These are the corporate actions that change what your shares actually represent, rather than just their number or price.
Merger and amalgamation
Two or more companies combine. Shareholders of the company being absorbed receive shares in the surviving company, in a fixed swap ratio.
Company A merges into Company B. The approved swap ratio is 3:5 — three shares of B for every five shares of A held.
You hold 500 shares of A.
You receive 300 shares of B. Your shares of A are extinguished and removed from your demat account; shares of B are credited automatically.
You do nothing. The ratio is fixed in the scheme, which requires shareholder, creditor, stock exchange and National Company Law Tribunal approvals before it takes effect.
Where the ratio produces a fraction, the fractional entitlements are usually aggregated, sold in the market by a trustee, and the cash proceeds distributed proportionately.
Demerger
The opposite: one company separates a business into a new, separately listed company. Shareholders receive shares in the new entity in a stated ratio, while keeping their existing shares.
A conglomerate demerges its financial services arm. Ratio 1:1.
You hold 200 shares of the parent.
After the demerger you hold 200 shares of the parent (now representing a smaller business) plus 200 shares of the new listed company.
The parent's share price adjusts downward on the ex-date to reflect the business that has left it. The new company then lists separately, and its price is discovered through a special pre-open session much like an IPO listing.
Why companies demerge: separately listed businesses are easier to value; different businesses need different capital structures and management focus; and a conglomerate sometimes trades below the sum of its parts.
Name and symbol changes
A company renames itself. The trading symbol changes, and sometimes the ISIN does too.
Nothing happens to your ownership. Your holding simply appears under the new name after the change date.
Delisting
A company's shares are removed from the exchange and stop trading publicly.
Voluntary delisting — usually a promoter buying out public shareholders. SEBI's process includes a reverse book building mechanism where public shareholders bid the price at which they are willing to exit, subject to defined thresholds for success.
Compulsory delisting — the exchange removes a company for serious or persistent non-compliance. This is bad news for shareholders: the shares stop trading while the holding remains, and exit becomes extremely difficult.
Scheme of arrangement
The umbrella legal term covering mergers, demergers and similar restructurings. A scheme must pass through shareholder and creditor approvals, exchange and SEBI scrutiny, and NCLT sanction.
This is why these actions take many months from announcement to completion, and why the announcement date and the effective date can be far apart.
What you should actually do
For nearly all of these, the answer is nothing — shares are credited or debited automatically.
But three things are worth doing:
- Read the announcement, particularly the swap or entitlement ratio.
- Reset pending orders. A demerger changes the parent's price mechanically. Old GTTs and stop losses will misfire.
- Re-examine why you own it. A merger or demerger changes what the business is. The reason you bought may no longer apply to what you now hold.
Key takeaways
- In a merger your shares are swapped for the surviving company's shares at a fixed ratio, automatically.
- In a demerger you keep your existing shares and receive shares in the new company.
- New demerged shares may sit untradeable in your account for weeks until the separate listing happens.
- A name change does not affect ownership, but a cosmetic one is worth investigating.
- Delisting removes the shares from the exchange and makes exit very difficult — watch the exit window.
Check your understanding
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