Equity Research interview preparation
Sell side and buy side. Every question is either traced to a named firm from a public candidate report, or tagged at desk level when we could not trace it. Answers lead with the point, then the mechanism, then the limitation.
100 questions, mapped to the firms that asked them
- Questions
- 100
- Traced to a firm
- 72
- Firms
- 45
- Updated
- September 2026
090How did you arrive at the assumptions in your case study?D.E. ShawGeneralist · New York · 2025Houlihan LokeyInvestment Banking · Richmond · 2025
Say this
Each assumption should trace to something external: a historical rate, a disclosed contract, an industry data point, a peer's experience. Name the source for each, and say which ones you are least confident about.
Then walk it
- Go through them in order of importance to the answer, not in model order. The interviewer cares about the two that drive the result.
- For each, give the anchor: 'I used 6 percent price growth because that is what they have taken in each of the last four years and the contracts reprice annually to an index.'
- Where you had no data, say so explicitly and explain the logic you substituted. Inventing a source is fatal; reasoning openly from a gap is respected.
- Distinguish the assumptions that matter from the ones that do not. 'The tax rate assumption is immaterial; the retention assumption drives 70 percent of the value' shows you understand your own model.
- Present the sensitivity around the critical ones rather than defending a point estimate. The honest position is a range with a most likely case.
- And volunteer your least confident assumption before they find it. Doing so converts a vulnerability into evidence of self-awareness.
Where candidates lose it
Defending every assumption equally, or saying 'that is what management guided'. Guidance is an input to be tested, not a source of truth. Trace assumptions to independent evidence wherever possible.
Expect next
- Which assumption are you least confident about?
- What if that assumption is 20 percent wrong?
- Where did you disagree with management's guidance?
Reported by candidates at D.E. Shaw (Generalist, New York, 2025); Houlihan Lokey (Investment Banking, Richmond, 2025). Source: Wall Street Oasis.
Firm tags come from public, anonymous candidate reports on Wall Street Oasis: strong signal, not sworn testimony. Firms are named as the places a question was reported, not as partners of Fin Maverick. Answers are written for this page to show how to think out loud; they are not scripts to recite.

