Summer 2026

Quantitative Research Analyst Intern

Citadel

Citadel

5,001-10,000 employees

Global hedge fund and alternatives manager

Compensation Overview

$112.50 - $145/hr

+ Sign-on bonus + Housing stipend + Company-sponsored travel

Company Historically Provides H1B Sponsorship

Greenwich, CT, USA + 2 more

More locations: Miami, FL, USA | New York, NY, USA

In Person

On-site internships in New York, New York; Miami, Florida; Greenwich, Connecticut.

Bachelor's, Master's

Category
Quantitative Finance (1)
Required Skills
Python
R
Machine Learning
C/C++
Data Analysis

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Requirements
  • Bachelor's or master's degree in mathematics, statistics, physics, computer science, or another highly quantitative field
  • Strong knowledge of probability and statistics (e.g., machine learning, time-series analysis, pattern recognition, NLP)
  • Prior experience working in a data driven research environment
  • Experience with translating mathematical models and algorithms into code (Python, R or C++)
  • Independent research experience
  • Ability to manage multiple tasks and thrive in a fast-paced team environment
  • Excellent analytical skills, with strong attention to detail
  • Strong written and verbal communication skills
Responsibilities
  • Conceptualize valuation strategies, develop, and continuously improve upon mathematical models and help translate algorithms into code
  • Back test and implement trading models and signals in a live trading environment
  • Use unconventional data sources to drive innovation
  • Conduct research and statistical analysis to build and refine monetization systems for trading signals

Citadel is an alternative investment manager and hedge fund that oversees capital for institutional clients like pension funds, endowments, and sovereign wealth funds. It uses a team of traders to invest in global financial markets, aiming to grow client assets through speculative opportunities and risk-taking. The firm earns money mainly through performance fees (a share of profits) and management fees (a share of assets under management). Citadel differentiates itself by its track record of profitability, large assets under management, and its focus on improving transparency and resiliency in markets such as the U.S. Treasury market, along with strong risk management and civic leadership. Its goal is to generate high returns for clients while helping maintain fair, efficient markets and expanding its client base and assets under management under leadership from Ken Griffin.

Company Size

5,001-10,000

Company Stage

Private

Total Funding

$15B

Headquarters

Miami, Florida

Founded

1990

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Simplify Jobs

Simplify's Take

What believers are saying

  • Citadel’s flagship fund gained 5.9% in July 2026 after the Situational deal.
  • Bloomberg reported Citadel’s year-to-date gains reached 12% by early August 2026.
  • Dubai becomes Citadel’s 18th city in 2027, expanding recruiting and deal access.

What critics are saying

  • AI crowding drives fast reversals; July 2026’s 67% Situational crash exposed leverage fragility.
  • Citadel abandoned its Portofino trade-secrets suit July 8, 2026, showing costly, unresolved litigation.
  • Miami megaproject execution risk remains high; construction starts in 2026, not yet revenue-producing.

What makes Citadel unique

  • Ken Griffin’s all-weather balance sheet bought Situational Awareness’s leveraged AI book on July 30, 2026.
  • Citadel Securities posted $4.3 billion first-quarter trading revenue, proving elite market-making scale.
  • Citadel is building a $2.5 billion Brickell headquarters, signaling long-term capital commitment.

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Benefits

Health Insurance

Life Insurance

401(k) Retirement Plan

401(k) Company Match

Growth & Insights and Company News

Headcount

6 month growth

4%

1 year growth

4%

2 year growth

4%
eFinancialCareers
Aug 12th, 2026
Morning Coffee: Intense times at the hedge fund with employee pictures on the wall. Another reason to work for Jane Street in Hong Kong.

