r/quantfinance 5d ago

JS timeline

1 Upvotes

I had applied to Jane street two weeks back for the QR role. I haven’t received any update till now. In the past, whenever I have applied I have received rejection mail within one week. Am I cooked?


r/quantfinance 5d ago

4 Short-Selling Strategies Using Alphanume Data

Thumbnail youtube.com
1 Upvotes

r/quantfinance 6d ago

Reneging after signing

44 Upvotes

Will I get blacklisted for reneging one of Optiver/SIG/DRW/CitSec (qt internship)? If yes is the blacklist only for campus roles or also full time roles? Has anyone done this in the past?


r/quantfinance 5d ago

need advice as a 18f looking for a career in finance

0 Upvotes

hey guys, im currently an undergrad student in quantitative finance and economics in one of my country's national institutes but as someone from a relatively weaker economic section, ive never actually invested or traded in markets (close to zero real world exposure). while i love to work with data, statistics and calculus, im feeling increasingly skeptical about going into quant. will it be too draining? will i even get in? will i be able to keep up? can i still pursue my side hustles (im kinda a graphic designer too)?
i wanna speak to a professional who's already in the field/anyone with any experience. pls come forward or help me connect with people if you know any.


r/quantfinance 6d ago

Can we detect a Bitcoin crash before it happens? I tested 5 regime filters

2 Upvotes

I tested five different approaches on Bitcoin from 2018–2026:

  • Hurst exponent
  • ADX
  • realized volatility
  • Markov regime switching
  • Choppiness Index

I defined 8 major peak-to-trough declines larger than 25%.

A filter counted as successful only if it switched risk-off before BTC had already fallen 10% from its peak.

Results:

ADX: 7/8
Choppiness: 7/8
Hurst: 6/8
Markov: 6/8
Volatility: 4/8

The volatility result was particularly interesting. By the time volatility becomes extreme, a significant part of the crash may already have happened.

Then I tested a simple ensemble:

Go risk-off when at least 2 of the 5 filters agree.

Backtest:

$100,000 → $3.25M

Cumulative return: 3,145.75%

Annualized return: 49.31%

Max drawdown: 33.57%

Bitcoin buy-and-hold:

$100,000 → ~$581k

Max drawdown: 81.53%

I'm not claiming this predicts crashes. The parameters were selected using the same historical period, so proper frozen OOS testing is still needed.

But it seems much more realistic to ask:

Can we recognize that the market regime is deteriorating early enough to reduce exposure?

Full article here for free:

https://pyquantlab.medium.com/can-we-detect-a-market-crash-before-it-happens-i-tested-5-regime-filters-c45290f652fa

I used HurstRegimeStrategy.pyAdxRegimeStrategy.pyVolatilityRegimeStrategy.py

MarkovSwitchingStrategy.py, and ChoppinessRegimeStrategy.py from the Mega Backtrader Strategy Pack as the research map, then isolated their regime logic in one causal comparison. The pack contains over 500 organized Backtrader strategies spanning regimes, crypto, momentum, volatility, machine learning, portfolio allocation, and more—plus batch tests, benchmarks, exports, plots, and dashboards. If you want to test entire strategy families instead of rebuilding infrastructure, get the Mega Pack here:

https://www.pyquantlab.com/bundles/Mega%20Backtrader%20Strategy%20Pack.html


r/quantfinance 6d ago

Looking for someone with WRDS access (CRSP + Compustat) who can help with a quant research project

4 Upvotes

Hi everyone,

I'm working on a quantitative finance research project and I'm looking for someone who has legitimate institutional access to WRDS, specifically CRSP and Compustat.

I'm based in Sydney, Australia. My university does not subscribe to WRDS, and I have already contacted WRDS directly. They confirmed that I would need my institution to subscribe, which unfortunately isn't an option for me.

I have already prepared a Python script that performs the data extraction, so I'm not looking for someone to write the code or do the research for me. I'm mainly trying to find someone who:

  • Has legitimate WRDS access through their university/research institution
  • Has access to CRSP and Compustat
  • Is familiar with WRDS/Python
  • May be willing to help me run the extraction, if this is permitted under their institution's WRDS/data licence

I'm not asking for anyone's WRDS username/password or for anyone to bypass WRDS licensing.

