Ken Griffin

Ken Griffin’s hedge fund made billions last week. This profit occurred after his fund bought the bulk of Situational Awareness’s stock book.

Ken Griffin's Citadel achieved its best monthly performance in years in July after acquiring the majority of Situational Awareness's public-stock portfolio. The acquisition occurred late last month, contributing to the firm's significant gains.

Citadel's stock surged 6% following its acquisition of Situational Awareness. Ken Griffin’s fund purchased billions of dollars of AI stocks from Leopold Aschenbrenner’s firm.

Demolition of three buildings is underway on Park Avenue and East 52nd Street for a new skyscraper. Ken Griffin’s project with Vornado will feature two Griffin-controlled Citadel companies as anchor tenants, occupying at least 850,000 square feet.

Mayor Zohran Mamdani has extended the deadline for New York City homeowners to apply for exemption from the pied-à-terre tax until Sept. 18, which targets high-value homes over $5 million not used as primary residences. The tax, part of a state law signed by Governor Kathy Hochul, faces pushback from property owners and real-estate groups.

Mayor Zohran Mamdani extended the deadline for NYC homeowners to apply for exemption from the pied-à-terre tax until Sept. 18, giving them an additional month to prove their home is their primary residence. The tax, which targets high-value homes over $5 million not used as primary residences, was extended due to confusion caused by an initial list of 900,000 properties.

New York City Mayor Zohran Mamdani extended the deadline for homeowners to apply for an exemption from his pied-à-terre tax until September 18. The tax targets secondary properties in NYC valued over $5 million owned by residents living elsewhere, aiming to generate $500 million annually to address the city's budget shortfall. Critics, including wealthy residents and President Donald Trump, have opposed the tax, citing confusion and difficulty in the exemption process.

An ex-OpenAI researcher's AI hedge fund lost $35 billion in a week, collapsing from $45 billion to $10 billion. The fund sold leveraged bets on AI infrastructure stocks to Citadel at a discount.

Leopold Aschenbrenner's hedge fund Situational Awareness experienced a dramatic reversal after leveraged AI stock bets led to a 67% loss in July, forcing the sale of assets to Citadel's Ken Griffin. The fund's name and strategy became a viral meme target on social media.

Citadel acquired the majority of Situational Awareness's stock portfolio following an AI rout, as reported. Situational Awareness retained approximately $10 billion in assets, including its stake in Anthropic, after selling leveraged public stock positions to Citadel.

Citadel's acquisition of Situational Awareness triggered a relief rally in global AI stocks, with traders uncertain whether the market has stabilized or if further turbulence is likely.

Ken Griffin’s situational awareness is highlighted as Aschenbrenner’s hedge fund, involved in Wall Street’s AI trade, sells assets to Citadel.

Leopold Aschenbrenner, a $20bn hedge fund manager, experienced a downfall in his career, culminating in a call to Ken Griffin.

A hedge fund founded by Leopold Aschenbrenner sold its stock holdings to Citadel after suffering losses from AI-related jitters, mirroring the 2021 Archegos collapse.

Five Citadel and Citadel Securities employees who joined after graduating share insights on career success, emphasizing the value of internships, taking initiative on impactful projects, and leveraging the firm's non-hierarchical structure. The article highlights the importance of campus recruitment at Ken Griffin's companies, where early hires often become top performers.

New York City Mayor Zohran Mamdani notified property owners of the upcoming pied-à-terre tax on second homes valued over $5 million. The tax, which could raise $500 million annually, applies to over 11,000 properties and targets wealthy individuals like Jeff Bezos, Donald Trump, and Ken Griffin.

Google's founders are purchasing mansions in Miami as they relocate from California amid proposed taxes, while the company expands its office space in the city. Other billionaires are also moving to Miami for its tax-friendly environment.

Miami is attracting wealthy Americans like billionaire Ken Griffin due to tax benefits and luxury properties, but housing affordability is declining, making it difficult for middle-class families to move there. Florida received the most wealth from domestic migrants in 2023, with newcomers averaging $122,530 in annual income, while Miami's median home price is $652,110, requiring incomes of $160,000–$215,000 to afford.

New York City distributed $2.6 billion in cash welfare payments to 864,999 residents in 2025, a 30-year high and 71% increase from 2022. Combined with SNAP, welfare payments totaled $7 billion in 2024. Mayor Zohran Mamdani's policy to tax luxury second homes targeting the wealthy, including billionaire Ken Griffin, sparked controversy.

New York City distributed $2.6 billion in cash assistance to 864,999 residents in 2025, a 30-year high and a 71% increase from 2022. Combined with SNAP payments, total welfare payouts exceeded $7 billion in 2024. Mayor Zohran Mamdani's 2026 budget allocated $14.63 billion for welfare and social services, reflecting continued spending increases.

A 67-million-year-old T. rex skeleton named Gus sold for $50.1 million at a Sotheby's auction in New York, setting a new fossil sale record. The skeleton, found in South Dakota, is 61% complete by bone count and includes rare features like a complete pelvis and both feet. The previous record was held by a Stegosaurus fossil sold for $44.6 million in 2024.

