What is the Citadel Internship?
Citadel runs two distinct internship programmes - one at Citadel (the multi-strategy hedge fund) and one at Citadel Securities (the market maker). They are different companies with different hiring pipelines, different work, and different cultures, though both fall under Ken Griffin's umbrella. Together they hire roughly 300 to 400 interns per summer globally, making the Citadel programme one of the largest competitive quant internships - significantly larger than Jane Street, smaller than Two Sigma.
The internship is the dominant route into Citadel's full-time graduate programme. Return offer rates sit around 65 to 75% (lower than Jane Street's 80%+, higher than the bank standard of around 50%).
This guide covers the application timeline, intern compensation across offices, what interns actually work on at each entity, and how to maximise your chances of converting. For the full interview content (the OA, the probability questions, the C++ depth), see our Citadel interview guide.
The Internship Programmes
Citadel (the hedge fund)
- Quantitative Researcher Internship. Research-focused work on signal design, alpha generation and risk modelling. Highly competitive - typically 30 to 50 interns per summer globally.
- Software Engineering Internship. Engineering work supporting research and trading infrastructure. Larger - around 80 to 120 interns globally.
- Investment Analyst Internship. Fundamental analysis for the discretionary equities or fixed income teams. Smaller - typically 20 to 30 interns.
Citadel Securities (the market maker)
- Quantitative Trader Internship. Trading-focused work, including manual market making under supervision and a research project. Typically 20 to 40 interns globally.
- Quantitative Researcher Internship. Similar to Citadel's quant research role but focused on market-making strategies and execution. Around 30 to 50 interns.
- Software Engineering Internship. Engineering for market-making infrastructure - low-latency systems, order management, real-time pricing. Around 80 to 120 interns.
Application Timeline
| Stage | Timing |
|---|---|
| Applications open | August (year before internship) |
| Online assessment | September to October |
| First-round interviews | October to December |
| Final-round Super Day | November to January |
| Offers extended | January to February |
| Internship begins | June (typically the first or second week) |
| Return offer decisions | August (last two weeks of internship) |
Applications for the 2027 summer internship will open in August 2026. Apply early - Citadel reviews applications on a rolling basis and the most competitive offices fill up first.
The Interview Process
The interview process for the internship is largely the same as for the full-time graduate role - see our Citadel interview guide for the full breakdown. Internship-specific notes:
- The OA bar is high. Citadel's online assessment for interns is broadly the same as for full-time. Around 70% of applicants do not pass.
- The Super Day involves 4 to 6 interviews. Held either at a Citadel office (London, Chicago, New York, Hong Kong) or virtually. Each interview covers a different domain (probability, coding, market intuition, behavioural).
- The bar is calibrated for university juniors and final-year students. You are not expected to have prior trading or research experience. The firm is testing aptitude and learning curve, not track record.
Intern Compensation
Citadel's internship pay is among the highest in the industry, broadly competitive with Jane Street on cash though the in-kind benefits are slightly less generous.
| Office | Programme | Total summer compensation (2026) |
|---|---|---|
| Chicago | Quantitative Researcher / Software Engineer | $20,000 to $25,000 monthly stipend |
| New York | Quantitative Trader (Citadel Securities) | $20,000 to $25,000 monthly stipend |
| London | Quantitative Researcher | £14,000 to £18,000 monthly stipend |
| Hong Kong | Software Engineer | HK$140,000 to HK$180,000 monthly stipend |
Add to that:
- Furnished housing provided at no cost in Chicago, New York and London
- Flights covered to and from the office at the start and end of the internship
- Daily lunch and dinner provided at the office
- Curated professional development sessions - speaker series, mentorship pairings, regular networking events with senior leadership
The all-in package for a 10 to 11 week Chicago or New York internship typically lands around $70,000 to $80,000 in cash, with another $12,000 to $18,000 in in-kind value.
For broader internship comparison, see our Jane Street internship guide and quant jobs complete guide.
What Interns Actually Work On
Citadel Quantitative Researcher Interns
- Assigned to a specific research team for the full internship
- Given a real research problem - typically signal design, alpha decay analysis, or risk model improvement
- Work within Citadel's research infrastructure (Python, the firm's proprietary backtesting platform, internal data lakes)
- Present findings to the team at the end of the summer
Citadel Securities Quantitative Trader Interns
- Rotate through 1 to 2 trading desks across the summer
- Assigned a manual trading exercise with small risk limits and supervision
- Build or extend a market-making model as a capstone project
- Present to senior traders at the end of the summer
Software Engineering Interns (both entities)
- Join a specific engineering team for the full internship
- Receive a real project that ships to production within the 10 to 11 week window
- Past intern projects (publicly discussed at university talks): performance optimisations to the trading engine, new tools for the research workflow, additions to the firm's cloud infrastructure
The Return Offer Process
Citadel's return offer rates are around 65 to 75% (lower than Jane Street, higher than most banks). The decision is made in the final two weeks of the internship, based on:
- Manager and team feedback. What did you ship? What was its quality? How did you work with the team?