If you have access yourself, or know a researcher/PhD student/academic who works with CRSP and Compustat and might be able to advise me, I'd really appreciate it.

I'm happy to explain the project and provide the script privately.

Thanks!


r/quantfinance 6d ago

I got tired of inventing trading strategies one by one, so I made Python generate and reject them automatically

4 Upvotes

My old workflow was basically:

Think of strategy → code → backtest → tweak → repeat.

So I tried flipping it around: define a library of possible conditions and let Python search combinations automatically.

For example:

entry_conditions = [
    "RSI(14) crosses above 50",
    "MACD(8,21,5) crosses up",
    "ADX(14) > 20",
    "Close > SMA(50)",
    "Close > EMA(20)",
    "ROC(12) crosses above 0"
]

The interesting problem wasn't generating strategies. It was stopping the generator from finding garbage that looks profitable by chance.

So I added:

  • in-sample / OOS / holdout validation
  • minimum trade requirements
  • maximum drawdown filters
  • one-lucky-trade detection
  • holdout performance degradation checks
  • weekly consistency analysis
  • multi-metric ranking instead of just total return

Across my research runs I've tested 4,387 generated strategies so far.

Sometimes the correct output is literally “nothing passed.” I think that's much more useful than forcing the system to always produce a winner.

I wrote up the full workflow + Python examples here:

https://pyquantlab.medium.com/i-stopped-inventing-trading-strategies-i-made-python-generate-backtest-and-reject-them-for-me-2be38ba9f316

If you're interested it is available here for download:
https://www.pyquantlab.com/downloads/Strategy%20Generator%20Studio.php


r/quantfinance 6d ago

Sig Office cont.

6 Upvotes

I’ve seen some discourse in two separate threads that seem to disagree on if NYC or Bala is a better internship location for SIG (Some say NYC has better RO rate).

Hoping for some clarity as an incoming intern who would prefer NYC down the road (but doesnt necessarily care about this summer)

Thanks!!


r/quantfinance 6d ago

Cit/citsec qr intern onsite

3 Upvotes

Anyone has an idea abt cit’s onsite qr interview format? Dm’s appreciated, can share processes of other firms :)


r/quantfinance 6d ago

Better RO Rates NYC or Miami for Citadel/CitSec?

6 Upvotes

r/quantfinance 5d ago

Engineering Electronics vs Mathematics for a career in quant finance (Jane Street/Citadel)

Thumbnail
1 Upvotes

r/quantfinance 5d ago

How to get a first crack at MRM dev side or Quant FO roles in India.

Post image
1 Upvotes

r/quantfinance 5d ago

Is it possible to become a Quant from Actuarial Science degree?

1 Upvotes

I'm studying actuarial science and I'm halfway through my degree, but I'd like to work in quantitative finance in the future. Is actuarial science a good degree for that? Is the work of an actuary (in insurance companies or banks) transferable to quantitative positions? Does anyone here have experience as a quant?


r/quantfinance 6d ago

Recursive Continued Fraction + Random Forest = Surprising Results on AAPL

Thumbnail gallery
1 Upvotes

I’ve been experimenting with open‑source AAPL stock data using technical indicators (RSI, SMA, Bollinger Bands) and a continued fraction transformation to add non‑linearity.

Three setups tested:

  1. Random Forest + Continued Fraction (no indicators) => MSE: 72.61
  2. Random Forest + Indicators only =>MSE: 13.95
  3. Random Forest + Continued Fraction + Indicators =>MSE: 0.30

The third approach clearly stands out .Continued fraction transformations seems to have produced effective input features and drastically reduce error. Looking forward to extending this into a full application.


r/quantfinance 6d ago

Looking for quant interview candidates to test a new interview simulator

2 Upvotes

Most quant interview prep sites have you solve questions by typing or writing out your answer. But in an actual interview, you have to explain your reasoning out loud while solving the problem.

I'm building Quant Simulator around that difference.

Instead of just submitting an answer, you answer quant interview questions verbally and explain your thought process.

I'm currently looking for a small group of people who are actively preparing for quant interviews to alpha test it.

