The TRIN, or Trading Index, also known as the Arms Index after its creator, Richard Arms, in 1967, is a technical analysis indicator used by traders and investors to gauge overall market sentiment. By comparing the number of advancing and declining stocks to the volume of those stocks, the TRIN provides insights into the strength or weakness of the market. This short guide aims to shed light on how TRIN works and its significance in trading.
The TRIN Index is designed to measure the relative strength of the volume associated with advancing stocks vs. that of declining stocks. If more volume goes into advancing stocks than declining stocks, the Arms’ Index will fall to a low level under 1.00. Alternatively, if more volume flows into declining stocks than advancing stocks, the Arms Index will rise to a high level of over 1.00.
TRIN for NYSE

How TRIN Works
The TRIN is calculated using the following formula:

The numerator of this formula focuses on the number of stocks advancing versus declining, while the denominator looks at the volume of stocks advancing versus declining. The index is typically used to identify overbought or oversold conditions in the market.
Nifty TRIN Charts with 10 SMA

Reading the TRIN Values
TRIN Value < 1: This suggests bullish market sentiment. A value below 1 indicates that the volume of advancing stocks is greater than the volume of declining stocks. It’s often interpreted as a sign that the market strength is with the advancing stocks, potentially indicating a good buying opportunity.
TRIN Value > 1: This indicates bearish market sentiment. A value above 1 suggests that the volume of declining stocks outweighs the volume of advancing stocks, signaling that the market might be heading for a downturn or that it might be a good time to sell.
TRIN Value = 1: This is considered a neutral market, where the volume of advancing and declining stocks is balanced.
The TRIN is a contrarian indicator, meaning it seeks to determine how bearish or bullish market participants are and to predict potential reversals based on extreme sentiment. Extremely high or low TRIN values can indicate overbought or oversold markets, suggesting potential reversal points.
Like any indicator, it’s most effective when used in conjunction with other technical analysis tools and a comprehensive understanding of market context.
Where can I track TRIN & NH NL of NSE concomitantly ?