The International Swaps and Derivatives Association (ISDA) standard initial margin mode (SIMM) is a risk sensitivity-based approach to calculate initial margin (IM) for uncleared derivatives ISDA providing model parameters to calibrate for each product class on historical data considering a period of relevant financial stress. Over-the-counter (OTC) derivatives are categorized into one and only one of the following four Product Classes: RatesFX, Credit, Equity, and Commodity. Under ISDA SIMM, initial margin is calculated using sensitives as inputs. This includes Delta and Vega such that the initial margin would cover 99% confidence given a 10-day margin period of risk. For each product class covered ISDA specifies which sensitivities are required. For Equity, Commodities & FX spot prices are bumped 1% to calculate deltas, and volatility is shifted 1% to calculate vegas. For Interest Rates, curves are bumped at 12 points to calculate deltas.