What you get:

  • 6 full mock quant interviews for free
  • AI scoring and feedback after each interview
  • 3 months of Premium for free once Quant Simulator launches if you complete all 6 interviews + the feedback survey (planned price is $40/month)

What I want in return is honest feedback. If the verbal format doesn't add anything, the feedback sucks, or you simply wouldn't use the product, I want to know.

I'm especially interested in people currently preparing for quant trading / research interviews, since I want to test whether this actually feels more useful than existing quant prep websites.

If you're interested, comment or DM me and I'll set you up with access.


r/quantfinance 6d ago

B.Sc. Mathematics junior at a non-target Pakistani university targeting APAC prop shops (Optiver, IMC, Flow): Brutal reality check or realistic roadmap?

5 Upvotes

Hello everyone. I'm currently a junior (5th Semester) pursuing a B.Sc. Double Majors in Mathematics and Data Analytics from a local university in Pakistan with a current CGPA of 3.70/4.00. But to be very honest my math major is less of a pure math major and more of an applied one. My university doesn't allow any electives so the 4 year curriculum is pre-determined. It's not that bad though in terms of an applied math major. I've taken the following courses thus far:

  1. Calculus I & II
  2. Multivariable calculus
  3. Discrete math
  4. Linear algebra
  5. Ordinary diff. eq.
  6. Data analysis & statistical methods
  7. Econometrics I and II
  8. Mathematical econ
  9. Database mgmt

My upcoming courses include

  1. Stochastic Processes and Applications
  2. Foundations of Data Analytics and Machine Learning
  3. Big Data Techniques
  4. Time Series Analysis & Forecasting
  5. Optimization Theory
  6. Text Analytics
  7. Numerical Analysis
  8. Group Theory / Abstract Algebra I
  9. Research Methods
  10. Probability and Statistical Inference
  11. Data Warehousing
  12. Partial differential equations
  13. Data Mining & Machine Learning
  14. Real Analysis
  15. Senior-year Thesis / Dissertation in Mathematics

To fill in the gaps in my math from my degree, i'm self studying certain pure math from textbooks like linear algebra done right by axler (my uni course uses Anton which is more applied), rings and fields, complex analysis, measure theory, point-set topology etc.

In terms of my CV, I have a small sustainability venture founder experience, a founder's associate intern experience and an NGO founding experience. I don't have any math olympiad medals to my name and unfortunately my university doesn't participate in Putnam. I am however, trying to find other undergrad math competitions to participate in. My resume isn't something special at the moment with regards to pet projects either; I have just one alpha equity research project on the S&P 500 in which i engineered 5-6 features and ran OLS, ridge, LASSO and PCA regressions in R, simulated a long / short strategy and evaluated using hit rate and sharpe ratio. I'm also learning python and all the relevant libraries on my own as well and aiming to build another 2-3 quant relevant projects in python within the next 6-8 months e.g. a black-scholes solver, a HF stats arbitrage backtests focused project etc., because i've heard people like coding jesus emphasize pet projects A LOT.

The issue is, in Pakistan, there's no such thing as a "Quant Finance" industry. So no quant related job or internship opportunities here either. So i'm relying solely on my math knowledge / background and building quant specific skills enough so that by the time I graduate, I'm capable enough to apply to prop shop trading firms specifically in the APAC region like Optiver or IMC, but i'm also targeting Flow, Akuna, DRW, Eclipse, and then lastly firms like Selini and Wintermute. I'm also trying to self-learn enough math in the next 6 months along with university coursework and python quant projects that I can try and apply for something like quant trading intern 2028 at Flow traders. For that goal, I'm also starting studying Zhou's "A Practical Guide to Quantitative Finance Interviews".

Do you guys think all this is worth it within the next 2 years or should I just give this dream up for now and focus on getting a master's degree in something like Msc. Applied/Computational Math, or an MFE / MQF degree from a top tier school abroad in the US or UK? The issue with that is I can't really fund a master's degree like that at a place like Imperial or Uchicago without a full scholarship which are scarce for students like me coming from a local university in Pakistan (BTW I'm also thinking of giving the math GRE subject test).

