Spot Price Polling and Final Settlement Price of Futures
This sub‑topic explains how the spot price of a commodity is polled and how the final settlement price of a futures contract is derived. Understanding this process is essential for NISM Series XVI because the exam tests the candidate's ability to compute settlement values and to recognise regulatory requirements. Mastery helps you answer calculation‑based questions and avoid common pitfalls related to settlement terminology.
Learning Objectives
- 1Define spot price polling and final settlement price.
- 2Describe the polling mechanism prescribed by SEBI.
- 3Calculate the final settlement price using the polling formula.
- 4Identify differences between settlement methods and their exam relevance.
Spot Price Polling – Concept
Spot price polling is the process of capturing the prevailing market price of the underlying commodity during a predefined short window just before the expiry of a futures contract.
The purpose is to obtain a fair, market‑driven price that reflects the latest supply‑demand dynamics, rather than relying on a single end‑of‑day quote which could be distorted by low liquidity.
In the Indian commodity derivatives market, SEBI mandates that the polling window be the last 30 minutes of the trading day on the expiry date. The price is collected at regular intervals (typically every minute) from the exchange’s order‑matching system.
- Polling ensures transparency and reduces manipulation risk.
- The collected prices are later averaged to produce the final settlement price.
Many candidates treat the last traded price at market close as the settlement price. Remember, the final settlement price is the average of all spot prices observed during the polling window, not a single closing figure.
Mechanism of Spot Price Polling
On the expiry day, the exchange activates the polling module at the start of the 30‑minute window (e.g., 15:00 hrs for contracts expiring at 15:30 hrs). Every minute, the system records the best bid‑ask price or the last traded price, depending on the commodity’s liquidity.
All recorded observations are stored in a time‑series list. After the window closes, the exchange discards any outlier that deviates more than a pre‑specified percentage (usually 5 %) from the median, to guard against spikes.
The remaining observations are summed and divided by the count of valid observations. This arithmetic mean becomes the final settlement price. The calculation is performed automatically by the exchange and published on the SEBI‑approved website.
Final Settlement Price – Definition & Calculation
The final settlement price (FSP) is the price used to settle all open positions in a futures contract on its expiry date. It determines the cash flow for both long and short holders.
FSP is calculated as the simple arithmetic average of the valid spot‑price observations collected during the polling window. No weighting is applied; each observation carries equal importance.
For exam purposes, you must be able to compute FSP given a set of spot prices and the number of observations, and also understand how rounding rules (usually to two decimal places) are applied.
Where:
S_{i}= i-th valid spot price observed during the polling window (in rupees per unit)n= Number of valid spot‑price observations used in the averageWorked Example
Given 5 observations: 4000, 4010, 3995, 4005, 4002 rupees. Step 1: Sum = 4000 + 4010 + 3995 + 4005 + 4002 = 20012 Step 2: FSP = 20012 / 5 = 4002.4 rupees Verification: (\sum_{i=1}^{5} S_{i}) / 5 = 20012 / 5 = 4002.4.
Regulatory Framework (SEBI)
SEBI (Securities and Exchange Board of India) issued the "Regulations on Commodity Derivatives" which prescribe the polling window, observation frequency, and outlier removal criteria. The key points are:
1. Polling window: last 30 minutes of the trading session on the expiry date.
2. Observation frequency: at least once per minute; some exchanges use 30‑second intervals for high‑volume contracts.
3. Outlier filter: any price deviating more than 5 % from the median is excluded before averaging.
These rules are examined directly in the NISM test; candidates may be asked to identify the correct window or to explain why an outlier is removed.
Comparison of Settlement Methods
Key differences between major futures settlement methods in India
| Method | Basis of Settlement | Typical Use | Advantages | Disadvantages |
|---|---|---|---|---|
| Spot Price Polling | Average of spot prices during last 30 min | Most commodity futures (e.g., metals, agri) | Reflects real‑time market, reduces manipulation | Requires robust data collection; outlier handling needed |
| Index‑Based Cash Settlement | Pre‑published commodity index value | Broad‑based contracts (e.g., NIFTY‑COMMODITY) | Simpler calculation, transparent index | May lag actual market movements at expiry |
| Physical Delivery | Actual delivery of underlying commodity | Contracts where delivery is mandatory (e.g., certain agricultural grades) | Ensures price discovery through real trade | Logistics burden, storage costs, may affect liquidity |
Distribution of Settlement Methods for Indian Commodity Futures (2023)
Practical NISM‑style Scenario
Scenario
Rohit holds a long position of 10 contracts in Copper Futures (lot size = 1000 kg) that expire on 30 Sept. The exchange polls spot prices during the last 30 minutes and records five valid observations: 4000, 4010, 3995, 4005, 4002 rupees per metric ton. The contract's initial purchase price was 3950 rupees per metric ton.