- A formal end-of-internship review. Typically 30 minutes with your manager and one or two senior people from the team.
- Performance on the capstone project (where applicable). Trading interns and research interns are explicitly evaluated on their summer project.
Return offers are typically extended by mid-September. You usually have until mid-November to accept. Compensation is the standard graduate package: first-year quant researchers in London typically receive £150,000 to £250,000 in total compensation; in New York and Chicago, $250,000 to $400,000.
For full-time salary detail across roles and firms, see our quantitative analyst salary guide.
How to Prepare
The interview content is the same as the full-time graduate process. See our Citadel interview guide for the full preparation plan, recommended reading, and practice problem categories.
Internship-specific additions:
- Apply on day one of the cycle. Citadel's recruiting is rolling. The earlier you apply, the more likely you are to get an interview slot.
- Get specific about which entity and team. Citadel and Citadel Securities are different companies with different cultures and different work. Generic answers about wanting to work at "Citadel" suggest you have not researched the difference. Be specific.
- For the Super Day, prepare specific questions. Citadel's interviewers expect you to ask substantive questions back. Specific questions about the firm's strategies, recent moves, or the team's current research agenda signal preparation.
What Citadel Looks For in Interns
Three traits separate Citadel offers from rejections at the internship stage.
Speed of thought. Citadel's interviews move fast. Candidates who take five minutes to start a probability problem - even if they eventually get the right answer - often don't pass. You need to recognise problem types quickly and begin structuring your approach within seconds.
Communication clarity. Interviewers want to follow your reasoning in real time. Mumbling through calculations or jumping to answers without explaining your logic is a red flag. Practise thinking out loud.
Resilience under pressure. Interviewers will push back on correct answers, introduce complications mid-problem, and test how you handle being wrong. Staying calm and adjusting your approach matters more than never making mistakes.
For broader context on what firms look for in early-career candidates, see our quantitative analyst career guide.
Compensation & recruiting notes
Pay ranges in this guide are illustrative estimates from publicly discussed bands and anecdotal reports - not official figures from the employer. Packages vary widely by desk, office, performance, and year. Hiring processes change; nothing here guarantees an interview, assessment format, or offer.
Frequently Asked Questions
When does the Citadel internship application open for 2027?
August 2026. Applications are reviewed on a rolling basis - apply early.
What is the Citadel internship pass rate?
Citadel does not publish figures, but it is widely understood that fewer than 1% of applicants receive an offer. Pass rates at each individual stage (OA, phone screen, Super Day) are reportedly 25% to 35%.
How much do Citadel interns earn?
In 2026, the monthly stipend is $20,000 to $25,000 in Chicago and New York, £14,000 to £18,000 in London. Free furnished housing, daily meals, and flights to and from the office are included.
What is the difference between Citadel and Citadel Securities?
Citadel is the multi-strategy hedge fund (Ken Griffin's investment business). Citadel Securities is the electronic market maker (handles around 25% of US equity volume). They share branding and a CEO but are separate companies with separate hiring pipelines, separate offices in some cities, and different cultures.
What is the return offer rate?
Reportedly 65 to 75%, varying by team, programme, and year.
When does the internship start and end?
Typically June through August or June through early September, depending on the office and the candidate's university calendar. The standard length is 10 to 11 weeks.
Can I do the Citadel internship if I'm not at a target university?
Yes, but it is harder. Strong online assessment scores and demonstrable signals (Codeforces results, ICPC participation, significant open-source contributions) can open the door for non-target candidates. Citadel's OA is the great leveller.
What is the difference between the Citadel and Jane Street internship?
Both are extremely competitive. Jane Street uses OCaml, has a more academic culture, and is heavier on options market making. Citadel is broader (hedge fund and market maker, multiple strategies). Compensation is broadly comparable in cash; Jane Street has marginally more in-kind benefits. We have a Jane Street internship guide covering Jane Street's programme specifically.
Can I apply to multiple Citadel programmes (e.g., quant research at Citadel AND quant trader at Citadel Securities)?
Yes, but be deliberate about it. Each application is reviewed by the relevant team. Generic applications across multiple programmes typically perform worse than tailored applications to one or two specific roles.
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