Mastering Total Open Interest (TOI) in Options Trading

Published on: July 22, 2025

Trading in the stock market isn’t just about watching charts and waiting for signals. It is also about understanding what is happening behind the scenes, an Open Interest.

Options trading has been everyone’s favourite and they have started paying attention to a new tool called Total Open Interest (TOI). When used correctly, it can provide a clearer understanding of market trends, enabling traders to make right trading decisions.

What is Total Open Interest?

Total Open Interest is not just the sum of open interest across various options. It is a more advanced number that combines multiple factors, giving a deeper view of market activity. Think of it as an MRI scan of the market, revealing what is happening beneath the surface. Instead of just summing up open positions, it analyse how open interest changes at each strike price, resulting in a single, clear line. This line helps traders see if the market is strong or weakening, even before the price moves.

Key Characteristics of Total Open Interest

• Real-time tracking: It keeps updating minute by minute, giving up-to-the-minute insights.
• Multiple strikes in one view: Instead of viewing each strike separately, it blends the data into one neat graph.
• Not an indicator, but a study: It is more like a deep analysis tool than a simple indicator. Use it to understand market trends, not as a yes/no signal.

Expert Insights

Many traders say that total open interest acts like a “market MRI.” It helps detect hidden trends, such as when institutional traders are building or unwinding positions. This deeper perspective can alert you long before the obvious price movements.

How to Construct and Plot Total Open Interest

1. Selecting the Underlying and Expiry

Start by choosing your assets, for example, Nifty, Bank Nifty, or individual stocks. Index options often have high liquidity in weekly options (Nifty), making analysis easier. For monthly options, focus on liquid options for better accuracy.

• Choosing Strike Prices

Picks strike prices close to the current market price, referred to as At-The-Money (ATM). Daily, adjust these strikes depending on how far the market moves. If Nifty moves 100 points, update your strikes by a similar amount. For indexes, select 4-6 strikes around the ATM. For stocks, stick to 1-2 strikes to avoid unreliable data that comes from low liquidity.

• Tips for Accurate Plotting
• Rebuild the total open interest chart daily.
• Handle stocks with less liquidity carefully; fewer strikes are better.
• Use the closest expiry, whether weekly or monthly, based on liquidity.
• Visual Representation

Once you have prepared the data, put it on a chart showing:

• A color-filled area chart for the index or stock price.
• A dark blue or cyan line for total open interest.
• Red and orange lines representing short-term EMAs like 10EMA, 20EMA, or 30EMA (customizable). These EMAs serve as trend indicators, indicating whether open interest is increasing or decreasing.

Interpreting Total Open Interest for Trading Decisions

1. Trend Identification

Watch where the total open interest line sits relative to the EMAs. When it is above, it often signals an uptrend. If it drops below, it may indicate a downtrend.

• Signal Types and Their Meaning
• Trend continuation: Total open interest above EMAs indicates the trend is likely to keep going.
• Reversal signals: When the line crosses below the EMAs, it may suggest the trend is changing.
• Divergences: For stocks like HDFC Bank, if the stock price moves one way but total open interest shows another, it is a warning sign.
• Actionable Tips

Using total open interest, along with price action, gives you a strong edge. Do not rely on it alone. Combine the signals with charts, volume, or other indicators for a clearer picture. For example, if the market is rising but total open interest is falling, be cautious; a trend may be coming to an end.

Using Total Open Interest to Manage Trades

1. Entry and Exit Strategies
2. Wait for signals where total open interest crosses EMAs before entering trades.
3. Adjust strike prices as the market moves; don’t hold onto a strike that’s no longer relevant.
4. Use the signals to plan when to exit. For instance, when the total open interest line drops below the EMAs, it might be time to exit long positions.
5. Hedging and Risk Management
6. Use divergence signals to avoid false moves.
7. When the index is trending but individual stocks aren’t confirming, hold back or hedge your positions.
8. Lighten exposure when signals are weak or inconsistent.

Practical Examples

Say Nifty was 24,850 in Oct 2024, and your total open interest line crosses below the EMAs. This could be a sign to avoid going long. On stocks like Reliance, HDFC Bank or ICICI Bank, the same method helps confirm whether the trend is strong or weakening. If Reliance chart shows decreasing total open interest while prices fall, it’s better to stay cautious.

The Nifty fell from 24,600+ to 24,100 in two trading sessions, while the TOI was sloping downwards. As the TOI turned to the north, shorting the Nifty was a riskier trade.

Traders should select the current ATM (based on spot price) to track the moment of the underlying asset.

Here is an example of SBI Jan 2025.

On a positional basis, 15-minute charts are recommended while intraday traders can analyse 5-minute charts.

Historical TOI

You can analyse the Historical TOI to check on how the index or stocks have performed.

Limitations and Precautions

• Illiquid stocks can give false signals due to low data.
• Sudden, unexpected market moves might overshadow signals from total open interest.
• Do not treat total open interest as a crystal ball; it’s a guiding tool, not a prediction device.
• Always confirm with other indicators like price action, volume, or chart patterns.

Where can you find TOI?

 If you are an options trader, you might have understood the power of Total Open Interest (TOI).  You can easily access TOI for Free on the OPSTRA Mobile App and Zone Trading App.  

Download the OPSTRA Mobile App from here. {Iphone} {Android} 

Download the Zone Trading App from here. {Iphone} {Android} 

Here is the user interface of the Opstra Mobile App.

With its powerful TOI feature, Opstra helps you track market-wide position build-ups and unwindings with precision, enabling smarter, data-backed decisions. Traders looking for the TOI feature should definitely explore Opstra from Definedge, your gateway to smarter options trading.