The wealth of the 500 richest people in the world grew by an astronomic 25% in 2019. Here are the billionaires who made the most money this year.

Net worth: $59.3 billion

2019 gain: $13.1 billion

Francoise Bettencourt Meyers became the richest woman in the world when she inherited a third of L'Oréal, the world's largest cosmetics company, after her mother died in September 2017, according to the Bloomberg Billionaires Index. Shares of L'Oréal are up 30.8% in 2019 so far, Markets Insider data shows.

Net worth: $63.3 billion

2019 gain: $13.4 billion

Google cofounder Sergey Brin may have stepped down from his role as Alphabet's president, but his net worth still benefitted from the company's rising share price in 2019.

Net worth: $65.2 billion

2019 gain: $14.0 billion

The former CEO of Alphabet and cofounder of Google is the world's 10th richest person with a net worth of $65.2 billion, Bloomberg estimates.

Net worth: $59.5 billion

2019 gain: $15.2 billion

Business tycoon Mukesh Ambani is India's richest man and the patriarch of Asia's richest family, Business Insider's Katie Warren previously reported. Ambani's stake in oil-to-telecom conglomerate Reliance Industries helped him add over $15 billion to his net worth in 2019, while more than half of India's richest people took hits to their net worth during the same time period.

Net worth: $76.6 billion

2019 gain: $17.9 billion

Amancio Ortega built his multibillion-dollar fortune running retail conglomerate Inditex, Zara's parent company, according to the Bloomberg Billionaires Index. Inditex saw record sales in the first half of 2019, up 7% from the same period last year, Markets Insider previously reported.

Net worth: $58.5 billion

2019 gain: $19.9 billion

Former Microsoft CEO and LA Clippers owner Steve Ballmer made nearly $20 billion in 2019, as the software giant increased its dividend, launched a $40 billion share-buyback program, and saw its share price hit record highs as its cloud computing business grows.

Net worth: $113 billion

2019 gain: $23.1 billion

Bill Gates also benefitted from Microsoft's stock surge, the Bloomberg Billionaires Index shows. Gates even briefly dethroned Jeff Bezos as the world's richest man, Business Insider previously reported.

Net worth: $79.4 billion

2019 gain: $27.4 billion

Facebook spent much of 2019 battling negative headlines about its political advertising, poor monitoring of hate speech, and market dominance, but that didn't stop the social network from making money. The value of Facebook shares jumped 45% in 2019 — and as the company's largest shareholder, Mark Zuckerberg was the biggest beneficiary, according to Markets Insider.

Net worth: $37.5 billion

2019 gain: $37.5 billion

MacKenzie Bezos became one of the richest women in the world following her divorce from Amazon founder Jeff Bezos in July. MacKenzie announced in a Twitter statement that she'd retained 25% of the former couple's Amazon shares, while Jeff will keep 75% along with voting control of the shares she now holds.

Net worth: $106 billion

2019 gain: $37.7 billion

In March, the French billionaire overtook Warren Buffett to become the third-richest person in the world, Bloomberg reported. A few months later, he surpassed Bill Gates to become the world's second-richest person for a brief period before dropping back to third. And in October, Arnault made $5.1 billion within 48 hours after a surge in share prices of his luxury conglomerate LVMH. Arnault even spent a few hours as the world's richest person on December 16, Forbes reported.

Arnault now has a net worth of $106 billion, Bloomberg estimates, making the French businessman is the third-richest person in the world and the richest person in the fashion industry.

Net worth: $62.1 billion

2019 gain: $62.1 billion

Julia Flesher Koch took the No. 9 spot on Bloomberg's Billionaire Index that once belonged to her husband, conservative megadonor David Koch, following his death in August. The stake in industrial giant Koch Industries she and her three children inherited from her husband gives her a net worth of $62.1 billion, Bloomberg estimates.