Put-Call Parity Quant Interview Guide
Put-call parity quant interview guide for synthetic positions, no-arbitrage, dividends, rates, exercise assumptions, examples, and mistakes.
Candidates preparing for derivatives pricing and arbitrage prompts.
Put-call parity links calls, puts, stock, and cash
Put-call parity is a no-arbitrage relationship between a call, a put, the underlying, and a cash or bond position under stated assumptions.
Synthetic positions are the intuition
A call plus cash can replicate a put plus stock in the standard European setup. If two portfolios have the same payoff, their prices should align after funding and dividends.
Concrete example
If one side of the parity is too cheap relative to the other, a trader may describe buying the cheap synthetic payoff and selling the expensive one, subject to real-world frictions.
Assumptions matter
Exercise style, dividends, rates, borrow costs, transaction costs, and settlement details can change the clean formula. State the simplified setup before applying parity.
Common mistakes
Candidates often memorize the formula and forget the replication story. Interviewers usually care that you can reason through the payoffs and assumptions.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.