Index Committee

Choosing which stocks belong in an index is not automatic. A stock can clear every eligibility rule and still not get in.

A specific body makes that final call. The workbook names it the Index Committee.

First, Index Construction Managers set eligibility rules. These rules are qualitative and quantitative. A stock that meets them becomes entitled to be considered for the index.

Being entitled is not the same as being included. The Index Committee generally takes the actual decision to add or remove a security.

The workbook's own words: "Stocks in the index are chosen based on certain pre-determined qualitative and quantitative parameters, laid down by the Index Construction Managers. Once a stock satisfies the eligibility criteria, it is entitled for inclusion in the index. Generally, the final decision of inclusion or removal of a security from the index is taken by a specialized committee known as the Index Committee."

Two steps sit behind an index's composition, and the Index Committee is the second of them:

1. Eligibility criteria set by Index Construction Managers. These are the pre-determined qualitative and quantitative parameters a stock must satisfy to be entitled for inclusion.
2. The Index Committee's final decision. Satisfying the eligibility criteria makes a stock entitled to be considered — the Index Committee is generally the body that actually decides inclusion or removal.

The workbook names the specialised agencies that carry out index construction, maintenance and revision for India's two major exchanges: BSE indices are managed by Asia Index Pvt Ltd, and NSE indices are managed by NSE Indices Limited. The Index Committee sits within this institutional structure as the decision-making body for composition changes, distinct from the day-to-day work of index construction, maintenance and revision.

A good index, the workbook notes, is a trade-off between diversification and liquidity — diversification benefits fall away sharply beyond a certain number of stocks (going from 10 to 20 stocks sharply reduces risk; from 50 to 100 gives very little further reduction; beyond 100, almost none). The Index Committee's inclusion and removal decisions are made against that backdrop, using the eligibility parameters the Index Construction Managers have laid down.

A real, numbered eligibility screen the workbook gives. As per SEBI Circular dated October 30, 2025, stock exchanges must follow these prudential norms before derivatives can be launched on an existing non-benchmark index: a minimum of 14 constituents, the top constituent's weight capped at 20%, the combined weight of the top 3 constituents capped at 45%, and a descending weight structure. The workbook gives this for two named non-benchmark indices — BANKEX (BSE) and FINNIFTY (NSE), implemented in a single tranche by 31 December 2025, and BANKNIFTY (NSE), phased in over four monthly tranches by 31 March 2026. This is exactly the kind of numeric eligibility screen an Index Committee applies when it reviews a security against the Index Construction Managers' quantitative parameters.

A candidate stock, Meridian Chemicals Ltd, has 5,00,00,000 shares outstanding and trades at Rs 120 a share. Its market capitalisation works out to 5,00,00,000 × Rs 120 = Rs 6,00,00,00,000, i.e. Rs 600 crore — the same market-capitalisation calculation the workbook uses earlier in this chapter.

Meridian comfortably clears the Index Construction Managers' quantitative screen on size, so it becomes entitled to be considered for a non-benchmark index under review. But the workbook's own SEBI Circular dated October 30, 2025 eligibility norms give the Index Committee three further, numbered tests before it can actually decide:

Meridian meets the size and constituent-count tests but fails the combined-top-3 cap — the exact kind of numeric conflict the Index Committee exists to resolve, not something the eligibility screen alone can settle. The Index Committee reviews the case and takes the final decision: here, that could mean deferring Meridian's inclusion, or phasing it in through tranches the way the workbook's own BANKNIFTY illustration adjusts an existing constituent's weight over four monthly steps, rather than including it in one move.

At the same time, an existing constituent whose free float has shrunk after a promoter buyback, or whose trading volumes have fallen well below the eligibility threshold, may be flagged for removal. Here too, meeting or failing the quantitative criteria feeds into the decision, but it is the Index Committee that takes the final call on whether and when the stock is actually dropped from the index.

Chapter 2 (Understanding the Index), section 2.5 (Index management), names the Index Committee as the body that generally takes the final inclusion/removal decision, immediately after describing how eligibility criteria are laid down by Index Construction Managers. Expect a definitional question on which body makes the final call on index composition changes, and a question naming the specialised agencies behind India's two major exchanges' indices (Asia Index Pvt Ltd for BSE, NSE Indices Limited for NSE).

• Meeting the eligibility criteria makes a stock entitled to inclusion; it does not mean automatic inclusion. The Index Committee still takes the final decision.
• Index Construction Managers set the criteria; the Index Committee applies them to specific inclusion/removal decisions. These are two different roles in the same process, easy to conflate.
• "Generally" is the workbook's own qualifier — the text does not claim the Index Committee is the decision-maker in every single case, only that this is the general arrangement.
• Do not confuse the Index Committee's composition decisions with index maintenance or index revision — those are the broader, ongoing processes (adjusting for corporate actions, and periodically refreshing the constituent list) within which the Index Committee's decisions operate.
• Asia Index Pvt Ltd manages BSE indices; NSE Indices Limited manages NSE indices — a direct recall pairing that is easy to swap.
• The 14-constituent minimum, the 20% top-weight cap and the 45% top-3 cap are from a specific SEBI circular (30 October 2025) about derivatives on existing non-benchmark indices — the workbook does not state that these exact numbers apply to every index's general construction; treat them as the named numeric example of an eligibility screen, not a universal rule for all indices.