NISM Series XVI – Commodity Derivatives: Chapter 4 – Commodity Indices and Index Futures (Short Notes)

This is Part 4 of 7 in our complete NISM Series XVI Commodity Derivatives short notes series. In this chapter, we cover everything about commodity indices in India — how they differ from equity indices, how they are constructed, SEBI guidelines, major indices like AGRIDEX, iCOMDEX, and BULLDEX, and the uses of commodity index futures.

Missed earlier parts? Start with Part 1: Introduction to Commodity Markets.

1. What Are Commodity Indices?

A commodity index is a benchmark that measures the performance of a basket of commodities. However, commodity indices in India differ importantly from equity indices:

Equity indices (like Nifty 50 or BSE Sensex) are constructed from the spot prices (current market prices) of their constituent stocks.
Commodity indices in India are constructed from the futures prices of commodities, not spot prices.

This is because commodity futures prices are generally higher than spot prices due to the cost-of-carry relationship (storage, insurance, financing costs). Using futures prices makes the index more relevant to actual market participants who trade futures contracts.

Key Regulatory Background: SEBI's circular dated 18 June 2019 provided explicit guidelines on the construction methodology for robust commodity indices based on futures contract prices.

2. Major Commodity Indices in India A. Composite Indices (Multiple Commodity Segments)

Index Name	Exchange	Covers
NCDEX AGRIDEX	NCDEX	Agricultural commodities whose futures are listed on NCDEX
MCX iCOMDEX	MCX	Non-agricultural commodities (energy, industrial metals, precious metals) whose futures are listed on MCX

B. Sectoral Index (Single Segment)

Index Name	Exchange	Covers
MCX BULLDEX	MCX	Precious metals segment only (Gold, Silver)

3. Key Rules for Index Construction and Constituents

SEBI has laid down specific rules for how commodity indices are to be built and maintained. The following points are frequently tested in the NISM XVI exam:

Once an index is constructed with fixed weights for each commodity futures, those weights can remain unchanged for up to one year. Index weights and constituents must be rebalanced at least once a year.
Each constituent commodity futures contract must have been in existence for at least 12 months and must have traded on at least 90% of the trading days during those 12 months.
For a Composite Index, a minimum of 80% of the index weight must come from commodity futures whose Minimum Average Daily Trading Volume (ADTV) is:
- At least ₹75 crore for agri-based commodities
- At least ₹500 crore for non-agri (energy, metals) commodities
Commodity indices are price-based indices, not volume-based.
The weights of commodities in the index are determined by the exchanges, based on a scoring system that considers production value and liquidity value.
Index value is disclosed based on the traded price in the constituent's immediate expiry contract (the nearest active futures contract).
Around expiry dates, roll-over of index components to the next month's futures contract is required. This is a known limitation of commodity indices built on futures prices.
Indices are calculated on a real-time basis using traded prices of constituent futures contracts.

4. Trading in Index Futures

A commodity index changes in value as the prices of its constituent commodity futures change. Since the index value fluctuates, it creates the opportunity for derivatives trading — specifically, futures contracts on commodity indices.

Index futures allow participants to take positions on the overall movement of a commodity segment (e.g., agricultural commodities or metals) without needing to trade each constituent commodity individually.

5. Uses of Commodity Index Futures

A commodity index represents the overall market level for a particular group of commodities — similar to how Nifty or Sensex represents the equity market. This makes index futures useful for several purposes:

A. Hedging

An index can be used for hedging based on general market sentiment. For example, a participant with exposure across multiple agricultural commodities can hedge using AGRIDEX futures rather than taking separate hedges in each commodity.

B. "Proxy Monsoon" Derivative

NCDEX AGRIDEX can serve as a proxy for monsoon-related risk to some extent, as agricultural commodity prices are heavily influenced by monsoon performance in India. (Note: The correlation is not perfect.)

C. Excess Return Index Strategy

A wholesaler dealing in multiple grains or agricultural products may buy in the physical spot market and simultaneously sell (short) index futures to profit from the spread between physical and futures prices.

D. Institutional Players

Mutual funds, Portfolio Management Services (PMS), and other institutional investors are permitted to take exposure to the commodity segment through schemes that use commodity index derivatives.

E. Exchange Traded Funds (ETFs)

An ETF is a packaged portfolio listed on the exchange, where the ETF's price moves in tandem with the Net Asset Value (NAV) of the underlying scheme. Commodity index ETFs allow investors to gain broad commodity exposure through a single listed instrument.

F. Diversified Portfolio Management

An index represents a hypothetical diversified portfolio of commodities. Therefore, a price disruption in one or two specific commodity futures does not significantly impact a trader or hedger using index futures for their strategies. This diversification benefit is a key advantage of index futures.

6. Why Commodity Indices Are Different from Equity Indices — Summary

Feature	Commodity Index (India)	Equity Index
Based On	Futures prices of commodities	Spot prices (current market prices) of stocks
Roll-Over Needed?	Yes — near-month futures must be rolled over to next month near expiry	No — stocks are continuously traded
Price vs Spot	Generally higher than spot prices due to cost of carry	Index reflects actual current market prices
Seasonal Impact	Significant — agricultural commodities have seasonal price cycles	Not applicable in the same way
SEBI Regulation	Guidelines issued via SEBI circular (June 2019)	Governed by stock exchange index provider regulations

Quick Revision – Key Exam Points for Chapter 4

Commodity indices in India use futures prices, not spot prices.
SEBI issued commodity index construction guidelines via a circular dated 18 June 2019.
Index weights must be rebalanced at least once a year.
A constituent commodity futures must have been in existence for 12 months and traded on 90% of trading days.
NCDEX AGRIDEX = Agricultural commodities index.
MCX iCOMDEX = Non-agricultural commodities (energy + metals).
MCX BULLDEX = Precious metals only.
Minimum ADTV for agri index constituents = ₹75 crore; for non-agri = ₹500 crore.
Indices are calculated on a real-time basis.

Practice Questions (NISM XVI Pattern)

How are commodity indices in India different from equity indices in terms of construction?
Answer: Commodity indices use futures prices, not spot prices, due to cost-of-carry pricing. Equity indices use spot (current market) prices.
Which SEBI circular provided guidelines on commodity index construction methodology?
Answer: SEBI circular dated 18 June 2019.
What is the minimum ADTV requirement for a non-agri commodity to be included in a composite commodity index?
Answer: ₹500 crore
How often must commodity index weights be rebalanced?
Answer: At least once every year
Which index is considered a proxy for monsoon-related risk in India?
Answer: NCDEX AGRIDEX
Which commodity index covers only the precious metals segment?
Answer: MCX BULLDEX
Why is roll-over of index components necessary for commodity indices?
Answer: Because commodity indices are based on futures contracts, and futures contracts expire each month. Near expiry, the component must be rolled over to the next month's futures contract to maintain continuity.

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