Morning Coffee: Intense times at the hedge fund with employee pictures on the wall. Another reason to work for Jane Street in Hong Kong. 5 hours ago As the wisdom of motivational posters might have it, the culture of a financial institution is a bit like a teabag. You never know how strong it really is until it's in hot water. When everything is going well, lots of companies are keen to about their unique collaborative and collegiate environment. It's easy to get along when everyone's making money. But more troubled times often make the fault lines extremely obvious. And it seems that hedge fund Marshall Wace, particularly in its credit team, might currently be going through those kinds of times when the flavour seeps out. Marshall Wace has always tried to have a slightly different culture from the typical "pod shop". More collegiate, less aggressive, less... American? Paul Marshall, the co-founder, has pointed to its unusually high average employment duration and culture of cooperation and teamwork rather than eating what you kill and quickly cutting underperformers. His concern with creating the right atmosphere goes right down to taking a personal interest in the interior design of global offices, including portraits on the walls of valued employees in the style of a British pub celebrating its regulars. The trouble is that MW has historically been dominated by its market leading long/short equities franchise, and so when it wanted to build up other asset classes and strategies, that meant hiring people from outside. And new hires often come with their own culture and habits; it's one of the best-known problems in the industry that it's difficult to maintain your culture during a period of rapid growth. Adding to the problems, when MW hired Dan Schatz from Citadel to be the head of credit, Citadel got very angry and lawyered up. Lawsuits are, famously, a massive sink for management time and effort that could be better spent elsewhere; whatever your problems are, a bit of litigation will always make them worse. Just at the time when the credit team needed to be concentrating on developing a strong culture and building relationships, they had this unwelcome distraction. And Murphy's Law dictates that just when it would be really helpful to have a good run of luck in the market, the opposite tends to happen. Performance figures aren't separately disclosed for the main credit strategies, but it might be assumed from the Alpha Plus fund to which they contribute that things haven't been stellar. The end result seems to have been a number of departures from the credit unit over the last couple of years. Of course, these aren't unique issues for Marshall Wace; everyone in finance will go through some periods of adversity, and managing the teething troubles of rapid growth is the whole business of multistrategy investing. It might even be argued that tough times are what build a culture, as well as challenging it. When things stabilise at Marshall Wace, everyone on the credit desk will at least know how their colleagues react when the chips are down. That's actually quite useful. Marshall Wace declined to comment. Elsewhere, some very good news for asset managers in Hong Kong. It seems that they may also benefit from a planned change to the tax law which would effectively replicate the "carried interest loophole" beloved of private equity fund managers. The local tax authorities have made it clear that "The scope of the proposed enhanced tax concessions for funds and carried interest is not confined to particular types of funds or asset managers. Rather, eligibility is dependent on whether the relevant conditions and requirements are met". In plain English, that means that employees will benefit from it as long as they are getting a contractual share of the fund's profits, rather than a discretionary bonus. Which means that there might be some quite difficult decisions to make. Lots of firms, including some very big hedge funds, try to incorporate some element of discretionary payment into their employees' compensation, in order to encourage things like teamwork, management development and good compliance habits. But if this makes a big tax difference, the employees will be very resistant. Firms like Jane Street and Citadel are already likely to be on the right side of that line, but many other asset managers and family offices might end up deciding that although they don't like formula-driven compensation, they can't afford not to give it. Meanwhile... Driss Haj Khalifa, formerly head of euro swaps at Bank of America in Paris, has gone to Susquehanna in London. Lots of sell-side traders seem to have made this move to macro and multistrategy hedge funds in the last year. (Financial News) It's going to be a bumpy few years for the hard working men and women in investment banking HR in the UK. The cap on compensation at employment tribunals is going to be removed, and the minimum period of employment before someone can bring one will be shortened from two years to six months. At the same time, stricter rules on the duty to prevent sexual harassment at work are likely to be translated into non-financial conduct regulations. (The Banker) "Who needs income when you have wealth?" The strong performance of the stock market has had an unexpected effect - boomers are finding that they have enough savings to take early retirement. (WSJ) Because there are so few ECM deals in their domestic market, London law firms are having to provide secondments to Asia and Europe for their junior staff so that they don't lose their expertise. (Financial News) Most people react to a colleague showing up with a holdall of sweaty gym gear simply by complaining or making sarcastic remarks. Former Citadel trader Maria Cabral Menezes saw it as a possible opportunity to quit and launch a business selling "dry shampoo for clothes". (Business Insider) Someone is suing Kalshi for launching prediction markets on flight cancellations, pointing out that it is almost certainly going to lead to someone doing something stupid or dangerous in order to benefit their trading book. (WSJ) Follow me on X. Follow me on LinkedIn. Have a confidential story, tip, or comment you'd like to share? Contact: +44 7537 182250 (SMS, Whatsapp or voicemail). Telegram: @SarahButcher. Signal: sarahbutcher.22 Click here to fill in our anonymous form, or email [email protected]. Bear with us if you leave a comment at the bottom of this article: comments are moderated intermittently by human beings. Sometimes these humans might be asleep, or away from their desks, so it may take a while for your comment to appear. You must take sole responsibility for comments you post on this site. We will take reasonable steps to weed out anything that we consider to be offensive or inappropriate. The essential daily roundup of news and analysis read by everyone from senior bankers and traders to new recruits. Boost your career. Find thousands of job opportunities by signing up to eFinancialCareers today.

