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Build and Visualize Option Strategies
Updated 31 October 2026 · 5 min read · 14 Contents
Plain-language meaning
The Option Strategy Builder lets derivatives researchers assemble up to six NSE option and futures legs, then read the expiry payoff, a target-date (T+n) curve, per-leg and net Greeks, what-if scenarios and break-even points, all computed by the server from the persisted option chain.
Why it is useful #
It shows how a structure behaves before expiry as well as at it: net Delta, Gamma, Theta and Vega, how P&L moves with spot, implied volatility and time, and whether profit or loss is bounded. Thirteen ready-made templates (bull and bear spreads, straddles, strangles, iron condor, butterfly, call ratio spread, jade lizard and call calendar) fill the legs from the loaded chain, and signed-in members can save named structures (legs only, up to 50) and reload them with fresh chain prices.
Where it appears and the workflow #
Open Option Strategy Builder from /Options/StrategyBuilder or the link in the Option Chain workspace. Choose the symbol and expiry, apply a template or add CE, PE or FUT legs (buy or sell, strike for options, lots, optional entry price), move the days-forward control to see the T+n curve and its date, add up to five what-if scenarios (spot shift in % or points, IV shift in vol points, days forward) and read the scenario grid. Save, rename, reload or delete strategies from the saved list.
Calculation or source #
Option legs use Black-Scholes-Merton (European exercise, no dividend yield) with each leg's own NSE-published implied volatility and time = calendar days to the 15:30 IST expiry close ÷ 365. Theta here is the analytic per-calendar-day theta and Vega is per one volatility point; the Option Chain table keeps its one-day finite-difference theta, so the two theta figures can differ slightly. Futures legs are valued as spot plus the current basis shrinking linearly to zero at their expiry (Delta 1). P&L = Σ side × quantity × (value − entry price). Legs expiring after the earliest option expiry are valued there with Black-Scholes and their own IV.
Prerequisites, inputs, period and unit #
Inputs: the persisted chain's underlying value and as-of time, each leg's own IV, last price and published market lot, the persisted futures last price, and a risk-free rate (default 7%, configurable). Quantities are lots × the published market lot; when any leg's lot size is not published every figure switches to per unit of the underlying and is labelled "per unit — market lot unknown". Money in INR.
Worked example #
Illustrative only (synthetic numbers, not a quote): buying one 25,000 call at 180 and selling one 25,200 call at 95 on a 75-unit lot is a net debit of 85 × 75 = ₹6,375; maximum profit (200 − 85) × 75 = ₹8,625, maximum loss ₹6,375, break-even 25,085. With 13 days left the T+0 curve is smoother than the expiry kinks, net Theta is small and negative and net Vega small and positive.
What high and low mean #
A larger positive net Delta means more bullish exposure, a negative one bearish; a large negative Theta means the structure loses more value per day if nothing moves; a large Vega means its value depends heavily on implied volatility. A wide gap between the T+n and expiry curves shows how much time value is still at stake.
Positive, negative and zero #
Positive P&L is a gain, negative a loss and zero a break-even. Maximum profit or loss is shown as Unbounded when the payoff keeps rising or falling beyond the last strike; with legs in several expiries the maximum and break-evens are read from the displayed spot range and marked as such.
Limitations and common mistakes #
This is a model under stated assumptions, not a forecast: real option prices also move with bid/ask spreads and with changes in the volatility skew that a flat per-leg IV does not capture. No margin or SPAN requirement is estimated, and financing, brokerage, taxes and slippage are excluded. A target date past the earliest expiry is clamped to that expiry. Non-persisted expiries are read on demand and may be a few minutes apart from the persisted chain (flagged when more than 15 minutes).
Market-specific differences #
NSE index and single-stock options are European and cash-settled for indices, physically settled for stocks; lot sizes are revised by NSE and are always taken from the exchange-published contract rows, never assumed. Other venues differ in lot size, exercise style, settlement and taxes.
Suggested next steps #
Check the Option Chain workspace for bid-ask spreads and liquidity at every intended strike, compare the probability-of-profit estimate with the payoff, and re-run the analysis after the chain refreshes.
Educational use only #
This guide explains descriptive research evidence. It is not investment advice, a price prediction, a recommendation, a claim of predictive accuracy, or an instruction to buy, sell, rebalance or place an order.