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Concepts

What is a stock split? Calculate shares, price and ownership

A stock split divides each existing share into several shares. In a 4-for-1 split, one old share becomes four new shares. The count changes, but the division itself adds no value. In a simplified example, price is divided by the same factor that multiplies share count. All amounts below are in Swedish kronor, labelled SEK.

What you will learn

  • Interpret a 4-for-1 split as four new shares for each old share.
  • Check both holding value and ownership fraction before and after.
  • Separate the split's change of units from a later market-price movement.

The same ownership is divided into more units

Imagine a fictional company with 10,000 shares, of which you own 25. Your fraction is 25 ÷ 10,000 = 0.25 percent. A 4-for-1 split gives the company 40,000 shares and you 100. The fraction is now 100 ÷ 40,000, still 0.25 percent.

A useful analogy is exchanging one part for four smaller parts of the same whole. Always check what the company's split terms mean and when the change occurs. Our example assumes whole shares, no fees and no other corporate event taking place at the same time.

Four times as many shares at one quarter of the price

Before the split, the invented price is SEK 240. For the pure division, we use SEK 60 afterwards because 240 ÷ 4 = 60. Both the company's total market value and your holding value are the same on each side of the table.

Checking 25 × 240 = 100 × 60 shows why more shares do not automatically mean a gain. The number is larger, but each unit represents a smaller part. Read the share count together with the price and the definition of the shares.

If the table does not fit, scroll it sideways.

Fictional 4-for-1 split without another price change
MeasureBeforeAfter
Company shares10,00040,000
Your shares25100
Price per shareSEK 240SEK 60
Your holdingSEK 6,000SEK 6,000
Your ownership0.25 %0.25 %

Separate the split from the next price change

If the price later becomes SEK 63, your 100 shares are worth SEK 6,300. Compared with the SEK 6,000 value after the division, that is a 5 percent increase. The increase comes from SEK 60 becoming SEK 63, not from 25 shares becoming 100.

Compare values on the same basis. Comparing SEK 240 before the split directly with SEK 63 afterwards without adjusting the share count gives a misleading percentage change. When reading a chart, also check whether older prices have been adjusted for the split.

A lower unit price does not make the company cheaper

In the table, the whole company's market cap is SEK 2.4 million both before and after. The same business is divided into more shares. The split alone therefore does not show that the business is worth more or that its market valuation is lower.

Write a short exercise note: count before, split ratio, count after and comparable value. If using an actual data source, read how it handles corporate events. This lesson does not promise automatic split handling in Investiq; the complete check works on paper with our fictional numbers.

  • Multiply both your count and the company's count by the same factor.
  • Divide the comparison price by that factor in the pure split example.
  • Check that share count times price gives the same value.
  • Evaluate later price movements separately.

Try it yourself

You have 12 shares at SEK 150 each. A pure 3-for-1 split occurs. How many shares do you have, what comparison price do you use and what is the holding worth?

Show the solution and explanation

36 shares at SEK 50 each, worth SEK 1,800 together.

12 × 3 = 36 and 150 ÷ 3 = 50. Both 12 × 150 and 36 × 50 give 1,800. The exercise assumes that nothing else affects value.

Check your understanding

Does your ownership grow just because your share count rises in a split?

No. When the company's total count rises in the same proportion, your ownership fraction stays unchanged.

Is the real price fixed after a split?

No. The proportional price is a comparison in our example. The market price can subsequently change for other reasons.

Practise with virtual money

Try what you just learned in a practice portfolio with virtual money. You don't deposit any real money.

How the practice portfolio works

More lessons on this topic

Sources and examples

The sources support the factual explanations. Calculations and exercises were created for this lesson. Amounts and price changes are invented unless stated otherwise.

This material is educational and does not recommend securities to buy. A simulated result does not guarantee a future result.

Practice now. Invest later.

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