The Digital Track
Aug 6th, 2026
Crypto markets steady as cyberattacks hit major Wall Street hedge funds.

Crypto markets steady as cyberattacks hit major Wall Street hedge funds. August 6, 2026 Cryptopolitan general Neutral Crypto markets are holding steady this week as a wave of cyberattacks targets major Wall Street hedge funds, including Point72 Asset Management, Citadel, Two Sigma Investments, and Millennium Management, signaling a broader escalation in financial sector cybersecurity threats. While traditional finance absorbs the shock of these coordinated breach attempts, digital asset markets including BTC and ETH are showing resilience, reinforcing the narrative that crypto and decentralized finance can operate independently of legacy financial infrastructure vulnerabilities. The incidents raise urgent questions about institutional cybersecurity, data protection in high-frequency trading environments, and the comparative security of blockchain-based assets versus centralized Wall Street systems. For crypto investors watching institutional adoption trends, the fact that some of the world's most sophisticated and well-resourced hedge funds remain vulnerable to cyberattacks highlights the systemic risks embedded in traditional finance. This development is particularly relevant now, as institutional money continues to flow into crypto markets and comparisons between centralized and decentralized financial systems intensify. The crypto market stability amid Wall Street cyber threats may strengthen the case for Bitcoin and other digital assets as uncorrelated, censorship-resistant stores of value. Investors should monitor whether these cyberattack attempts result in confirmed data breaches or financial losses, as any such disclosures could trigger broader market sentiment shifts and potentially accelerate institutional interest in blockchain-based security solutions and decentralized asset custody. This week, several of the largest hedge funds on Wall Street were targeted in a wave of attempted cyberattacks, which reportedly include Point72 Asset Management, Citadel, Two Sigma Investments and Millennium Management.

Gizmodo
Aug 5th, 2026
AI-Powered 'vishing' attacks reportedly targeted top hedge funds.

AI-Powered 'vishing' attacks reportedly targeted top hedge funds. Turns out rogue AI isn't the only cybersecurity threat to be worried about. By Webb Wright Published August 5, 2026, 3:39 pm ET Reading time 2 minutes Amid all the recent reports of AI systems autonomously going off the rails and hacking into third-party organizations, it's almost easy to forget that human hackers are still out there, experimenting with AI in all kinds of nefarious ways. A new report from Bloomberg, however, is a reminder of just how quickly AI-enabled cybercrime is evolving - and how unprepared the world is to deal with it. According to the report, a litany of high-profile hedge funds, including Citadel and Two Sigma, were targeted by recent voice phishing, or "vishing," attacks, in which AI is used to simulate the voices of actual humans in an attempt to skirt security systems. Several private equity firms were also reportedly targeted. Two Sigma told Bloomberg it caught the attack in time before any of its internal systems were compromised. Citadel declined Gizmodo's request for comment. Point72, another hedge fund included in the attack, did not immediately respond to a comment request. IT experts have been warning for years that the proliferation of cheap, easy-to-use AI tools that mimic human speech or generate other kinds of deepfake content will escalate both the severity of scam attempts and the rate at which they occur. The world got a taste of this in 2024, when an employee at the Hong Kong branch of a multinational company was duped into wiring more than $25.5 million to scammers who had instructed her to do so using AI-generated deepfakes of company employees, including its chief financial officer. AI scams are also being deployed to tip political scales. Last summer, for example, someone (or a group of people working together) used AI to recreate the voice of Secretary of State Marco Rubio and then sent voice messages to foreign diplomats and federal officials. OpenAI also said in a June report that a fleet of scammers, all of whom appear to have been backed by the Chinese government, had been illicitly using ChatGPT to generate inflammatory social media content aimed at fueling Americans' resentment towards data centers, the power cells of the United States' AI industry. All the while, the market pressures of the AI race - combined with a total lack of federal regulation - have been pushing tech developers to build increasingly capable models, including ones designed to imitate human speech. (Such tools are often promoted as "companions" that can alleviate loneliness, even though research has indicated they can sometimes have the opposite effect.) OpenAI's latest voice model, GPT-Live-1, is engineered to imitate subtle nuances of human speech, and, in theory, make interacting with AI feel less awkwardly mechanical. By design, OpenAI's model cannot imitate the voices of real people; that was a lesson OpenAI had to learn the hard way after it received earlier public blowback for releasing a voice model that, to many people's ears, sounded a lot like Scarlett Johansson. This is all to say: Nobody should be surprised that vishing attacks are on the rise. Technologically-enabled scam artistry is a tale as old as time, and AI is arguably the most enabling tool ever invented in that regard. The real mystery is why more isn't being done to build actually effective safeguards into AI systems to prevent them from happening in the first place.