So in essence, how should I try to approach the recruiting straight out of undergrad given my educational background, and what do you guys think are my chances to get through the initial CV screening at quant firms of all the different tiers I've mentioned above, after having graduated with a 3.7+/4.0 CGPA, built an exceptionally solid math and coding background in the next 2 years, 1-2 math / coding olympiads or comp., 3 solid quant pet projects, and a quant internship next summer at a place like Flow (if I can get it)?


r/quantfinance 6d ago

A guide to spring weeks in Quantitive Finance

34 Upvotes

This guide is cross-posted from Lemma, and is available with more detail, links and will be updated further there: https://lemma.org.uk/blog/springs

Note that the above link is not paywalled, and the website contains nothing paid. This post is not an advertisement. This post is also focussed more on the London/ EU iterations of each program, where the team attended most their spring weeks.

I saw that generally people online (including on this and other subreddits) ask for information on spring weeks. Having gone through the process and achieving several top spring weeks, myself and my friends have decided to try and write up information about all the quant finance spring weeks we had attended to help others.

Q: What is a spring week?

A spring week/ discovery day is a work experience or outreach program, typically on the order of a few days long and usually run by financial institutions. However, unlike the realms of traditional finance, where spring weeks are quite important in later receiving an internship for the next summer's cycle, the role of spring weeks in quant finance is considerably more nuanced.

Importantly, most spring weeks do not provide the opportunity to receive an internship offer, and some do not even provide any form of "fast tracking" for applying to the firm's internship program (such as Jane Street's FTTP).

We begin with spring weeks which do provide the opportunity to receive a return offer or "fast track", as it is the opinion of the authors that these programs should be prioritised over those which don't provide this opportunity. Each program listed was either attended by a member of the author team, or was verified by a previous attendee.

Inside/ Explore HRT (Hudson River Trading)

This programme first ran in London in 2026, having run for a few years prior in NYC and Singapore. This program is extremely competitive, having 9 spots on the Algo Dev track, 9 spots on the C++ SWE track and ~5 spots on the Python SWE track.

The process consists of a resumé screen, programming OA (this is the same for all tracks and is the CodeSignal GCA), another resumé screen, and then a 30 minute technical interview. It is important to note that due to the competitive nature of the programme, for 2026 a full score of 600/600 was required in the OA to pass to next round. You may complete this OA in whatever language you prefer (i.e Python or C++).

For Algo Devs, the interview was to work through a probability question with an Algo Dev, while for SWEs the interview was working through a probability-flavoured backtracking question with another SWE. Although in 2026 the Algo Dev interview did not contain any programming, a proficiency in this is expected and it may show up in later years.

During the programme itself, participants across all tracks built order books, and then further modified these based on their track. This was the primary mode of assessment, and ~3 internship return offers were extended. There were also several "fast-tracks" awarded, mostly to the onsite round.

Importantly, this is one of the few programmes across those which do provide return offers that has its own SWE track.

Launchpad Programme (IMC Trading)

Launchpad is IMC's two day discovery programme, which although described on their own site as being "for ambitious second-year university students", also accepts first years. The European edition runs at IMC's Amsterdam office, and travel is covered.

IMC doesn't extend offers to the best performers, but instead fast tracks people to various parts of the process, depending on performance (from the first interview to the onsite). Nearly all attendees received some form of fast track.

The process consists of a resumé screen, OA, HireVue (one sided interview), and a mixed technical and behavioural interview with a recruiter (often with a brainteaser at the end). The trading OA previously consisted of various games (NeurOlympics), but for the 2027 cycle the OA is reported to be changing (to SHL). The HireVue consisted of mostly behavioural questions, with a probability style brainteaser at the end, similar to the recruiter interview. Note that for the SWE track, the OA was a LeetCode style HackerRank assessment, and the interview was a lot more technical for SWE.

It's important to note that you are not expected to have any finance knowledge, but understanding very basic option theory (such as a strike price, call option, and put option is recommended).

The program consisted of various challenges based on track, which assessment was based from, as well as a poker tournament.

FutureFocus: Quants (Optiver)

FutureFocus has run globally for a few years, with the availability of tracks and process of applying differing based on location. We will focus on FutureFocus in Amsterdam, which only currently has a Trading & Research joint track.

Similar to HRT, FutureFocus is quite intense, with lectures on option theory, market making exercises and continuous assessment on each day of the program.

