Vega Analysis — Intraday Call & Put Vega Across ATM Strikes for NSE F&O
Nifty 50 (NIFTY) Vega Analysis: Live and Historical Modes
Live mode
Live mode streams the current NIFTY session and refreshes the Call and Put Vega lines as new prices arrive, so you can watch volatility exposure build and unwind in real time around the ATM window you chose.
Historical replay
Switch to Historical mode and pick any past trading day to replay that day's intraday Nifty 50 option prices and rebuild the vega lines exactly as they appeared. This is the practical way to study how volatility exposure reacted around results, policy events, or expiry on NIFTY.
Putting it to work
Compare a calm Nifty 50 session against a volatile one in historical mode to learn the normal range of the call/put vega gap. As of 1 June 2026, that baseline makes it far easier to recognise when today's live reading is unusual and worth acting on.
Nifty 50 (NIFTY) Vega: Why Calls and Puts Diverge
Shouldn't a call and put have the same vega?
In the textbook Black-Scholes model, a call and a put at the same strike and the same implied volatility have identical vega. In the live NIFTY market they do not, because the call and put at a strike trade at different implied volatilities — the volatility skew. Vega is derived from each option's own market price, so the call-side and put-side vega lines for Nifty 50 separate exactly to the degree the skew is present.
What a widening gap tells you on NIFTY
When put vega pulls away from call vega, demand for downside protection is bidding up put implied volatility — a defensive, risk-off tone. When call vega leads, upside-volatility demand is dominating, which can accompany momentum or short-covering. Tracking the gap intraday on Nifty 50 gives an early, price-independent read on positioning.
Combining vega with skew tools
Pair Vega Analysis with the Volatility Skew and IV Chart views for NIFTY. Skew shows the IV shape across strikes at a moment; Vega Analysis shows how the aggregate call/put volatility exposure built up and unwound through the session. Together they explain both the level and the time dynamics of Nifty 50 volatility.
About Vega Analysis
Vega Analysis plots two intraday lines — total Call Vega and total Put Vega — for a band of strikes around the money. For every minute of the session it solves implied volatility from each option's traded price, reads that option's vega, then sums the vega of all selected calls into one line and all selected puts into another. The result is a clear picture of how your volatility exposure across near-ATM strikes evolved through the day.
In the textbook model a call and a put at the same strike share the same vega. In the live market they do not, because each trades at its own implied volatility — the skew. Splitting Call Vega from Put Vega makes that divergence visible: a put-vega line riding above call-vega signals downside-fear skew, while call-vega leading points to upside-volatility demand. The gap is a price-independent read on positioning that you can watch shift in real time.
Choosing the strike window
ATM is taken from the live option chain and the "Strikes around ATM (±)" control builds a symmetric window around it. Because both the call and the put are pulled for every strike, the window is capped at ATM ± 4 (eighteen legs) to stay within the intraday price feed's 20-leg limit. Vega is concentrated near the money, so this band captures the bulk of the exposure.
Pair Vega Analysis with our Volatility Skew, IV Chart, and Multi-Strike Chart for richer NSE volatility analysis.
Frequently Asked Questions
What does the Vega Analysis tool show?
It plots two intraday lines — total Call Vega and total Put Vega — for a band of strikes around ATM. For every minute of the session it solves implied volatility from each option's traded price, reads the option's vega, then sums the vega of all selected calls into one line and all selected puts into another. The result is how your volatility exposure across near-ATM strikes evolved through the day.
Why are Call Vega and Put Vega plotted separately?
In the Black-Scholes model vega is the same for a call and a put at the same strike and IV. In the real market, however, the call and put at a strike trade at different implied volatilities (the skew), so their vegas diverge. Splitting the two lines lets you see whether call-side or put-side volatility exposure is dominating, and how that balance shifts intraday.
How is the ATM strike chosen?
ATM is taken from the live option chain: the tool reads the spot/future level and snaps to the nearest available strike. The 'Strikes around ATM (±)' selector then builds a symmetric window around that ATM strike — for example ATM ± 3 covers seven strikes, each with its call and put.
Why is the strike range capped at ATM ± 4?
The intraday price API returns at most 20 option legs in one request. Because the tool fetches both the call and the put for every strike, ATM ± 4 is nine strikes × 2 = 18 legs, which is the largest symmetric window that stays within the limit.
Is vega here per share or per lot?
Vega is reported per unit of the underlying, per one percentage-point change in implied volatility — the standard Black-Scholes convention. Multiply by the contract lot size if you need the rupee vega of a full position.
Can I see how vega behaved on a past session?
Yes. Switch to Historical mode and pick a trading day. The tool replays that day's intraday option prices and rebuilds the Call and Put Vega lines exactly as they would have appeared live — useful for studying how volatility exposure reacted around events or expiry.
How to use Vega Analysis
- Pick the underlying — Choose Nifty, BankNifty, or any F&O stock from the symbol selector.
- Choose live or historical — Live streams the current session. Historical lets you replay a past trading day.
- Select the expiry — Pick the expiry whose strikes you want to analyse.
- Set the ATM range — Choose how many strikes around ATM to include (ATM ± 1 up to ATM ± 4). Both call and put are included for each strike.
- Read the two vega lines — Watch total Call Vega vs total Put Vega through the day. A widening gap signals call/put volatility-exposure imbalance driven by skew.