Family offices · United States
Stanley Druckenmiller's Family Office: Duquesne Explained
Duquesne Family Office LLC is the New York family office of investor Stanley Druckenmiller, who turned his hedge fund firm Duquesne Capital Management into a family office in 2010, according to Bloomberg. Bloomberg reports that he is its chairman and chief investment officer and that it managed about US$10.8 billion in December 2024. Its SEC Form 13F for 30 June 2026 lists 95 entries with a reported value of about US$5.2 billion, led by Natera. [1, 2, 3]
At a glance
| Family | Druckenmiller family |
|---|---|
| Founded | 2010 (as a family office) |
| Headquarters | New York, New York, USA |
| Run by | Stanley Druckenmiller, chairman and chief investment officer |
| Size | About US$10.8 billion (Bloomberg, December 2024); 13F value about US$5.2 billion (30 June 2026) |
| Structure | Single family office (Delaware LLC); files Form 13F with the SEC |
| Known for | Natera, Taiwan Semiconductor, STMicroelectronics, Insmed (13F, 30 June 2026) |
How did Duquesne Family Office start?
Stanley Druckenmiller managed outside money through his hedge fund firm, Duquesne Capital Management, until 2010. According to Bloomberg, he decided to close the hedge fund in 2010, tired of the stress of managing other people's money, and converted it into a family office, a New York investment group he started with US$3 billion. Bloomberg's profile gives two start years for Duquesne Capital: 1981, with US$1 million in separate accounts, and 1986. [3]
Reported by the sources named, not confirmed by an official source.
Who runs Duquesne Family Office?
Bloomberg describes Stanley Druckenmiller as chairman and chief investment officer of Duquesne Family Office. Its 13F filing of 17 February 2026 was signed by Sue Meng, General Counsel. [3, 4]
Reported by the sources named, not confirmed by an official source.
How big is Duquesne Family Office?
According to Bloomberg, Druckenmiller managed about US$10.8 billion through the family office in December 2024. The office's Form 13F for the quarter ended 30 June 2026, filed with the SEC on 14 August 2026, lists 95 entries whose values add up to about US$5.21 billion; the filing for 31 December 2025 reported US$4.49 billion across 62 entries. A 13F shows only US-listed stocks and similar securities (including ETFs, ADRs and listed call and put options) held at the end of a quarter; it does not show short positions, cash, bonds, currencies, futures, private investments or assets traded outside the US, so it is not the size of the whole office. [1, 2, 3, 4]
What does Duquesne Family Office invest in?
The 13F for 30 June 2026 is concentrated: Natera is the largest entry at about US$865 million, around 17% of the reported total, followed by Taiwan Semiconductor ADS (US$282 million), STMicroelectronics (US$232 million), Insmed (US$152 million in shares plus call options on US$144 million of shares) and YPF ADS (US$143 million). The same filing lists call options on ETFs, including the Invesco S&P 500 Equal Weight ETF (US$175 million of underlying shares) and the iShares MSCI Brazil ETF (US$146 million). At 31 December 2025 the second-largest entry was the State Street Financial Select Sector SPDR ETF (US$301 million); it does not appear in the June 2026 filing. [1, 4]
How is Duquesne Family Office set up and regulated?
Duquesne Family Office LLC, a Delaware company according to its SEC filing records, files quarterly Form 13F reports with the SEC as an institutional investment manager, from 40 West 57th Street, 25th Floor, New York, NY 10019 (CIK 0001536411, 13F file number 028-14660). Bloomberg describes it as the office through which most of Druckenmiller's money is managed. The basis of any exemption from SEC adviser registration was not confirmed. [2, 3, 5]
What changed in 2025 and 2026?
Between the 13F for 31 December 2025 and the 13F for 30 June 2026, the reported total rose from US$4.49 billion (62 entries) to about US$5.21 billion (95 entries), and the Financial Select Sector SPDR ETF position no longer appears. No change of leadership, structure or offices was found for 2025 or 2026. [1, 4]
