Many fans are curious about Stef Wertheimer's financial success in April 2026. In this article, we dive deep into the assets and career highlights.

What was Stef Wertheimer's net worth?

Founding of Iscar Metalworking

He was expelled from junior high school after punching a teacher who had humiliated students. With limited money and little formal education, his parents sent him to work instead of returning him to school. Wertheimer found jobs in optician shops and optics laboratories, where he learned the mechanical skills that became the bedrock of his career. He later trained as a technician with the British Royal Air Force and completed high-school courses at night.

In 1945, Wertheimer joined the Palmach, the elite strike force of the Haganah. He trained as a pilot, helped manufacture arms, and served as a demolition officer during the final years of the British Mandate. These experiences deepened his appreciation for hands-on production and the importance of technical capability to a nation's survival. After the establishment of the State of Israel, he continued working in mechanical trades, gaining expertise in optics, machining, and repairs. Those skills would lead directly to the project that defined his life.

Stef Wertheimer was an Israeli industrialist, entrepreneur, philanthropist, and nation-building visionary who had a net worth of $10 billion at the time of his death. That made him one of therichest people in Israel.

In 1952, Wertheimer opened a small cutting tool workshop in the Galilee. The business began with minimal equipment and almost no outside capital. He named it Iscar, short for Israel Carbides. At a time when Israel's industrial base was extremely limited, Wertheimer believed that a self-reliant manufacturing sector was essential for both economic strength and national security.

Stef Wertheimer was born on July 16, 1926, in Kippenheim, a town in Germany's Black Forest region. He was the eldest of three children and described himself as a restless and rebellious child. After the passage of the Nuremberg Laws stripped Jews of citizenship, his family fled Germany and immigrated to Palestine in 1937. Wertheimer arrived in Tel Aviv as an 11-year-old who spoke little Hebrew and wore clothing that caused him to be mocked by classmates, an experience that shaped both his toughness and his drive.

A serious car accident in 1983 led Wertheimer to hand day-to-day control of the company to his son, Eitan, though Stef remained chairman for 15 years. In 2006, Warren Buffett's Berkshire Hathaway purchased 80% of Iscar for $4 billion, marking the conglomerate's first major acquisition outside the United States. Buffett later bought the remaining 20% in 2013 for roughly $2 billion, praising both the company and its founder as extraordinary. Iscar became the largest component of the IMC Group, an umbrella of 15 metalworking companies.

Stef Wertheimer's career helped shape the foundation of Israel's manufacturing economy. He founded Iscar Metalworking, a precision cutting tool company that began in a small shack in the Galilee and evolved into one of the most advanced industrial groups in the world.Warren Buffettfamously purchased 80% of Iscar for $4 billion after receiving nothing more than a short letter from Stef's son, later acquiring the remaining 20% in a transaction that valued the company at roughly $6 billion. Wertheimer spent decades promoting the transformative power of industry, believing that manufacturing created shared prosperity, reduced tension, and strengthened society. He used his wealth to build industrial parks across Israel's underdeveloped regions and became one of the country's most influential advocates for coexistence through economic opportunity. Beyond business, he served in the Knesset, received the Israel Prize, and published writings that reflected both a builder's mindset and an immigrant's determination. By the time of his death at 98, Wertheimer had become not only one of Israel's wealthiest individuals, but one of its most consequential architects of socioeconomic development.

Military Service and Early Technical Work

Iscar grew steadily by focusing on precision metalworking tools needed by automakers, aerospace firms, and heavy manufacturers around the world. Wertheimer expanded internationally, purchasing factories in countries such as South Korea and Japan. By the early 1980s, Iscar had become one of the world's leaders in advanced cutting technology.

Ultimately, Stef Wertheimer's financial journey is a testament to their success.

Disclaimer: All net worth figures are estimates based on public data.