American hedge fund arm of Citadel, led by Ken Griffin
Business Insider UK reports Freestone’s energy team is disbanded as management shifts focus to other sectors; Pope’s departure follows a broader firm expansion, with mixed 2025 gains and 2026 losses easing into gains in H1.
Sotheby’s has sold a 67‑million‑year‑old Tyrannosaurus rex skeleton nicknamed “Gus” for $50.1 million, the highest price ever paid for a dinosaur at auction. The specimen, about 61–63% complete, was excavated in South Dakota from 2021–23; scientists are warning that private ownership will restrict research access.
Miami-Dade County has seen 24 sales of properties above $30 million in H1 2026, roughly double the prior year, fueling expectations to surpass 2025’s record. The rise is tied to tax policy debates and growing tech presence, including Alphabet’s Miami expansion.
A high-profile AI-focused hedge fund has unwinded after massive leverage and a momentum crash. Citadel has stepped in to acquire many of its publicly traded holdings while the fund holds private investments, including Anthropic. Regulators and investors watch for how this affects AI infrastructure bets and market risk.
New York City’s pied-à-terre tax is under court challenge after a Staten Island judge temporarily halted its rollout. Mayor Mamdani defends the policy as a revenue tool while President Trump has called for federal intervention. The city plans an appeal, arguing the pause threatens time-sensitive implementation.
JPMorgan Chase Chief Executive Jamie Dimon has warned that market leverage remains elevated, with hidden borrowing amplifying potential disruptions as analysts scrutinise leveraged ETFs and AI-driven bets. The remarks come amid recent stress at Situational Awareness and regulatory moves in Korea.
Wall Street has committed vast capital to AI projects while US equity indexes have hit fresh records and volatility sits near year-to-date lows. Big investors have lined up roughly $500 billion to finance AI build-outs linked to Nvidia, and the heavily leveraged hedge fund Situational Awareness has lost around 67% in a month and sold much of its public book to Citadel.
AGoogle‑reported campaign shows hackers using voice phishing to target private equity firms, law firms and ratings agencies, stealing passwords and MFA codes via spoofed help desks. Several victims reportedly paid ransoms; researchers warn that the human element remains the biggest weakness in corporate security.
Jane Street says it has reduced risk exposure in AI-related trades after a July downturn that hit AI-heavy holdings, with the firm aiming to be more selective about risk in its portfolios.
Carnegie Mellon University has announced a $3 billion gift from Ken Griffin, including $2 billion to establish a new 35-acre campus in Miami's Wynwood district. Construction will start next year, with enrollment planned for around 3,500 students. The project centers on grand challenge areas like health, national security, energy, and manufacturing, while Pittsburgh’s CS program will also receive funding and renaming.