Gates' co-founder Paul Allen passed away last year leaving a $26 billion (£19.9bn) estate. Steve Ballmer (pictured), who served as Microsoft CEO from 2000 to 2014, was the company's 30th employee and is now the 19th richest person in the world, with a whopping fortune of $45.7 billion (£34.9bn). The other Microsoft billionaire is Charles Simonyi, the computer whiz behind Word and Excel and the founder of Intentional Software, which Microsoft acquired in 2017. He is currently worth a very respectable $3.2 billion (£2.5bn).
Ruben Rausing founded liquid food packing firm Tetra Laval, the company behind the revolutionary Tetra Pak material, in Lund, Sweden in 1943. He presided over the global expansion of the company, which pulled in revenues of $15.7 billion (£12bn) in 2017/18, until his death in 1983. His descendants are now Sweden's wealthiest family with four members of the clan billionaires. The wealthiest of the lot is Hans Rausing (pictured in 1963), who has a net worth of $12 billion (£9.2bn). He sold his share in the firm to brother Gad in 1995 for an estimated $7 billion (£5.4bn).
The couple's eldest son Leonard is richest with $15.7 billion (£12bn). Their youngest son Ronald chairs subsidiary Clinique and is worth $4 billion (£3.1bn). And the next generation is also getting a slice of the pie. His eldest daughter Aerin (pictured left) serves as Estée Lauder's style and image director and has a fortune of $2.7 billion (£2bn), while Ronald's son William is the company chairman, and is worth $2.1 billion (£1.6bn). Ronald's youngest daughter Jane (pictured right) is Clinique's global brand president and has a $3.5 billion (£2.7bn) fortune.
Once dubbed “the biggest company you've never heard of”, commodities trading giant Glencore was founded in 1974 by the aptly named Marc Rich, who was already a billionaire when he established the British-Swiss firm. Rich, who died in 2013, was indicted in the US in 1983 for tax evasion and illegal dealings with Iran but later pardoned by President Bill Clinton. Current CEO Ivan Glasenberg (pictured) is the wealthiest of the five billionaires created by the company, with a fortune of $5.8 billion ($4.4bn).
Infosys, which has a market cap of more than $44 billion (£33.7bn) at the time of writing, is India's second-biggest IT firm. The company was founded in Pune in 1981 with just $250 (£190) initial capital by seven engineers, five of whom are now dollar billionaires. N R Narayana Murthy (pictured third from the right with five of the co-founders) is the wealthiest of the bunch with a fortune of $2.4 billion (£1.8bn). The “father of the Indian IT industry”, he serves as the company's chairman emeritus.
Former Infosys executive vice chairman Senapathy Gopalakrishnan, who is currently involved with a firm supporting startups, has a net worth of $2.2 billion (£1.7bn). Non-executive chairman Nandan Nilekani (pictured) has a fortune of $2.1 billion (£1.6bn). While K Dinesh stepped down from the board in 2011 and now devotes his time to philanthropy, but is still worth $1.5 billion (£1.1bn). S D Shibulal, who co-founded startup-funding firm Axilor Ventures with Gopalakrishan has a fortune of $1.4 billion (£1.1bn).
Lee Kun-hee's eldest son, Lee Jae-yong aka Jay Y Lee (pictured) is the second-richest family member with a fortune of $6.9 billion (£5.3bn). However, he recently served a jail sentence for bribery. His sister Lee Boo-jin heads the family's Hotel Shilla in Seoul and is worth $1.8 billion (£1.4bn). The other billionaire family members are Lee Kun-hee's sister Lee Myung-hee, his second daughter Lee Seo-hyun and nephew Lee Jay-hyun.
Investing legend Warren Buffett, who is also known as The Oracle of Omaha, has turned Berkshire Hathway into one of the world's most successful enterprises. The company owns a slew of companies including Duracell, Dairy Queen and GEICO, holds significant interests in American Express, Coca-Cola, Apple, and turns over $247.5 billion (£189.8bn) annually. Needless to say, company chair Buffett is a billionaire and then some, with a fortune of $86.3 billion (£66bn).
It doesn't end there for the fortunes of the social network's early backers. Investors Yuri Milner, who later went on to invest in Airbnb and Spotify, and Peter Thiel are worth $3.7 billion (£2.8bn) and $2.5 billion (£1.9bn) respectively. Several employees have also found that working at Facebook has transformed their finances. Former engineering VP Jeff Rothschild amassed a fortune of $2.9 billion (£2.2bn), Facebook's first president Sean Parker, who left the firm in 2005, has $2.7 billion (£2.1bn), and current COO Sheryl Sandberg is presently worth $1.6 billion (£1.2bn).
Jim's sister Alice isn't far behind, with a net worth of $47 billion (£35.9bn), making her the richest woman in the world. And their elder brother Rob has $46.9 billion (£35.9bn). The son of the trio's late sibling John, Lukas Walton is worth $16.4 billion (£12.5bn), while Bud Walton's daughters Ann and Nancy are worth $12.5 billion (£9.6bn). Outside of the Walton family, the other Walmart billionaire is Drayton McLane Jr (pictured), who sold his distribution business to Sam Walton in 1991. He is worth $2.4 billion (£1.8bn).
Executive chairman Thomas Pritzker is the only Pritzker who still works at Hyatt. His fortune stands at $4.2 billion (£3.2bn). Penny, who is worth $2.7 billion (£2.1bn) is a former US Secretary of Commerce, while J B (pictured) is the current governor of Illinois, and has a fortune of $3.2 billion (£2.5bn). The remaining Pritzker billionaires include movie producer Gigi, who is worth $3.2 billion (£2.4bn) and Jennifer, the world's first transgender billionaire.
Chaleo Yoovidhya died in 2012, so Mateschitz shares the company's fortunes with the Thai co-founder's 11 children.Together, they own 51% of Red Bull and have a combined net worth of $21 billion (£16.1bn). Eldest son Chalerm (pictured, with his wife) heads the clan and personally owns 2% of the drink that gives you wings.
The second-richest is Whitney MacMillan (pictured), who has a fortune of $5.9 billion (£4.5bn). The final family member to serve as CEO of Cargill, he stepped down in 1995. Other prominent scions include Gwendolyn Sontheim Meyer who inherited a stake of 7% and net worth of $4.5 billion (£3.5bn), as well as Marianne Liebmann, Austen Cargill II and James Cargill II, who are each worth $4.2 million (£3.2m).
Dhanin Chearavanont is worth some $17.5 billion (£13.4 billlion) and has been the face of the secretive clan for decades. Dhanin passed on his positions as CEO and chairman to his sons Suphachai (pictured) and Soopakij in 2017, and in addition to his wife and children, shares the immense family fortune with three brothers and numerous other relatives.