Delisting of Shares: Reverse Book Building Explained
Delisting means a company’s shares stop trading on the stock exchange. It happens voluntarily, when promoters buy out public shareholders to take the company private, or compulsorily, when an exchange removes a company for breaking listing rules.
Voluntary delisting in India runs under the SEBI (Delisting of Equity Shares) Regulations, 2021. In most cases the exit price is set by a reverse book building auction, where public shareholders bid the price at which they are willing to sell, and the offer only succeeds if the acquirer’s holding reaches 90% of total issued shares.
If you hold a stock that has announced delisting, the decision you face is narrow but consequential: tender or sit tight. Understanding the mechanics tells you which one makes sense.
Voluntary Delisting vs Compulsory Delisting
| Point | Voluntary delisting | Compulsory delisting |
|---|---|---|
| Who starts it | Promoter or acquirer | The stock exchange |
| Why | Take the company private, cut compliance cost, restructure | Persistent non-compliance with listing rules |
| Price discovery | Reverse book building, or a fixed price route where permitted | Fair value fixed by an independent valuer |
| Shareholder vote | Special resolution by postal ballot | Not applicable |
| Consequence for promoters | None, subject to compliance | Debarment from the securities market for up to 10 years |
| Coming back | Relisting allowed after a cooling period of 5 years | Effectively shut out |
Compulsory delisting is a penalty, and the promoters still have to buy out public shareholders at the valuer’s price. Voluntary delisting is a corporate decision, and that is the process retail investors actually have to engage with.
How Reverse Book Building Works
A normal book build discovers the price at which investors will buy. Reverse book building discovers the price at which existing shareholders will sell. The steps run roughly in this order.
- The acquirer makes an initial public announcement of the intention to delist.
- The board considers it, and shareholders vote by postal ballot. The special resolution passes only if the votes cast by public shareholders in favour are at least twice the votes against.
- The company seeks in principle approval from the stock exchange.
- A floor price is computed using the pricing rules under Regulation 8 of the SEBI Takeover Regulations, which look at historical traded prices. The acquirer may also announce a voluntary indicative price above the floor.
- A detailed public announcement and a letter of offer go out, with money placed in escrow.
- The bidding window opens on the exchange platform for at least five working days. You tender shares through your broker at or above the floor price.
The 90% threshold
The discovered price is the price at which the acquirer’s post offer shareholding, including the shares validly tendered at or below that price, reaches 90% of the total issued shares. If bids never take the acquirer to 90%, the offer fails, the shares stay listed and everything is returned.
Reaching 90% is not enough by itself. The acquirer still has to accept the discovered price. If public shareholders collectively hold out for a very high price, the acquirer can simply walk away.
If the acquirer says no
The 2021 regulations added a counter offer route. Where the discovered price is unacceptable but a large share of the public holding has been tendered, the acquirer may make a counter offer at a price it names, which cannot be below the book value of the company. Shareholders then decide on that number. The specific tendering thresholds for a counter offer sit in the regulations, so read the letter of offer rather than relying on a summary.
The Fixed Price Route
SEBI has added a fixed price alternative for companies whose shares are frequently traded. Instead of an auction, the acquirer announces one price that has to carry a minimum premium (15% in the framework as notified) over the floor price, and shareholders simply accept or refuse. The 90% success condition still applies.
This route removes the tail risk of a runaway discovered price, which had made several delisting attempts collapse. Because this part of the framework has been amended more than once, confirm the current requirement in the latest SEBI notification before you assume a specific premium applies.
What a Public Shareholder Should Weigh
Once delisting succeeds, your shares are no longer tradable on NSE or BSE. You are not wiped out, but liquidity effectively disappears.
- Shareholders who did not tender get an exit window of at least one year after delisting, during which they can sell to the acquirer at the same exit price.
- After that window, selling means finding a private buyer off market. Price discovery is gone.
- The stock often trades above the floor price during the offer, because the market is pricing the probability of a higher discovered price. That premium vanishes if the offer fails.
- Tendering is done through your broker in a special acquisition window, and there is a deadline. Missing it is a real risk for investors who ignore corporate action emails.
One common misconception is worth correcting: delisting is not the same as a company shutting down, and it is not the same as a suspension for non-compliance. A profitable, cash rich company can delist precisely because its promoters think the market is undervaluing it.
Frequently Asked Questions
What happens to my shares if I do nothing during a delisting offer?
They remain in your demat account as shares of an unlisted company. You can still sell them to the acquirer during the exit window of at least one year at the exit price, after which your only option is a private off market sale.
Can the exit price be lower than the current market price?
The floor price is calculated from historical prices, so in a stock that has run up sharply the floor can sit well below the screen price. The discovered price in a reverse book build is usually higher than the floor, but nothing guarantees it will beat the last traded price.
Do I pay capital gains tax when I tender in a delisting offer?
Yes, tendering is a sale and the gain is taxable. Because the transaction happens through the exchange acquisition window, the usual listed equity holding period rules apply, so check the treatment for your holding period under the Income Tax Act with your tax adviser.
Can a delisted company come back to the exchange?
A voluntarily delisted company can apply for relisting only after a cooling off period of five years from delisting, and it has to meet the listing requirements afresh. Companies removed compulsorily face far harsher consequences.
Is delisting from one exchange the same as going private?
No. If a company delists from a regional exchange while staying listed on NSE or BSE, shareholders keep a trading venue and no exit offer is required. The full reverse book building process applies only when the shares will no longer be listed anywhere with nationwide terminals.
Key Takeaways
- Voluntary delisting is governed by the SEBI Delisting Regulations, 2021, and needs a shareholder special resolution.
- Reverse book building lets public shareholders bid the exit price above a floor price set by takeover pricing rules.
- The offer succeeds only if the acquirer reaches 90% of total issued shares and accepts the discovered price.
- A fixed price route with a minimum premium over the floor price is available for frequently traded shares.
- If you do not tender, you keep an exit window of at least a year, then liquidity largely disappears.
