Family Office Direct Investments Fell in September
Private investment firms completed 42 direct company deals last month, a decline from the 52 recorded in August.
Updated on Oct. 1, 2026 in Investing
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Billionaire family offices executed 42 direct investments into companies during September 2026. This activity followed 52 similar direct investments made by these firms throughout August.
Why it matters
Investors are increasingly directing capital toward firms with proven records in applying emerging technologies like AI and geothermal energy. This shift reflects a move toward backing companies that have already demonstrated operational milestones.
Family offices completed 42 direct investments in September, down from 52 in August. Notable capital commitments included a $3.4 billion round for Mistral and $135 million for Mazama Energy.
The players
Hillspire
A family office that provides capital to high-growth technology ventures and participated in the Mistral funding round.
Duquesne Family Office
An investment firm that manages private wealth and recently backed Fab2 and Precision Neuroscience.
Mazama Energy
A geothermal developer that utilizes hot rock drilling techniques and recently closed a $135 million Series B round.
Bill Gates
An investor who oversees a private venture capital firm that participated in the Mazama Energy funding round.
The details
Family offices focused on capital-intensive technology sectors, including semiconductors, brain-computer interfaces, and geothermal energy production. For instance, Mazama Energy secured $135 million in Series B funding to advance its process of circulating water through hot rock to generate electricity, after reaching 629°F at its Oregon pilot site in 2025. Other significant deals included a $500 million Series A for Fab2 and a $250 million Series D for Precision Neuroscience, which develops neural implants.
Timeline
In 2025, Mazama Energy reached 629°F at its pilot site in Oregon.
During August 2026, family offices completed 52 direct investments.
In September 2026, family offices completed 42 direct investments.
Money Landscape
This decline follows a broader trend of private wealth allocations into deep-tech infrastructure. The activity sits within a cycle of high-stakes funding for firms applying AI and energy innovation to industrial challenges.
While these direct investments are restricted to billionaire family offices, they signal which technology sectors and firms are currently attracting institutional capital. For personal financial planning, consult with a professional regarding exposure to private market trends or venture-focused funds.
The takeaway
The pivot toward companies with proven technological applications suggests a growing investor preference for tangible operational results. Consider reviewing your own portfolio diversification with a financial professional to ensure your risk tolerance aligns with long-term technology growth trends.
Further reading
Learn more about the latest market movements in our Investing section.
Source note: This article includes information reported by CNBC.
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