Delisting
The removal of a security from the list of instruments traded on an exchange.
Delisting is the end of trading in a particular security on an organised market: the exchange removes it from the list of admitted instruments, and orders in it are no longer accepted. The security itself does not disappear and is not written down to zero; the only thing that changes is the place where a trade in it can be made.
Who removes a security, and on what grounds
The decision is taken by the exchange — either at the request of the issuer itself or on its own initiative, when the security no longer meets the requirements of the listing level it was on. Typical reasons on the issuer's side: consolidation of capital in the hands of a major holder, a reorganisation, a change of jurisdiction, a move away from public status and disclosure. Reasons on the exchange's side: the issuer no longer producing financial statements, liquidation, failure to meet obligations under the issue — for debt securities this merges with default. Moving a security from one listing level to another, or a temporary suspension of trading, is not a delisting: the security stays on the list of admitted instruments.
What the holder is left with after removal
The record of ownership is kept not at the exchange but in the record-keeping system: the depository goes on maintaining the account, a shareholder remains a shareholder, and the rights to vote and to share in the distribution of profit go nowhere. What is lost is the exchange mechanism that matches orders, and with it liquidity: a trade has to be sought on the over-the-counter market, where there may be no buyer at all. For the case where the issuer initiates the departure from the exchange, corporate law provides an exit mechanism — it is covered under the delisting buyout, structured as an offer addressed to shareholders by analogy with a tender offer.
Example: the price exists for as long as the admission exists
While a security is on the list, it has a continuously updated exchange quote built from real orders:
After delisting, this line simply stops updating. The valuation does not become an "old price" — it stops being a price, because the market that formed it has gone.
Where the term is misunderstood
The main mistake is to read a delisting as a verdict on the business. A company can leave the exchange at the peak of its operating results, and conversely, a bankrupt issuer sometimes stays on the list for a long time. Delisting is an infrastructure event, not a fundamental one, and in a classification of risks its place is next to infrastructure risk, not next to credit quality. The second error is to think that the stake in the capital has shrunk: the number of securities held does not change; what changes is the ability to turn them into money at an observable price.