A bonus issue and a stock split can both increase the number of shares shown in an Indian demat account. The corporate action explains why the count changed. Buying more shares is a separate event with a separate cash payment.
SEBI's investor education material describes bonus issues and splits as different corporate actions. The examples below use fictional companies and simplified prices. They illustrate the arithmetic without predicting a price or describing tax treatment.
How a bonus ratio changes the share count
Suppose you hold 100 shares of Example Industries. The company announces a 1:1 bonus issue, meaning one additional share for each existing share covered by the announcement. Your eligible 100 shares produce 100 bonus shares, taking the total to 200.
The company does not collect another purchase payment from you for those bonus shares. Your cash invested in the original purchase remains the same. The action changes the number of shares over which your existing investment is recorded.
Assume the original purchase cost was ₹20,000. A simple portfolio tracking average changes from ₹200 per share to ₹100 per share when that unchanged amount is divided across 200 shares. This is a bookkeeping illustration. The tax cost assigned to original and bonus shares follows separate rules and cannot be inferred from that tracking average.
A 1:2 bonus ratio means one bonus share for every two existing shares. On 100 eligible shares, that creates 50 additional shares and a total of 150. Reading the words alongside the ratio prevents confusing additional shares with the final total.
How a split changes the units
Now use a different fictional holding of 100 shares with a market price of ₹200 each. A company splits each share with face value ₹10 into two shares with face value ₹5. The count becomes 200 shares.
Face value is the nominal amount attached to a share in the company's capital records. It is different from its market price. The change from face value ₹10 to ₹5 does not say that a market price of ₹200 becomes ₹5.
In a simplified adjustment with no other price movement, 200 shares at ₹100 have the same ₹20,000 market value as 100 shares at ₹200. Actual traded prices respond to orders and other information. The arithmetic describes the unit change, not a guaranteed opening price.
The event and the investment return are separate
An unchanged investment value divided into more units does not create an investment gain on its own. A tracker that changes the share count but retains the old per-share price can temporarily show an inflated value.
For example, multiplying 200 post-split shares by the old ₹200 price reports ₹40,000. That combines a new share count with an old unit price. The discrepancy disappears only when both quantities refer to the same basis.
The same caution applies to price charts. A historical series adjusted for a split and an unadjusted purchase price are different inputs. An apparent fall in price requires the corporate action record before it can be interpreted as a loss.
Records that explain the change
A useful event record contains the company, security identifier, action type, ratio, record date, credited quantity and the supporting announcement. The announcement and the eventual demat credit document different stages of the same event.
Keep the original purchase information alongside the action. Replacing the old trade with a fictional new purchase would introduce a cash payment that never happened. A note identifying the event explains why a current share count differs from the original contract note.
FinTarget's portfolio documentation explains holdings and its stock split control. A split entry changes the recorded share count and average cost. FinTarget does not automatically process every bonus issue, and a tracking adjustment is not a tax calculation. The issuer announcement and depository statement remain the records for the event itself.