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OA prep · by firm

Citadel Securities online assessment 2027

Provider: Correlation One

Providers change between cycles and firms rarely publish their tests, so everything here is what candidates report and what the provider documents, in that order of trust. Treat it as where to start, not a promise.

3 Citadel Securities openings live on the tracker

What the test is like

Citadel Securities Datathon

Built by Correlation One

Format
Not an aptitude test. Citadel Securities runs Datathons through Correlation One as a route into data and quant tracks: a qualifying quiz first, then teams work a large dataset and present findings to judges.
Timing
Citadel Securities publishes a 60 minute qualifying quiz. The team stage runs over the event itself, and no marking scheme is published for either part.
What is uncertain
This is the firm we could least verify. Figures circulating for a Citadel quant online assessment come from aggregator sites with no primary source behind them, so they are deliberately absent here.
How to practise
No drill here, and a Datathon is not a format you can drill anyway.

What students report this cycle

No debriefs about Citadel Securities's test yet this cycle. Students who track an application here can say what they sat afterwards; once a firm has three, the counts show here.

Other firms

The full OA prep guide: every provider, every drill, and the plan for the weeks before a test.