Taipei Times
Aug 3rd, 2026
Citadel's Griffin buys Situational Awareness fund after 67% AI stock loss

Citadel founder Ken Griffin purchased a portion of Situational Awareness's portfolio after the California hedge fund suffered a 67% loss in February from soured AI stock bets. The fund was forced to unwind most of its $16 billion public equities book. Griffin assembled senior Citadel executives who worked through the night to analyse Situational Awareness's trading positions and liquidity. By Thursday, Citadel had acquired part of the portfolio. Leopold Aschenbrenner, Situational Awareness's founder and former OpenAI researcher, told investors he took "full responsibility" for the losses. He said positions moved against the fund whilst market liquidity dried up. The acquisition follows Griffin's pattern of identifying distressed opportunities. Forbes estimates his personal fortune at approximately $52 billion. Representatives for both firms declined to comment on the transaction's financial terms.

The Edge Media Group
Jul 31st, 2026
Citadel buys most of Situational's stock holdings after AI share rout - Reuters

Citadel buys most of Situational's stock holdings after AI share rout - Reuters. 31 Jul 2026, 03:09 pm Citadel founder and CEO Ken Griffin. NEW YORK (July 30): Situational Awareness, an AI-focused hedge fund run by former OpenAI researcher Leopold Aschenbrenner, sold the bulk of its stock portfolio to Ken Griffin's Citadel after being battered by heavy losses in its tech holdings, two sources familiar with the matter told Reuters on Thursday. Situational was forced to unwind most of its public equities portfolio, which included sizable holdings in several prominent AI names that have been rocked by the recent market selloff, the sources said, requesting anonymity as the discussions are confidential. The fund was under pressure to either raise fresh capital from investors or offload its entire book, and eventually chose the latter option, the sources added. Situational held positions in several prominent tech names including Broadcom, Intel, and CoreWeave, according to its most recent regulatory filings. Since the fund's launch in 2024, Aschenbrenner has garnered a cult-like following among investors for his prescient bets on the AI sector that propelled his fund to a lofty 439% return from the start of the year until the end of June. The fund was down around 67% so far in July after incurring heavy losses on AI stocks, the Wall Street Journal reported on Thursday, citing a source who saw a letter the firm sent to investors. Aschenbrenner blamed short sellers who targeted the firm's positions for exacerbating losses, the report said. The firm did not immediately respond to Reuters request for comment outside business hours. A number of top Wall Street prime brokers, including Goldman Sachs, JPMorgan Chase, Bank of America, and Citigroup, helped facilitate the deal between Citadel and Aschenbrenner's fund, the sources told Reuters. Griffin's Citadel, which has about US$71 billion of assets under management, is one of the world's most profitable and largest hedge funds. As part of the deal, Citadel is picking up the portion of Situational's public portfolio that was financed by leverage from brokers, the sources said. They said Situational will hold a book of roughly US$10 billion after the deal comprised of stocks as well as private investments in companies like Anthropic. Situational has not sold its stake in Anthropic, the sources said. AI meltdown. Global hedge funds are grappling with their biggest monthly drawdown on record as AI stocks have been routed across the board, erasing much of the gains from crowded bets in the sector. Asia-focused fundamental long-short funds are down 18.6% on average this month through July 28, Goldman Sachs said in a prime brokerage note sent to clients this week. Stock-picking hedge funds have been rushing to unwind their positions in AI names, as they covered short positions and sold long positions in relatively equal amounts, according to a note from Morgan Stanley's prime brokerage unit sent to clients on Wednesday. Hedge funds typically take on large amounts of leverage from lenders to take bigger swings at the markets in order to amplify their returns. However, such leveraged bets can backfire when the markets move against positions taken by funds, forcing margin calls from prime brokers. That can result in a vicious cycle, where the margin calls trigger sales, extending market downturns that beget more selling. It is not clear whether Aschenbrenner's fund faced margin calls from its lenders before striking the deal with Citadel. The hedge fund, which earlier managed about US$20 billion of assets and currently has about 20 employees, has used leverage to boost its positions in the past - much like its peers. Aschenbrenner's success attracted big-name backers like secretive trading giant Jane Street. Other investors include Stripe co-founders Patrick and John Collison, as well as Meta Platforms executives Daniel Gross and Nat Friedman. The Wall Street Journal reported the deal between Citadel and Situational earlier on Thursday. Uploaded by Liza Shireen Koshy