Interview practice
Citadel Securities-style number sequences practice
A market maker quoting across equities, options, fixed income and ETFs globally.
What this assessment looks like
A pattern-recognition screen: a list of numbers hiding a rule - arithmetic, geometric, alternating, second-order differences, or interleaved sequences - and you supply the next term before the clock runs out.
- First and second differences, ratios, and alternating patterns
- Interleaved sequences (two rules taking turns)
- Squares, cubes, primes and factorials recognised on sight
- Committing to an answer with seconds left
Train it here
- Sequence Sprint - Timed next-term sequences, exactly the assessment format.
- Arithmetic Drill - The raw calculation speed that sequence tests assume you already have.
Also reported at Citadel Securities
80-in-8 mental math · Probability & estimation · Market making · Quant developer coding · Stochastic processes
Outcry is not affiliated with Citadel Securities and has no access to their assessment content. This page describes formats candidates publicly report, and the drills here train the underlying skills - they are not the firm’s questions.