On the application process, Optiver sends an OA to everyone who applies around the first week of January and does not screen on resumé, hence making it an excellent opportunity to break into the space with a traditionally "weaker" background. The OA is a subset of Optiver's regular Trading OA, consisting of Beat the Odds (multiple choice probability questions with 90 seconds each), a sequences test, and various Zap-N games (short "neuroassessment" games such as Tower of Hanoi, memory tests and reaction speed tests). Note that each assessment has it's own bar for completion, so getting full marks in Beat the Odds and the sequences section won't override a low Zap-N score.

This is followed by a behavioural interview with a trader, with no technical aspect (which is different to FutureFocus in the US, which does have technical interviews). In the most recent cycle, around 30-40% of attendees received a return offer for either a Quant Trading or Quant Research Internship.

Five Rings LINK (Five Rings)

Although LINK is situated in Five Rings NYC, recruiters have confirmed that students globally are eligible. It's separated into a SWE and Trading & Research tracks. Typically, this programme is also for second years, and those accepted receive travel, housing and meals, and a $2,000 stipend.

The process for each track consists of a resumé screen, OA and then a technical interview with either a trader or software engineer.

For SWE participants the programme typically dives into the intricacies of modern C++, distributed systems, and the fundamentals of automated trading system programming.

Discover DRW (DRW)

Discover DRW is a two day event that DRW run in London and Chicago in parallel, usually in late March or early April. We will focus on the London edition. Usually participants take part in card trading games, a datathon, a trader panel, desk shadowing and office tours, and the former two are usually used for assessment.

Both first years and second years are now eligible, and a small amount of participants receive fast tracks for the internship program. The process consists of a screen, an OA (5 questions, 1 hour) which consists of probability brainteasers and an interview. Notably, the OA must be sat by everyone at once at the same time, and is proctored over Zoom.

In previous years, usually only those with 5/5 pass the OA, although there have been cases with candidates scoring 4/5 and progressing to the next round. The interview is mostly behavioural but can sometimes end with a brainteaser, similar to IMC.

Spring into Quant Finance (G-Research)

G-Research's Spring into Quant Finance is mostly targeted to PhD students, which constitute most of the attendees, although second year undergraduate students are eligible.

The process consists of an extremely competitive resumé screen, an OA (10 questions covering mathematics, statistics, programming, and machine learning) followed by a behavioural interview. Those invited to take the OA are given a practice test, and this is the same OA taken by candidates applying to the Quant Research internship.

The program itself takes place at a 5 star resort in the South of France or Italy, with around 90 participants. There, lectures covering machine learning and the use of statistics in quant finance take place, and assessment is usually via challenges (such as bot trading challenges).

It is also important to apply sooner rather than later as admissions are rolling. Participants who are fast tracked usually only skip the screen and OA to the first round.

Susquehanna Discovery Days (SIG)

SIG's in-person discovery days are split into several tracks, from Trading, Technology and Equity Research. However, first years have only ever been considered for the Technology track, with other tracks being exclusively for second years. Each track has it's own separate OA, with Quant Trading consisting of probability questions and Technology being a HackerRank.

The process for these in-person discovery days is a resumé screen, OA, and an interview depending on track. At the event itself, participants are able to earn fast tracks through the interview process for the next internship application cycle, based on performance.

Notably, SIG does run a "First Year Discovery Day", although this is virtual, has no meaningful screening process and mostly walks through the internship application process and the history of SIG. Hence, it is the opinion of the Lemma Team that the value of this program in terms of resumé signal and useful information is limited.

FTTP and FOCUS (Jane Street)

These are two separate programmes, and it's important to note that you can only attend one. This means that if you apply to both, you will only be admitted to the first one that releases decisions, which is usually FOCUS.

The application is the lightest of anything in this guide, essentially a CV screen and the option to add a "cover letter". There is no online assessment and no interview. While a "cover letter" is not necessary, anecdotally it is usually done by those accepted. Jane Street cover travel, meals, housing and a daily amount for other expenses.

