YESBANK Premium Decay Analysis
HistoricalOption premium decay — watch theta eat the premium in real time
Intraday CE/PE premium-decay charts for NIFTY, BANKNIFTY, stocks and commodities, with seller-P&L and running-average views.
Most important nuance
A framework for studying CE and PE value loss while separating Theta from spot and IV effects: observed premium decay is not pure time decay unless the underlying and implied volatility are sufficiently stable.
What is premium decay?
An option’s premium erodes as expiry approaches even when the underlying stands still — that’s theta (time decay). This tool plots the erosion live for the strikes you choose.
Decay is not linear
Decay is mild early in the weekly cycle and accelerates near expiry; on expiry day an ATM option can lose 70–80% of its remaining value between 1:00 PM and 3:00 PM. Time-of-day matters more than day-of-week late in the week.
Buyer vs seller lens
Buyers fight theta; sellers collect it. Toggle Seller perspective in the chart to flip premium change into P&L from short options and see the zero line that separates winners from losers.
How to use this tool
Pick instrument + expiry, set call/put strike ranges, then replay the session: green CE and red PE areas show premium change, cyan lines track synthetic future and spot, dashed lines are running averages.
What This Page Gives You
Decay Analysis
Track premium decay patterns and theta impact.
Strike Range
Compare decay across multiple strike prices.
Strategy Tools
Advanced tools for premium decay analysis.
How to Read Premium Decay
What It Tracks
Track premiums across consistent timestamps.
Best Comparison
Separate intrinsic and extrinsic value.
Strongest Use
Compare CE and PE behavior around ATM.
Main Risk
Check IV and spot before attributing decay.
Functionality Available on This Page
Premium Timeline
Tracks aggregate or selected CE and PE premium behavior together with the underlying price.
Seller Insights
Ranks seller opportunities using premium change, OI, IV, volume, and strike context.
Buyer Insights
Surfaces call and put buyer setups plus IV-expansion opportunities.
Structure and Volatility Tabs
Adds market-structure, volatility, and ATM-skew observations.
Flow and Risk Tabs
Includes volume-flow analysis, significant OI changes, high-Gamma risk, and risk alerts.
Strike Detail Table
Shows strike, price change, percentage change, seller P&L, volume, OI change, IV, and Greeks.
Terminology Traders Actually Need
Observed Premium Decay Path Decomposition
Observed premium decay is the change in market premium through time, influenced by Theta, spot, IV, and trading flow.
Market Reading
Use the premium timeline with buyer, seller, volatility, and structure tabs to identify the dominant driver.
India Market Context
Indian weekly index options can lose extrinsic value rapidly during quiet expiry sessions.
Caveat
A falling premium is not pure Theta unless spot and IV effects are controlled.
Decay Efficiency Realized Erosion
Decay efficiency compares how much premium eroded relative to available extrinsic value and elapsed time.
Market Reading
Compare CE and PE at similar moneyness and avoid mixing liquid and stale strikes.
India Market Context
Intraday event risk can delay decay and then produce a sharp volatility crush.
Caveat
Execution spreads can exaggerate apparent decay in thin contracts.
Buyer-Seller Asymmetry Outcome Split
The buyer and seller views organize how premium retention or erosion differs across strikes and option sides.
Market Reading
Use the detail table to locate where decay is broad versus driven by one strike.
India Market Context
Directional moves can preserve one side’s premium while accelerating decay on the other.
Caveat
The labels describe premium behavior, not verified participant profitability.
How to Use This Page
Choose Comparable Strikes
Use the same expiry and similar moneyness for CE-PE decay comparisons.
Read the Premium Timeline
Identify when erosion accelerated, paused, or reversed.
Open the Diagnostic Tabs
Use seller, buyer, structure, volatility, flow, and risk views to explain the path.
Confirm in the Strike Table
Check premium, IV, OI, volume, and liquidity before attributing the move to Theta.
Frequently Asked Questions
What is premium decay in options?
Premium decay is the erosion of an option's extrinsic value as time passes toward expiry. Even when the underlying and implied volatility stand still, the premium keeps falling — that loss is theta, or time decay.
What time of day does NIFTY option premium decay fastest?
Theta decay accelerates in the final hours of the session. On expiry day an ATM NIFTY option can lose 70–80% of its remaining time value between 1:00 PM and 3:00 PM as settlement approaches, while decay early in the weekly cycle is comparatively mild.
Is premium decay good for option sellers or buyers?
Sellers collect theta, so decay works in their favour when spot and IV stay quiet. Buyers pay theta every session and need a spot or volatility move large enough to overcome the erosion before expiry.
How do you read the premium decay chart?
Pick an instrument and expiry, set the call and put strike ranges, then replay the session. Green CE and red PE areas show premium change, cyan lines track the synthetic future and spot, and dashed lines are running averages. Toggle the seller perspective to read the same move as P&L from short options.
Is every premium decline time decay?
No. Spot movement, IV compression, liquidity, and order flow can also reduce premium.
Why can premium rise despite negative Theta?
A favorable spot move or IV expansion can exceed the theoretical time-decay effect.
Why compare buyer and seller views?
They highlight whether erosion is broad and stable or offset by directional and volatility risk.
What makes decay analysis unreliable?
Stale prices, wide spreads, mismatched moneyness, different expiries, and event-driven IV shifts.
Option premium decay tracker
Premium Decay follows how option premiums erode through the session for the selected strikes — the theta experience made visible intraday rather than assumed from theory.
Decay speed diverges between quiet and trending days; replaying past sessions shows exactly how much premium survived into the final hours on each type of day.
Workflow: open the strike you intend to trade and watch decay speed per hour rather than absolute premium, compare against a replay of comparable past sessions, and time entries so theta works for you as seller or against you as buyer knowingly. The final two hours before expiry concentrate most of the decay the theory promised all week.
What is premium decay in options?
The erosion of option value as expiry approaches — theta at work. All else equal, an option loses time value each session, accelerating in the final days as the probability of the strike being reached collapses toward zero or certainty.
How fast do options lose value near expiry?
Non-linearly: an ATM option can lose half its remaining time value in the final one or two sessions, because each passing hour removes a large fraction of the remaining chance to move. This tracker shows that acceleration strike by strike rather than leaving it to theory.
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