Sarath Ratanavadi Net Worth

Sarath Ratanavadi has an estimated net worth of $16.7 billion, according to Forbes Real-Time Billionaires, Sarath Ratanavadi profile (figures as of October 20, 2026). That is up from $4.4 billion in 2019.

Sarath Ratanavadi is a Thai engineer and business executive who founded Gulf Development and leads it as chief executive officer. He built his career in power, then expanded into telecommunications and digital infrastructure. He studied engineering in Bangkok and later earned a masters degree in engineering in the U.S. Over time, he turned Gulf into a major name in Thailand through power projects, large corporate deals, and investments tied to fast-growing parts of the economy.

His business started in 1994 with Gulf Electric Company Limited, created as Thailand's power sector was opening up. He added more affiliated power companies in 1996, 1997, and 2004, then brought them together under Gulf Energy Development in 2007. In 2017, Gulf Energy Development went public in Thailand's biggest initial public offering in a decade, raising over 25 billion baht. Later moves into telecom, banking, data centers, and digital assets widened the company far beyond electricity.

How Sarath Ratanavadi makes money

Most of Sarath Ratanavadi's wealth comes from the business he built around energy. Gulf grew from a power company into one of Thailand's largest corporate groups. It operates in power generation and now also has major positions in telecommunications and digital infrastructure. A key part of that shift came in 2025, when Gulf Energy Development merged with InTouch Holdings, the biggest shareholder of Advanced Info Service, to form Gulf Development.

He also pushed Gulf into new areas that could add long-term income. In 2024, Gulf Energy's joint venture with Binance launched a crypto exchange in Thailand. In 2025, a joint venture with Singtel and AIS started operating data centers in Thailand. Gulf also bought a stake in Kasikornbank in May 2025 and kept increasing its holding until it became the second largest shareholder of Thailand's third largest bank by assets.

Forbes net worth and the money picture

Forbes has tracked a sharp rise in his fortune over time. Its World's Billionaires List estimated him at $4.4 billion in 2019, then $11.8 billion in 2022, before reaching $18.1 billion in 2026. Forbes' real-time billionaires tracker put him at $16.7 billion as of October 20, 2026. Those changes came during a period when Gulf moved from being known mainly for power into telecom, digital infrastructure, and finance.

Some of the biggest money moves around Gulf show why investors pay close attention to the company. Gulf Development now sits at the center of several large businesses in Thailand. Its projects include a 70:30 joint venture with PTT to build a $1.3 billion LNG terminal and port on Thailand's east coast. That mix of power, telecom, digital assets, data centers, and banking helps explain why his wealth is tied to more than one industry.