Solution
Step 1: Compute the final settlement price (FSP) using the average formula. Sum = 4000 + 4010 + 3995 + 4005 + 4002 = 20012 rupees. FSP = 20012 / 5 = 4002.4 rupees per metric ton. Step 2: Determine price difference per metric ton = 4002.4 – 3950 = 52.4 rupees. Step 3: Calculate total profit = 52.4 rupees × 1000 kg × 10 contracts = 524,000 rupees. Step 4: Apply rounding as per exchange rules (usually to nearest rupee). The final profit is Rs 524,000. Verification: (4002.4 – 3950) × 1000 × 10 = 524,000.
Conclusion
Rohit earns a profit of Rs 524,000 because the final settlement price exceeded his entry price. The calculation demonstrates the direct link between spot price polling and cash settlement outcomes, a typical exam scenario.
If an observation is more than 5 % away from the median, SEBI requires it to be excluded. Forgetting this step leads to an incorrect final settlement price and loss of marks.
Memory Aids & Mnemonics
Use the mnemonic SPF‑30‑M‑5 to recall the key elements:
- S – Spot price polling
- P – Polling window (last 30 minutes)
- F – Final settlement price (average)
- 30 – 30‑minute duration
- M – Minute‑wise observations
- 5 – 5 % outlier threshold
When you see a question on settlement, run through SPF‑30‑M‑5 to ensure you include every required step.
Exam Tips & Common Questions
1. Direct calculation – Most NISM questions give you a set of spot prices; apply the average formula and round to two decimals.
2. Regulatory detail – Remember the 30‑minute window and the 5 % outlier rule; any answer that omits these is marked wrong.
3. Comparison questions – Be prepared to choose between spot‑price polling, index‑based cash settlement, and physical delivery. Focus on the basis of settlement and typical usage.
4. Trick question – Some items ask for the "closing price" of the futures contract. Distinguish it from the final settlement price; the former is used for mark‑to‑market, the latter for expiry settlement.
⭐Exam Takeaways
- Spot price polling captures market prices in the last 30 minutes of the expiry day.
- Final settlement price = arithmetic average of all valid spot‑price observations during the polling window.
- SEBI mandates a 5 % outlier filter; any price beyond this range is excluded before averaging.
- Settlement methods differ: polling (most common), index‑based cash, and physical delivery each have distinct bases and use‑cases.
- Remember the mnemonic SPF‑30‑M‑5 to avoid missing any component in calculations.
- When given a list of spot prices, always sum them, divide by the count of valid observations, and round to two decimal places.
- Distinguish between "closing price" (used for daily MTM) and "final settlement price" (used for expiry cash flow).
- Typical exam question: compute profit/loss using the final settlement price and contract specifications.
Practice Questions
8 questions on Spot Price Polling and Final Settlement Price of Futures
What is spot price polling in commodity futures?
According to SEBI, how long is the polling window for final settlement of a commodity futures contract?
Given the valid spot‑price observations 4100, 4120, 4090, 4115 and 4105 rupees, what is the final settlement price (rounded to two decimals)?
If the median of five spot observations is 4002 rupees, which of the following prices would be discarded as an outlier under SEBI's 5% rule?
A trader bought 5 copper futures contracts (lot size 1000 kg) at 3800 rupees/ton. The six recorded spot prices are 3800, 3820, 3840, 5000, 3810, 3830 rupees. After applying SEBI's outlier filter, what is the profit?
Which settlement method uses the average of spot prices observed during the last 30 minutes of the expiry day?
In the mnemonic SPF‑30‑M‑5, what does the ‘M’ represent?
What percentage deviation from the median triggers the outlier removal in SEBI's spot price polling process?