The Jane Street Super Day Morning interview is stage 5 of 6 in the Jane Street interview process, after the Phone Round 3. Format: Onsite - 2-3 live mock-trading games. The day opens with two or three live market-making games, the real gate: you quote a two-sided market on an uncertain value, the interviewer trades against you, and you update quotes and manage inventory as order flow arrives.
Preparing for this round? Practice the 26 questions mapped to the Jane Street Super Day Morning, with worked solutions. A free account saves your progress.
What the Super Day Morning tests
They watch number sense, pricing under uncertainty and handling being picked off. Lunch follows; a weak morning usually ends the day.
QuantVault maps 26 practice problems to this round. By topic, the biggest groups are game theory (16), optimization (3), expectation (2), market microstructure (2); by difficulty, 2 easy, 8 medium and 16 hard. 12 of them were reported by candidates who interviewed at Jane Street, most recently in Feb 2026.
- The final day is a full day of interviews, in the office or on video, with quantitative traders.
- Market-making games and probability questions feature, along with a conversation about your general interests.
Who takes this round: Quant Trader candidates. See the full Jane Street process and who takes each round.
How to prepare for the Super Day Morning
- Quote tight but protect yourself - widen when you are unsure, and skew your market as inventory builds.
- Think in expected value out loud; they care about your reasoning and adjustment, not a single 'right' price.
- Practice the mock-trading game in Market Games before the day.
Further reading: How quant superdays work · Market-making game interview guide · Behavioral questions at trading firms.
Question types in this round
The 5 largest question types in the Jane Street Super Day Morning practice set; across them the most common sub-topics are expected value, convex optimization, conditional probability, adverse selection, Bayes' theorem, portfolio theory. The questions themselves, with worked solutions, are in the round practice.
Game Theory16 in this round
Optimization3 in this round
Expectation2 in this round
Market Microstructure2 in this round
Options Pricing2 in this round
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Frequently asked questions
What is the Jane Street Super Day Morning interview?
It is stage 5 of 6 in the Jane Street interview process, after the Phone Round 3. Format: Onsite - 2-3 live mock-trading games. The day opens with two or three live market-making games, the real gate: you quote a two-sided market on an uncertain value, the interviewer trades against you, and you update quotes and manage inventory as order flow arrives. They watch number sense, pricing under uncertainty and handling being picked off.
What questions come up in the Jane Street Super Day Morning interview?
The practice set QuantVault maps to this round centers on game theory, optimization, expectation.
How should I prepare for the Jane Street Super Day Morning interview?
Quote tight but protect yourself - widen when you are unsure, and skew your market as inventory builds. Think in expected value out loud; they care about your reasoning and adjustment, not a single 'right' price.
What comes after the Super Day Morning?
The Super Day Afternoon (stage 6 of 6). Format: Onsite - coding + data-science rounds (if you advance).
Practice the Jane Street Super Day Morning round
Work the 26 mapped practice problems with progress tracking, then move to the next stage of the Jane Street funnel.