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7-Main
7-Main operates as the single-family office for Ruthi Wertheimer, a Harvard Business School alumna who studied industrial design at Bezalel Academy before...
7-Main
7-Main operates as the single-family office for Ruthi Wertheimer, a Harvard Business School alumna who studied industrial design at Bezalel Academy before moving into principal investing. The firm's wealth origin is anchored in the Wertheimer family's liquidation of IMC Metalworking Companies: Berkshire Hathaway acquired an 80% stake in 2006 for $4 billion and the remaining 20% in 2013 for $2.05 billion (per Reuters, 2013). An additional industrial asset, Blade Technologies International Group, was sold to Pratt & Whitney, cementing the liquidity that underpins the office today. The firm's investment posture is rooted in tangible assets, with a portfolio centered on commercial real estate and industrial infrastructure. The headquarters property stands at Shanker Arieh 16 in Herzliya, Israel; the office also stewards a residential holding on Ahavat Zion Street in Tel Aviv. The family's interest in industrial parks extends to the Tefen Industrial Park in the Galilee and the Nazareth Industrial Park, both conceived by patriarch Stef Wertheimer to spur regional economic development. A broader network of industrial parks spans Israel and Turkey, reflecting a cross-border asset base that links real estate to operating-company ecosystems. The office is led by Ruthi Wertheimer, who carries forward the family's industrial legacy alongside the philanthropic initiatives founded by her father Stef. The family's wealth events have been studied as a case in long-term industrial development, from the founding of Iscar in a shed to its ultimate valuation by Berkshire Hathaway. Ruthi's late brother Eitan, former Chairman of Iscar who passed away in 2022, was instrumental in the company's growth and the 2006 and 2013 transactions. The most recent verifiable operational shift is the transfer of full principal oversight to the next generation following Eitan's death, positioning Ruthi as the central steward of liquid family capital alongside the enduring industrial-park assets. 7-Main's structural profile is distinct because it functions less as an abstract allocator and more as a direct holder of income-producing real estate tethered to an industrial operating history. While conventional family offices diversify into fund commitments, the Wertheimer office's known holdings remain concentrated in physical assets — commercial property in Israel's coastal corridor, residential real estate in Tel Aviv, and a multinational network of industrial parks — creating a landlord-operator hybrid rather than a conventional portfolio manager.
General information
Firm type
Single Family Office
Year founded
—
AUM
Undisclosed
Location
Region
Middle East
Country
Israel
City
Herzliya
Corporate office
Shanker Arieh 16, Herzliya, Israel
Principals
Ruthi Wertheimer
Principal
Sector focus
Frequently asked questions
Where does the Wertheimer family wealth originate?
The wealth was generated by Stef Wertheimer, who founded Iscar Metalworking in a Galilee shed and built it into one of the world's largest precision carbide tooling manufacturers. The primary liquidity event was the sale of Iscar's parent, IMC Metalworking Companies, to Warren Buffett's Berkshire Hathaway in two tranches — 80 percent in 2006 for $4 billion and the remaining 20 percent in 2013 for $2.05 billion (per Reuters, 2013). Earlier, the family sold Blade Technologies International Group to Pratt & Whitney, adding a second industrial exit to the capital base.
What does 7-Main actually invest in?
Based on identifiable holdings, 7-Main concentrates on direct real estate and industrial infrastructure rather than fund commitments or liquid securities. The portfolio includes a commercial office building at Shanker Arieh 16 in Herzliya, a residential property on Ahavat Zion Street in Tel Aviv, and an ownership stake in the Tefen and Nazareth industrial parks. A broader network of industrial parks across Israel and Turkey forms the cross-border backbone of the asset base.
Who runs investment decisions at 7-Main?
Ruthi Wertheimer, daughter of founder Stef Wertheimer, is the principal of 7-Main. She studied industrial design at the Bezalel Academy of Arts and Design and later completed the Advanced Management Program and Owner/President Management Program at Harvard Business School. Her brother Eitan, who chaired Iscar and guided the company through the Berkshire Hathaway acquisition, passed away in 2022, making Ruthi the central decision-maker for the family office.
Is 7-Main structured as a single-family office or does it operate differently?
7-Main operates as a single-family office for Ruthi Wertheimer, distinct from the broader Wertheimer family's industrial operations and the Stef Wertheimer Philanthropic Initiatives. The office's structure is unusually asset-heavy for a family office: it directly owns and manages commercial and industrial real estate rather than acting as a pure capital allocator. This blurs the line between an investment office and a direct operating-company landlord.
How is the Wertheimer philanthropic activity separated from the family office?
The family's civic and educational initiatives, including the development of the Tefen and Nazareth industrial parks as economic-development projects, operate under Stef Wertheimer's philanthropic umbrella. While 7-Main holds ownership stakes in some of these park assets, the operating and charitable dimensions were historically managed by Stef and Ruthi Wertheimer through dedicated philanthropic vehicles rather than through the family office's investment entity.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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