I saw a familiar type of riddle on Twitter that was directed at fundamental PMs. I gave a lazy answer and later improved it with a better answer after my half-assed-ness gnawed enough at me. I’ll reprint the riddle and the better answer here but spelling out the steps in greater detail than I did on twitter. Question: Estimate the price of a $180 call (20% OTM) on a $150 stock with 50% volatility, 3 months to expiry 150 Call Calculation (The ATM option) We start by estimating the at-the-money (ATM) call value using: ATM straddle = .8 * stock price * implied vol * √(Time to expiry in years) ATM Call = .4 * stock pric