A report by the Peter G Peterson Foundation, using analysis from EY’s QUEST practice, warns that rising U.S. national debt could reduce jobs and wages for Gen Z and Gen Alpha by 2075. EY projects 3.6 million fewer jobs by 2075 under current fiscal trends, with wages declining by 5.3% compared to a stabilized debt scenario.

Anthropic is leasing a 16-story Manhattan building to expand its New York workforce, planning to double headcount to over 1,000 employees by year-end. Airbnb purchased a six-story Gramercy building for $81.5 million to serve as a major New York hub, defying warnings from critics like Bill Ackman and Ken Griffin about the city's business climate.

Republican megadonor Ken Griffin expressed support for Marco Rubio over JD Vance in a hypothetical 2028 GOP presidential primary. Griffin, a major donor to Rubio in 2016, aligns with establishment Republicans favoring Rubio, while anti-establishment factions prefer Vance. Griffin previously supported Nikki Haley over Trump in 2024 and has recently engaged with Trump-aligned circles.

Andrew Tobias, a New York City millionaire and member of the Patriotic Millionaires, supports higher taxes on the wealthy. Mayor Zohran Mamdani's recent tax policies, including a pied-à-terre tax, aim to fund city services but face opposition from some wealthy residents like Citadel's Ken Griffin.

Ken Griffin donated $26 million for the construction of the carbon-neutral Theodore Roosevelt Presidential Library in Medora, North Dakota. The library, designed by Snøhetta, will open in 2026 to commemorate America’s 250th birthday and honor Roosevelt’s legacy of conservation and leadership.

Ken Griffin built Citadel, a commodities empire extending beyond financial trading, emerging from the aftermath of Enron.

The article highlights Mauricio Pocchetino's role as Team USA coach, crediting his position to the financial support of billionaire Ken Griffin. It also notes that Ken Griffin was referenced in a tax-related video by Mayor Mamdani.

Ken Griffin is criticizing New York City Mayor Zohran Mamdani and urging business leaders to speak up against him, while expressing openness to future discussions. Griffin describes Mamdani as a far-left leader and calls for action to 'fight for their city.'

Ken Griffin, a hedge-fund titan, is known for significant spending on properties and political activities. The article highlights his financial influence and expenditures in these areas.

Over 115,900 young professionals applied for Citadel's internship program, resulting in a record-low 0.36% acceptance rate with 350 interns selected. Citadel and its sister firm, Citadel Securities, offer high salaries ($4,300–$5,800 weekly) and real business responsibilities, with most interns likely to receive full-time offers after the 11-week program.

Citadel and Citadel Securities accepted 0.36% of interns from over 115,900 applicants, forming their largest class of 350 interns. The interns, primarily from technical backgrounds and top universities, include PhD holders and focus on quantitative research, trading, and engineering. The firms emphasize hiring young talent despite AI-driven workforce changes.

New York's wealthiest residents are not financially supporting efforts to counter the left's growing political influence, despite recent democratic socialist gains and tax policy disputes. Republicans are struggling to secure funding for key candidates like Bruce Blakeman, as swing districts and moderate Democratic incumbents remain critical in shaping state and national policies.

Ken Griffin's New York City property tax bill is set to increase by $1.4 million due to a pied-à-terre tax on luxury second homes. The tax was implemented by Mayor Zohran Mamdani and Gov. Kathy Hochul.

A bond trader is betting on a Federal Reserve interest rate hike, which will be tested by upcoming jobs data. Vornado Realty Trust's office tower development in New York City for Citadel faces risks due to Mayor Zohran Mamdani's proposed tax changes.

Citadel Securities lost a court case challenging a new IEX options venue. The firm's first-half net trading revenue fell 35% compared to the previous year's surge, as it competes with major banks.

New York City has passed a pied-a-terre tax targeting owners of second homes, with Citadel CEO Ken Griffin highlighted as a prominent figure associated with the policy. The tax, proposed by Mayor Zohran Mamdani, aims to address luxury housing ownership and affordability issues.

Zohran Mamdani disclosed an embarrassing snub from Ken Griffin and reaffirmed his commitment to implementing higher taxes on billionaires, including Jeff Bezos.

New York City Mayor Zohran Mamdani has not received a response from Citadel CEO Ken Griffin after attempting to reconcile over a controversial video criticizing Griffin's Manhattan penthouse. Mamdani proposed a 'pied-à-terre tax' on wealthy property owners, which Griffin called 'creepy and weird,' prompting backlash. Mamdani emphasized his willingness to engage with business leaders to address affordability crises in the city.

Mamdani addressed CNN on Tuesday, admitting Ken Griffin avoided him after a viral video but maintained his stance that billionaires like Jeff Bezos should pay higher taxes. He criticized Bezos' argument that increased taxation wouldn't benefit a teacher in Queens.