How it unfolds, step by step
The setup
An investor holds 10 shares quoted at ₹1,000. The market value is ₹10,000. In a two-for-one split each old share becomes two new ones, so the holding is 20 shares. If the price adjusts mechanically to ₹500 and nothing else changes, the holding is still worth ₹10,000.
What happens next
A one-for-one bonus produces the same new share count from the same starting point. Ten shares become twenty, under the declared terms of a different kind of action. In both cases the units multiply. In neither case do the extra units by themselves create value. They do not double the company's assets, and they do not change the share of it that the holder owns.
What it means — and does not
A cash dividend moves value in a way the other two do not. Take 100 shares with ₹5 declared per share. The gross amount is ₹500 for an eligible holding, before whatever withholding and tax treatment apply to the facts. That cash leaves the company. This is why a price-only chart can miss part of the outcome. It is also why a total-return view has to count payouts alongside market value. The legal and accounting treatment of a split and a bonus differ too, and the cost allocation for tax can differ with them. That is why a purchase-average calculator should not quietly record either one as an ordinary buy at zero price.
What this does not establish
The arithmetic above assumes a mechanical adjustment and nothing else happening. That assumption is the first thing to go. Actual trading prices move for every other reason too, so the opening price after an action is not predicted by the ratio. The reading also fails whenever a series is adjusted on one side only. Adjusting prices without adjusting the matching quantities distorts a portfolio calculation. And reading a or low off unadjusted data reports a level that was never a level. Dates carry different meanings as well. Announcement, ex-date, record date and payment or credit date answer different questions. The ex-date is the first day the share trades without the entitlement. Entitlement follows the issuer's declared terms together with the settlement convention in force. It does not follow a weekday remembered from a previous event. This page states none of those rules or dates for any action. They live in the exchange's corporate-action filings, which are its record of splits, bonuses and dividends, and in the issuer's own announcement. A generic calendar is a route to that filing rather than a substitute for it.
Things to check
7Does the change in the holding match the ratio announced, and the date it applies from?
Has the price scale been adjusted on the same basis as the quantity, or only one of the two?
Which date is being used — announcement, ex-date, record date or credit date?
Does the return being measured include payouts, or only the change in price?
Are the original transactions still on record, rather than overwritten to make a chart look smooth?
Is the action a split or a bonus? The share count can match while the treatment does not.
Read the issuer's terms and dates. A larger share count alone does not increase the value held.
Common mistakes
5Reading a move from ₹1,000 to about ₹500 on the day of a two-for-one split as a 50% loss.
Treating a bonus issue and a split as the same event because the resulting share count is the same.
Recording bonus shares in a purchase-average calculator as an ordinary purchase at zero price.
Judging a distributing holding from its price chart alone, so the cash paid out never enters the result.
Inferring entitlement from a generic calendar instead of the issuer's own terms for that action.
- The holding lost half its value that day
- The number of units and the price scale, with the value unchanged in this example
- The company's assets were divided in two, which is the reason the quoted price came down to half of what it was
Show the answer
B. The number of units and the price scale, with the value unchanged in this example
A split changes the denomination of the shares, not the business behind them. The first answer is what an unadjusted price chart invites. The drop is the scale changing, not value leaving. Actual prices can still move for every other reason on the day. That is why the example says 'in this example' rather than predicting an opening price.
Frequently asked
3Does doubling my share count double my wealth?
Not by itself. Twenty shares at ₹500 is the same ₹10,000 as ten at ₹1,000. What the company is worth has not changed because the units it is divided into have.
Are bonus shares and stock splits the same thing?
No, even when a simple example produces the same new share count. The legal and accounting treatment differs, and so can the cost allocation for tax.
Can I judge a dividend-paying holding from its price chart?
Not on its own. Cash paid out leaves the company, and the price can adjust around the event. So a price-only view omits part of what the holder received.