Net worth: $81 billion
Bill Gates started college at Harvard in 1973, but dropped out two years later to found Microsoft. His co-founder, Paul Allen, went to the same high school as Gates.
Gates remained Microsoft’s CEO until 2000, when he stepped down to take on the Chairman role. Now, he serves as a technology advisor to Microsoft CEO Satya Nadella, while focusing on his charity work at the Bill and Melinda Gates Foundation.
In 2007, Gates received an honorary degree from Harvard, when he also delivered the commencement speech.
Company: Dell Computer
School: University of Texas at Austin
Net worth: $18.8 billion
Michael Dell was a freshman at the University of Texas at Austin when he decided drop out. He was a biology major, but computers were what really got him excited at school.
In 1984, Dell founded Dell Computer Corp. and turned it into a multi-billion dollar computer empire over the next 30 years.
Dell became the youngest CEO of a company ever to make the Fortune 500 list in 1992.
He took Dell private in a deal worth $24.9 billion in 2013, and currently serves as the company’s Chairman and CEO.
Net worth: $34 billion
Zuckerberg dropped out of Harvard in his sophomore year to focus on running Facebook. The 30-year old has remained the company’s CEO/Chairman since its founding in 2004.
Facebook went public in 2012 and is now worth over $200 billion.
It had 1.32 billion monthly active users as of June 2014, and had over $7.8 billion in revenue last year.
School: Reed College
Net worth: $6.5 to 7 billion (as of 2011)
Jobs left Reed College to start Apple in his garage back in 1974. With Apple co-founder Steve Wozniak, Jobs revolutionized the computer, music, and mobile industries.
At the time of his death, Jobs estimated net worth was around $7 billion.
But money wasn’t his priority, as he once said, “Being the richest man in the cemetery doesn’t matter to me … Going to bed at night saying we’ve done something wonderful … that’s what matters to me.”
Company: Twitter, Square
Net worth: $2.6 billion
Dorsey is one of the founding members of Twitter, and the founder and CEO of Square.
He went to college at the Missouri University of Science and Technology, before transferring to NYU, where he dropped out to start Twitter.
Dorsey now owns about 5% of Twitter’s outstanding shares and serves as its Chairman. He’s also on the board of Disney.
School: Washington State University
Net worth: $16.3 billion
Allen co-founded Microsoft with Bill Gates in 1975. They went to the same high school at Lakeside School.
He went to college at Washington State University but dropped out after two years to become a programmer for Honeywell.
He’s currently the owner of the NFL’s Seattle Seahawks, NBA’s Portland Trailblazers, and part-owner of the MLS’ Seattle Sounders FC.
School: University of Illinois Urbana-Champaign, University of Chicago
Net worth: $51.1 billion
Ellison is the co-founder and CEO of Oracle, the multi-billion dollar enterprise software company.
He left UIUC in his sophomore year, after his adoptive mother died. The next semester he enrolled in University of Chicago, but dropped out again after just one semester.
In 1977, he co-founded a company called Software Development Labs, which was later renamed Oracle. Ellison is the only person to have ever served as Oracle’s CEO.
Company: Plaxo, Napster, Airtime
School: Chantilly High School
Net worth: $3.2 billion
Parker never even went to college, yet is one of the most successful serial entrepreneurs.
He’s the co-founder of the music sharing service Napster, and later served as Facebook’s first president.
Parker was also involved in the founding of companies like Plaxo and Airtime. Currently, he’s a partner at Peter Thiel’s investment firm, The Founders Fund, and board members of Spotify and Yammer.
School: University of Nebraska-Lincoln
Net worth: $3.1 billion
Williams is one of the co-founders of Twitter. Before that, he co-founded podcasting company Odeo.
Having grown up in Nebraska, Williams went to college at University of Nebraska-Lincoln. But after a year and a half, he decided to drop out to work in a number of different startups.
His first success came at Odeo, but it was Twitter that made him worth billions of dollars. He’s still on the board of Twitter, but is now more focused on the day-to-day operations of Medium, a new blogging platform he created in 2012.
School: San Jose State University
Net worth: $7.6 billion
Jan Koum is the creator of WhatsApp, the mobile messaging startup that was acquired by Facebook in 2014.
Koum was a math and computer science major at San Jose State University, before he dropped out to work at Yahoo. He worked at Yahoo for nine years until 2007.
Koum reportedly made $6.8 billion when Facebook acquired WhatsApp for $19 billion.
Company: Facebook, Asana
Net worth: $8.1 billion
Moskovitz was a sophomore at Harvard, majoring in economics, when he first met Mark Zuckerberg, the founder/CEO of Facebook. They were roommates and quickly became good friends.
He later became the first employee of Facebook and played a major role in turning it into the largest social network in the world.
He left Facebook to launch Asana, an enterprise software company, in 2008. He said being part of the founding of Facebook was the “dumbest luck in the world” in a recent interview.
School: Waseda University
Net worth: $2.1 billion (as of 2013)
Yamauchi was the third president of Nintendo, a position he kept for 55 years before retiring in 2005.
He is largely credited for transforming Nintendo from a small card-making company to a dominant video game powerhouse.
He dropped out of Waseda University to take over Nintendo, a family business his grandfather had found in 1889.
Yamauchi died in 2013 at the age of 85.
Company: Valve Corporation
Net worth: $1.3 billion
Newell is the co-founder of Valve Corporation, a video game company most famous for the sci-fi game, Half Life.
Before Valve, Newell worked at Microsoft for 13 years. He says he was the “producer of the first three releases of Windows.”
Like Microsoft co-founder Bill Gates, Newell is also a Harvard dropout. He once said in an interview that all he learned at Harvard was “how to drink beer while doing a headstand in a snow.”
Net worth: $16.7 billion
Premji dropped out of Stanford at the age of 21, following the sudden death of his father, to run Wipro, the IT outsourcing and services company.
Forbes calls him India's "richest tech tycoon." Wipro had roughly $7.3 billion in revenue last year.
Premji later returned to Stanford at the age of 50 to finish his degree, because he grew tired of being called a ‘college dropout.’
He currently serves as the Chairman of Wipro.