The PEAK6 First Interview is stage 2 of 4 in the PEAK6 interview process, after the Online Assessment. Format: 1 hr - Zoom, with a trader (per PEAK6). PEAK6 lists a one-hour Zoom interview with a trader.
Preparing for this round? Practice the 1 questions mapped to the PEAK6 First Interview, with worked solutions. A free account saves your progress.
What the First Interview tests
Candidates describe a behavioral half (why trading, why PEAK6, what is happening in markets) and a technical half: mental math, probability, expected value, brainteasers, estimation such as sizing a market or setting odds. One report: about 30 mental math problems in four minutes. Practise: mental math, Fermi estimation, expected value.
QuantVault maps 1 practice problem to this round. By topic, the biggest groups are brain teasers (1); by difficulty, 0 easy, 1 medium and 0 hard. 1 of them were reported by candidates who interviewed at PEAK6, most recently in Sep 2026.
- About an hour, usually two 30-minute halves with traders: one behavioural, one technical with expected value, bet sizing and estimation.
- The mental maths sprint (about 30 questions in 4 minutes) is usually read aloud. Practise with someone reading questions to you.
How to prepare for the First Interview
- Have a sharp why-trading story. Tie it to options and to PEAK6's teaching-heavy programs.
- Follow the markets. Expect a question on recent market moves or an asset class you care about.
- Estimate with structure. Break market-sizing questions into a few numbers you can defend.
Further reading: Behavioral questions at trading firms · Mental math for trading interviews · Fermi estimation questions · How quant superdays work · Market-making game interview guide.
Question types in this round
The 1 largest question types in the PEAK6 First Interview practice set. The questions themselves, with worked solutions, are in the round practice.
Brain Teasers1 in this round
Common mistakes
- Answer out loud. Traders want to hear the estimate, the check and the correction, not silent working.
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Frequently asked questions
What is the PEAK6 First Interview?
It is stage 2 of 4 in the PEAK6 interview process, after the Online Assessment. Format: 1 hr - Zoom, with a trader (per PEAK6). PEAK6 lists a one-hour Zoom interview with a trader. Candidates describe a behavioral half (why trading, why PEAK6, what is happening in markets) and a technical half: mental math, probability, expected value, brainteasers, estimation such as sizing a market or setting odds.
How long is the PEAK6 First Interview?
Candidates report: 1 hr - Zoom, with a trader (per PEAK6).
What questions come up in the PEAK6 First Interview?
The practice set QuantVault maps to this round centers on brain teasers.
How should I prepare for the PEAK6 First Interview?
Have a sharp why-trading story. Tie it to options and to PEAK6's teaching-heavy programs. Follow the markets. Expect a question on recent market moves or an asset class you care about.
What comes after the First Interview?
The Final Round (stage 3 of 4). Format: Half day - Zoom (per PEAK6); older reports describe an in-person Chicago superday.
Practice the PEAK6 First Interview round
Work the 1 mapped practice problems with progress tracking, then move to the next stage of the PEAK6 funnel.