Michael Bloomberg's biggest fortune began with what looked like a career setback. When Bloomberg was 39, his 15-year career at Wall Street investment bank Salomon Brothers came to an end in 1981. The firm was acquired by Phibro Corporation. A general partner at Salomon, Bloomberg received about $10 million for his stake and walked away from the only full-time job he had known.
Instead of retiring or joining another investment bank, he used the money to pursue an idea born from his years on Wall Street. The thought was financial professionals needed a faster, more efficient way to access market information. That idea eventually became Bloomberg LP, helping turn Bloomberg into one of the world's wealthiest people.
Michael Bloomberg's Wall Street career ended at 39
Bloomberg joined Salomon Brothers in 1966 after graduating from Johns Hopkins University and Harvard Business School. He started in an entry-level position and gradually climbed the ranks, eventually becoming a general partner.
Bloomberg joined Salomon Brothers in 1966 after graduating from Johns Hopkins University and Harvard Business School
His work with the firm's information systems also exposed him to the growing importance of technology in financial markets. Bloomberg saw firsthand how valuable real-time data could be and understood and how difficult it was for professionals to collect and analyse information from different sources.
When Salomon Brothers was acquired in 1981, Bloomberg was among the partners who left the company. He has described the experience as being "fired from the only full-time job he had known."
But the setback gave him something else: capital and the freedom to start over.
He invested his $10 million into a new company
Bloomberg used roughly $10 million from his Salomon payout to launch Innovative Market Systems in 1981 with former Salomon colleagues Thomas Secunda, Duncan MacMillan and Charles Zegar.
The goal was straightforward but ambitious: use technology to put financial data, analytics and information directly in front of professionals. The company's breakthrough came when Merrill Lynch agreed to buy Bloomberg's financial information terminals. The firm eventually ordered 20 terminals and invested $30 million for a 30% stake in the company.
The system evolved into what became known as the Bloomberg Terminal, combining real-time market data, analytics, news and communications on a single platform.
The Bloomberg Terminal became the foundation of his fortune
As financial institutions adopted the terminals, Bloomberg's company expanded rapidly. The business moved beyond terminals and into journalism and media. Bloomberg Business News launched in 1990, later becoming Bloomberg News. The company eventually expanded into television, radio, magazines and digital media.
The combination of financial data, technology and journalism became the defining feature of Bloomberg's business empire. More than four decades after leaving Salomon Brothers, Bloomberg's ownership of the privately held company remains central to his wealth.
Michael Bloomberg donated $1 billion to his alma mater Johns Hopkins (Image Source: Mikebloomberg.com)
Bloomberg's fortune is now estimated at $109.4 billion
Forbes estimates Bloomberg's net worth at approximately $109.4 billion and says he owns about 88% of Bloomberg LP. His wealth reflects the estimated value of his business interests and other assets, rather than money held as cash.
But Bloomberg has also given away an extraordinary portion of his fortune. Forbes estimated his lifetime charitable giving at $25.4 billion through the end of 2025.
His philanthropy has reached billions of dollars
Education has been a major focus of Bloomberg's giving.
In 2018, he announced a $1.8 billion gift to Johns Hopkins University, his alma mater, to support financial aid and need-blind admissions. In 2024, he pledged another $1 billion for financial aid for medical students.
His giving has also supported public health, climate initiatives, cities and government, education, arts and culture, and efforts to reduce tobacco use and address gun violence.
A Wall Street firing became the beginning of a fortune
Bloomberg's story is a striking example of how a career setback can become a turning point.
At 39, he left Wall Street with about $10 million after losing his position at Salomon Brothers. Instead of looking for another banking job, he bet on an idea shaped by his experience with financial data.
That bet became Bloomberg LP, one of the world's leading financial information businesses—and the foundation of a $109.4 billion fortune.
What looked like the end of Bloomberg's Wall Street career in 1981 ultimately became the beginning of his second, and far more lucrative, chapter.