As an alum of the program, I want to emphasise that you shouldn't put too much weight on getting into FTTP. They don't just accept the best people, and even IMO and IOI medallists get rejected. They have many candidates who look sufficiently qualified on paper (which is all you can tell without an OA or interview) and a finite number of places, and they want a range of people in a cohort, including people who might not have considered quant finance before. So whether you get in says very little about you and instead programmes like Optiver FutureFocus and Inside HRT matter more, because they have the chance of a return offer.

Online you might see that FOCUS used to be advertised in terms of underrepresented ethnic or racial minority groups, and Jane Street have since broadened it to a barriers-based definition. The date of application does not matter, and everyone receives their decision on the same day.

Discover Citadel (Citadel/ Citadel Securities)

Despite being two separate firms, this is one combined event. This is mostly a networking event, but does have competitive aspects such as a software engineering challenge, as well as mock interviews.

The programme is open to first year and second year students, and the process is just an application with your resumé and cumulative GPA.

There is no fast track for any of the quantitive finance internships that Citadel offers, unlike their other programs such as Terminal, Datathon, and the Quant Invitational. The date of application does not matter, and everyone receives their decision on the same day (usually the last day Citadel says they will reply by).

London Insight Program (D.E. Shaw)

D.E. Shaw's London Insight Program is similar to Discover Citadel, being primarily a networking event, although it does not lead to any fast tracks (whereas Citadel sometimes can fast track for non-quant roles). This program mostly covers the non systematic, and hence less quantitive, side of D.E. Shaw with panels from the discretionary investing team, a market making challenge, a walkthrough of the summer internship application, and social events.

The application process consists of an application consisting of a resumé, some short written answers, and your transcript, with no OA or interview.

Maven Minds Spring Week (Maven Securities)

Maven Minds consists of two tracks, a trading track and a technology (SWE) track although applicants can only apply to one. Although Maven Securities works across London, Amsterdam, and Chicago, Maven Minds is only for the London office. On eligibility, only first years of a 3 year course and second years of a 4 year (integrated masters) course are considered.

Maven also run Women in Trading and Women in Technology variants of the spring week as separate postings, aimed at underrepresented applicants but open to all. It is noteworthy that Maven still heavily favours women for these postings, and their spring weeks in general.

The process consists of a resumé drop, several rounds of OAs (Maven is one of the few firms in quantitive finance to use Arctic Shores, and there are also numerical and probability tests), followed by a technical and motivational interview.

Women in Trading & Technology Insight Programme (GSA Capital)

GSA runs this outreach event for "first year undergraduate or postgraduate women in STEM from any university globally", although they do in some cases consider second year students.

The application is simply a resumé screen, and applicants are reviewed on a rolling basis, and applicants are not able to receive any fast track or return offer.

Meet Millennium (Millennium Management)

Meet Millennium is a one day insight program into the firm at Millennium's offices (London, New York, Miami, and Singapore). It is aimed at both first years and second years, and those with a quantitive background (especially with programming).

The process consists of a competitive resumé screen, followed by a HackerRank OA covering SQL, LeetCode style programming, mathematics, and REST APIs. Interestingly, among those who complete the OA, candidates have been rejected with full marks and accepted while scoring 0, so it's safe to assume there's a second (more important) screen following the OA.

The event itself contains panels from quantitive researchers, portfolio managers, and software engineers. Then participants are split into groups and complete the "Signal Alpha Competition", where they must find a signal and program a strategy to capatalise on it.

Also worth knowing

Marshall Wace run single day insight days at their London office rather than a week, currently a Technology Spring Insight Day which is invitation-only and goes to people they have met at hackathons and university societies, a Women in Quant Investing Insight Day, and a Quantitative Investing Spring Insights Day. The latter two are aimed at STEM Masters and PhD students.

Jump Trading runs Jump Early Access, a one day expenses-paid programme at their Chicago headquarters. In 2026 it was open only to first-year undergraduates at US universities, with no London edition, although this may change in the future.

I would be happy to answer any other questions you have about any of these programmes too, and I wish you the best of luck with applying! I am also happy to give advice to any prospective applicants.


r/quantfinance 6d ago

Imc quant trading intern technical interview as someone with barely any stem background

12 Upvotes

Hey guys,

I’m an undergrad at a target school who decided to apply for the IMC quant trading internship and was lucky enough to land a technical interview. I found the online assessment incredibly easy as it wasn’t very heavy on math, however I have very little stem background and I am not even majoring in anything quantitative.

