Thomas Secunda is an American billionaire businessman and co-founder of Bloomberg L.P., where he currently serves as vice chairman and board member, focusing on technology, data, and systems architecture. Born on January 1, 1954, he was one of the four co-founders (along with Michael Bloomberg, Duncan MacMillan, and Matthew Winkler) who started the company in 1981 as Innovative Market Systems while working at Merrill Lynch. Secunda has been instrumental in the company's technological development since its inception, contributing to the evolution of the Bloomberg Terminal into a cornerstone tool for financial professionals worldwide. His career prior to Bloomberg included roles in finance and technology at Salomon Brothers and Merrill Lynch, where his expertise in data processing laid the groundwork for the company's innovations. As of May 2025, his net worth is estimated at US$5.4 billion, primarily derived from his stake in the privately held company. Maintaining a relatively low public profile compared to co-founder Michael Bloomberg, Secunda has been key to Bloomberg L.P.'s operational success, helping it grow into a multi-billion-dollar enterprise. He is recognized for his contributions to financial technology rather than political or philanthropic endeavors, though he has supported some educational initiatives through the company. Throughout his tenure, Secunda has emphasized innovation in data delivery and analytics, solidifying Bloomberg L.P.'s position in the competitive fintech landscape.