEO was $3 million. That's up from his first year as CEO in 2011, when his salary was $900,000.

In 2017, Cook's salary as CEO was $3 million. That's up from his first year as CEO in 2011, when his salary was $900,000.Justin Sullivan/Getty Images

Sources: Apple regulatory filings from 2018 and 2012

Cook, who came out as gay in 2014, is not married and has no children. He leads a private, solitary life, but here's what we know about how he spends his fortune...

Cook, who came out as gay in 2014, is not married and has no children. He leads a private, solitary life, but here's what we know about how he spends his fortune...Mark Lennihan/AP

Despite being a multi-millionaire, Cook is remarkably frugal. He reportedly buys his underwear at Nordstrom's semi-annual sale.

Despite being a multi-millionaire, Cook is remarkably frugal. He reportedly buys his underwear at Nordstrom's semi-annual sale.Marcio Jose Sanchez/AP

Source: Mashable

"I like to be reminded of where I came from, and putting myself in modest surroundings helps me do that," Cook said. "Money is not a motivator for me."

Justin Sullivan/Getty Images

Source: Inside Apple excerpt by Adam Lashinsky

As of 2012, Cook lives in a $1.9 million Palo Alto home that's 2,400 square feet. That's relatively modest for the ritzy Bay Area city, which now has a median home value of $3.3 million.

As of 2012, Cook lives in a $1.9 million Palo Alto home that's 2,400 square feet. That's relatively modest for the ritzy Bay Area city, which now has a median home value of $3.3 million.Matt Dunham/AP

Cook spends most of his time at the office -- which includes reportedly waking up at 3:45 a.m. to start reading and responding to emails.

Cook spends most of his time at the office -- which includes reportedly waking up at 3:45 a.m. to start reading and responding to emails.Marcio Jose Sanchez/AP

As for travel, Cook has to travel often for work. Apple spent $93,109 last year on Cook's private plane alone.

As for travel, Cook has to travel often for work. Apple spent $93,109 last year on Cook's private plane alone.Emily Wang/AP

Source: Apple regulatory filing from 2018

But he keeps it domestic when it comes to personal travel, visiting spots like Yosemite National Park.

But he keeps it domestic when it comes to personal travel, visiting spots like Yosemite National Park.David Calvert/Getty Images

Source: TIME

One of his known vacations was to New York City with his nephew. He showed the tween boy around the New York Stock Exchange in 2016.

One of his known vacations was to New York City with his nephew. He showed the tween boy around the New York Stock Exchange in 2016.Stephen Lam/Getty Images

Source: CNBC

Indeed, Cook's most-known hobby is his love of fitness, hiking, and cycling.

Indeed, Cook's most-known hobby is his love of fitness, hiking, and cycling.Justin Sullivan/Getty Images

Source: TIME

Cook goes to the gym at 5 a.m. every morning -- but not the Apple company gym, so he can keep a low profile.

Cook goes to the gym at 5 a.m. every morning -- but not the Apple company gym, so he can keep a low profile.Drew Angerer/Getty Images

But we do know that Cook likes to spend money on political causes. He's thrown fundraisers for politicians like Barack Obama and Hillary Clinton.

But we do know that Cook likes to spend money on political causes. He's thrown fundraisers for politicians like Barack Obama and Hillary Clinton.Jacquelyn Martin/AP

Source: Fortune NPR

And, besides paying for his nephew's college education, Cook plans to give away all of his money to charity when he dies. "You want to be the pebble in the pond that creates the ripple for change," he told Fortune in 2015.

And, besides paying for his nephew's college education, Cook plans to give away all of his money to charity when he dies. Scott Olson/Getty Images

Source: Fortune

--This post originally appeared on Business Insider.

Published on: Aug 8, 2018