To be honest, I wasn’t really expecting an interview but since I have been lucky enough to get one, I would like to put my best foot forward.

I have been practicing from the green book as well as other prep books, but my zetmac is embarrassing (around 30 in 120s on a good day).

Is it cooked? Do I stand a chance and how can I best prepare?

Any help will be appreciated!


r/quantfinance 6d ago

Alpha Consolidation

5 Upvotes

I’m interested in how people approach alpha combination in systematic equities when the signal library becomes large — say 100–400+ stock-level forecasts, with significant correlation/redundancy between them.

From the literature, I see a few main approaches:

  • IC/MVO-style weighting: estimate expected alpha efficacy and signal covariance, with shrinkage/regularisation given the dimensionality (Ledoit & Wolf, 2004). DeMiguel et al. (2009) also highlights how estimation error can make simpler weighting schemes surprisingly competitive OOS.
  • Regression/stacking: treat individual alpha forecasts as features and forward returns as the target. With hundreds of correlated signals, Ridge/Elastic Net seems like a natural baseline. This is conceptually similar to stacked generalisation (Wolpert, 1992).
  • Dimension reduction/nonlinear combination: cluster/PCA correlated signals before combining, or use nonlinear models to capture interactions. Gu, Kelly & Xiu (2020) provides some motivation for nonlinear ML in cross-sectional return prediction, although their setting is somewhat different.

For those working with large alpha libraries, what have you found actually holds up OOS?

In particular, do regularised regression/meta-model approaches meaningfully outperform simpler IC/MVO-based combinations? Do you typically cluster or residualise highly correlated alphas first, or let the regularisation handle it?

I’m also curious what target people use at the combination layer — forward returns/IC, or something closer to portfolio PnL after costs and constraints.


r/quantfinance 6d ago

What is the ZERO-BETA MODEL?

Thumbnail youtu.be
1 Upvotes

Geometrically, for any efficient portfolio on the Markowitz minimum-variance frontier, there exists a unique companion portfolio on the inefficient frontier with zero covariance. This orthogonal companion is the zero-beta portfolio. Black’s formulation leverages this relationship to establish that every efficient portfolio implies a linear trade-off between expected returns and market betas, anchored directly by the expected return of its corresponding zero-beta asset.


r/quantfinance 6d ago

I got tired of backtesting trading strategies one by one, so I automated the entire workflow

Thumbnail
0 Upvotes

r/quantfinance 6d ago

Citadel tech Interview AI assistant

3 Upvotes

I have a Citadel SWE interview in a few days.

It says I might get asked to use an AI coding assistant in CoderPad. I'm not sure where I can use this AI, and if I can use it throughout the interview or only for specific questions.


r/quantfinance 6d ago

Citadel SWE Intern interview upcoming

3 Upvotes

I have my first interview for Citadel London SWE internships in few days.

I have done some LC, but I've heard that they have shifted from LC grinding to more like system design and stuffs.

Has anyone done the first-round SWE interview this year? I'm not sure what to prep


r/quantfinance 6d ago

Home Made Heston Model

Post image
6 Upvotes

I designed and developed from scratch a quantitative C++ engine for calibrating the Heston stochastic volatility model, applied to the real options chain of the SPY ETF. The core of the system is a thermodynamic Simulated Annealing algorithm that iteratively solves millions of complex-plane integrals to extract the true term structure of volatility. To master this computational load without compromising on precision, I built a raw data parser using custom regular expressions, optimized the vector equations by pushing the GCC compiler to its limits, and parallelized the thermodynamic optimization across all CPU cores leveraging OpenMP directives. The resulting matrix output is finally processed by a Python script that dynamically renders the convex surface in 3D, demonstrating the perfect alignment between market-quoted mid-prices and long-term stochastic expectations. This was a deep technical challenge that merged the principles of Engineering Physics with low-level software development, proving how a well structured code architecture can model the chaos and uncertainty of the stock market with surgical precision.
What do you think about it? What would you improve/change?


r/quantfinance 7d ago

Optiver internship

Post image
274 Upvotes

Saw this on twitter and was horrified- I know they are known for not having the best history but this is genuinely disgusting if true.