They say money can't buy you love, but what about a private island? Yep, the co-founder of Oracle, Larry Ellison, has one of those. He's only fifth on the list of the top wealthiest entrepreneurs. Based on the just-released 35th annual Forbes 400 list, here are the 15 top billionaire entrepreneurs of 2016.

1. Bill Gates

Net Worth: $81.8 billion

Microsoft's 60-year-old founder now spends his time focusing on his philanthropic endeavors together with wife, Melinda. The Bill and Melinda Gates Foundation, which he co-founded, announced it will commit $80 million during a three-year period to a new initiative to bring more women into tech and STEM-related jobs.

2. Jeff Bezos

Net Worth: $72.1 billion

Amazon's founder and CEO, Jeff Bezos, is also a member of the billionaire space club. His aerospace company, Blue Origins, is set on becoming the first business to bring an "astronaut experience" to the mainstream public. So far, Blue Origins has successfully launched and landed four reusable rockets.

3. Warren Buffett

Net Worth: $64.4 billion

This is the first time in 15 years that the 86-year-old lost the second-place spot in the Forbes 400 list. His fortune has reportedly taken a hit after Wells Fargo admitted to fraudulent practices; Buffett's investment fund holds a 10 percent stake in the company.

4. Mark Zuckerberg

Net Worth: $55 billion

Facebook's founder continues to pledge away his wealth. Last month he announced a $3 billion investment over a 10-year period to prevent, cure or manage all diseases in the world. The work will be carried out through the Chan Zuckerberg Initiative, the limited liability company Zuckerberg co-founded with his wife to give away 99 percent of their Facebook shares throughout their lifetimes.

5. Larry Ellison

Net Worth: $49.3 billion

The Oracle co-founder and executive chairman drew media attention a few weeks ago after announcing that "Amazon's lead is over" during his keynote speech at the Oracle OpenWorld conference in San Francisco. Ellison claims Oracle will challenge Amazon's standing in the cloud-computing industry, stating: "We now have a tech advantage over Amazon in infrastructure as a service."

6. Michael Bloomberg

Net Worth: $44.4 billion

The former New York mayor built his fortune in the media industry. He recently donated $300 million to Baltimore's Johns Hopkins Bloomberg School of Public Health. Bloomberg's donation comes after the World Health Organization ranked the U.S. 31st among the world's nations for life expectancy. "My country should be leading in life expectancy, and we're way down in the pack," he said in an interview.

7. Larry Page

Net Worth: $38.7 billion

The 43-year-old co-founder of Google and Alphabet's CEO recently celebrated the search engine's 18th birthday.

8. Sergey Brin

Net Worth: $37.5 billion

Last week, Google's co-founder and Russian-born entrepreneur sold about $26.4 million worth of Alphabet's shares according to a SEC filing. As Alphabet's president, he is required to disclose his trading activities.

9. Phil Knight

Net Worth: $24.6 billion

Knight founded the shoe giant Nike more than 52-years ago in 1964. Last June he retired from his chairman role on Nike's board, where he now serves as Chairman Emeritus.

10. Michael Dell

Net Worth: $20.3 billion

The CEO of his eponymous computer company announced the closing of a $60 billion merger with EMC Corp last month.

11. Paul Allen

Net Worth: $19 billion

Allen is not only Microsoft's co-founder, but also a member of the private space travel elite with his company, Vulcan Aerospace.

12. Donald Bren

Net Worth: $15.2 billion

Bren began building his real estate empire as a 26-year-old in Orange County, California with a $10,000 loan. By 1996, he had become the sole owner of the Irvine Company, a now billion-dollar real estate company.

13. Thomas Peterffy

Net Worth: $12.6 billion

The Hungary-born entrepreneur was a pioneer of digital trading. He invented and introduced trading algorithms in the late 70's and early 80's to Wall Street's trading floors. He is the founder, CEO and chairman of Interactive Brokers Group.

14. Elon Musk

Net Worth: $11.9 billion

The Tesla and Space X founder recently announced his plan to take mankind to Mars within the decade. Of course, many have been quick to point out Musk has a knack for missing his deadlines, including a former NASA astronaut who estimates the technology is more likely 25 years away.

15. Rupert Murdoch

Net Worth: $11.5 billion

The Australian media mogul's empire recently took a blow after sexual harassment allegations surfaced against former Fox News chairman, Roger Ailes.