Schlumberger Limited (SL)

There is no single family office. The Schlumberger fortune is managed through separate entities for different family branches. Clerville Investment Management handles the direct Schlumberger line, while Primwest Holding NV manages assets for the Primat branch. Each vehicle operates with its own investment committee and mandate.

Rather than a centralized multi-asset portfolio, the family operates a distributed network where each branch pursues independent strategies. The Primat branch, through Primwest, favors direct ownership of European real estate and industrial assets. The de Menil line concentrated heavily on art and cultural institutions. This centrifugal structure reflects the family's European industrial roots, where branches historically managed their own commercial affairs.

The family's fortune originated from the company now known as SLB, which they founded in 1926. While descendants retain some shareholding, the family's direct operational control of SLB has diminished over generations. Today, the family's investment vehicles operate independently from the public company, with their own portfolios of real estate, private equity, and cultural assets.

Yes, the family supports multiple foundations with independent governance. The Schlumberger Foundation operates the Faculty for the Future program, funding women PhDs in STEM from developing countries. The Menil Foundation manages the Menil Collection in Houston — a world-class art museum — while the Dia Art Foundation received significant early support from the de Menil branch. These are legally distinct from the family's investment vehicles.

The Seydoux family, heirs to the Schlumberger fortune through marriage, are prominent in French cinema. They hold controlling interests in Pathé and Gaumont, two of Europe's oldest film studios. This branch of the family operates largely within the media and entertainment sector, distinct from the real-asset focus of the Primat line or the cultural philanthropy of the de Menils.

The family's known investments concentrate on tangible hard assets — hospitality real estate (Domaine des Etangs, Luttrellstown Castle, Primland Resort), European industrial holdings, and cultural assets. There is no public evidence of significant venture capital or technology startup exposure. The investment posture prioritizes multi-generational capital preservation over high-growth speculation.

The family's wealth management operates across multiple jurisdictions. Primwest Holding NV is structured in the Netherlands, with asset management activity concentrated in France and Ireland. Clerville Investment Management appears tied to the US-based Schlumberger line. The underlying assets span France, Ireland, the United States, and the Netherlands, reflecting the family's transatlantic footprint since the company's early expansion.