Index entry, index exit, and delisting: why do they matter to investors?

An index is a group of securitiesA general term for a tradable financial asset (such as a share, bond, or unit in a fund) that represents a right to an asset or to profits. selected and managed according to fixed, predefined mathematical rules.

For example, the TA-35The flagship index of the Tel Aviv Stock Exchange, consisting of the 35 companies with the highest market capitalization traded in Israel. (ת״א־35) index contains the 35 largest public companies on the Tel Aviv Stock Exchange that meet its threshold conditions, including liquidityThe speed and ease with which money can be withdrawn from an investment and converted into cash in a bank account without significant penalties. and public-float requirements. You can think of the index as a digital shopping basket representing an important part of the Israeli economy. Instead of analyzing a single share, an index gives investors a quick view of the entire market or a particular sector, such as the TA-Banks or TA-Technology index.

Every index has clear rules that determine:

• Which companies may enter it.
• Which companies will leave at a periodic update.
• The weight—percentage—assigned to each share within the basket.

To understand why a share moves, you need to know the largest players in today’s capital markets: passive products such as ETFs, index funds, and index-tracking products.

Billions of shekels are managed by computers that do not try to predict which share will rise. Their sole purpose is to replicate the index’s composition precisely. If a particular share makes up 2% of the TA-125 index, a tracking fund must use investors’ money to hold that share at a weight of exactly 2%.

When the exchange announces an index update, the following occurs:

1. Entering an index: automatic, forced demand

When a new share enters an index, every tracking fund and ETFA security traded on an exchange that tracks a particular index, allowing an investor to buy a "basket" of assets in a single transaction. that follows the index must buy it on the update date in order to match the new composition. This can suddenly create demand worth millions of shekels. The demand does not arise because fund managers fell in love with the company or expect excellent financial results; they buy simply because the rules require it.

2. Leaving an index: technical selling pressure

The reverse mechanism operates with the same technical force. A company that leaves an index—because other companies grew past it or because it failed to meet the required trading volume—is automatically sold by passive funds. This forced selling creates heavy pressure, especially if the company is relatively small and its normal daily trading volume is low.

The trap: believing you are the first to know

Many amateur investors believe they have found an easy-money method: buy a share when its index entry is announced and sell it at a profit to the tracking funds on the update date.

In reality, the market is efficient and the rules are known in advance. Analysts and professional traders calculate expected changes many weeks before the official update. The share price therefore often begins to rise well before the actual entry date. Once the update arrives and the funds complete their automatic purchases, the “special demand” disappears and the share may fall. There is no free money in the market.

Not every company in an index receives the same weight. A company’s weight is usually based on market capitalization, but the Tel Aviv Stock Exchange, like major indices around the world, applies another important filter: public-float market value.

Suppose there are two large companies—Company A and Company B—each with a market capitalization of ₪10 billion.

• In Company A, the founder and other interested parties own 80% of the shares. Only 20%, worth ₪2 billion, is freely held by the public.
• Company B has no dominant controlling shareholder, and 80% of its shares, worth ₪8 billion, is held by the public.

In the exchange indices, Company B will receive a significantly larger weight than Company A because the index examines how much of the company is actually available for free and liquid public trading, rather than only the company’s theoretical value on paper.

When a share leaves an index, it remains on the exchange and continues trading independently outside the index baskets. Delisting is completely different: the share ceases to exist as an exchange-traded security.

The word “delisting” sounds frightening and may suggest bankruptcy, but it can result from two opposite scenarios:

1. Delisting after a positive event: tender offer or merger

A large company or private investment fund decides to acquire the company in full. It submits a full tender offer and offers shareholders a predetermined price—usually higher than the current market price—for their shares.

If the transaction is completed, you receive cash or shares in the acquiring company in your investment account. The old share is delisted simply because it is no longer needed. In this case, delisting is the result of a successful exit.

2. Delisting after a negative event: collapse or failure to meet requirements

The company encounters severe financial difficulties, its share price falls to fractions of an agora, and trading volume becomes negligible. The exchange suspends and later delists the share because it no longer meets the minimum requirements for orderly and fair public trading.

What happens if you are left holding a delisted share?

If a share is delisted because of collapse rather than an acquisition, your asset is not necessarily legally worth zero—you still own a proportional interestThe "price of money" – the amount paid for the use of someone else’s money, as income to the depositor or as a cost to the borrower. in the company. But there is a severe liquidity problem. Because the share no longer trades on a screen, there is no orderly trading system or order book in which you can click “Sell.” To realize the investment, you may need to find a private buyer, sign legal contracts outside the exchange in an over-the-counter transaction, and sometimes discover there is no realistic way to recover the money. Your share has become a locked asset without an exit.

1. Tel Aviv Stock Exchange — About the TA-35 index — The index conditions and update dates, including entry and exit rules.
2. Tel Aviv Stock Exchange — Determining a share’s index weight — A concise explanation of the relationship between public float and a share’s weight in the index.
3. Tel Aviv Stock Exchange — Delisting — Information on delisting securities and its relationship to trading suspensions and exchange rules.