The stock market fluctuates daily. Someday it rises high and someday reaches rock bottom. There are several stock indexes across the globe i.e. S&P 500, Dow Jones, Nikkei 225, Sensex, Nifty, etc.
These indexes are the statistical weighted average of few major companies listed under them. Sensex is calculated based on 30 companies and Nifty on 50 companies. It will be easier to understand with an example.
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Assume the calculation for an Index called ABC ( I will take very small fictional numbers so that there is no confusion)
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ABC takes into consideration 3 companies ( just for simple calculation). These companies are available for trading. FREE-FLOAT MARKET CAPITALISATION METHOD IS USED TO CALCULATE INDEX. It is simply multiplying the number of shares available to public with the current market price of the share.
Eg: XYZ company with 2000 shares, out of which only 1500 shares available for public trade at market price Rs. 120/- per share
=1500*120= Rs.180,000 Free Float Market capitalisation
MNO company with 3000 shares, out of which only 2000 shares available for public trade at market price Rs. 500/- per share
=2000*500= Rs.1000,000 Free Float Market capitalisation
PQR company with 1000 shares, out of which only 800 shares available for public trade at market price Rs. 200/- per share
=800*200= Rs.160,000 Free Float Market capitalisation
So, total Free Float Market Capitalisation = 180,000+1000,000+160,000=1,340,000
Now, the year ABC INDEX had begun or the BASE YEAR it would have the initial Market Cap value like the one we calculated now. (eg: Sensex’s base year is 1978-79)
So now we take 2 assumptions about base year and its Market Cap
- Base year: 2000-01
- 2. Market Cap: Rs.200,000
The base year Market Cap is considered 100. So daily or within every few minutes how much the Market Cap has increased or decreased to that base year is calculated
Calculation of ABC INDEX: 1,340,000* 100/200,000= 670 points
Tomorrow if the share prices of companies change and the Free Float Market Cap changes from Rs.1,340,000 to Rs.1,335,000 then how the changes are shown?
Calculation: 1,335,000* 100/200,000= 667.5 points
The Stock Market Index has gone down from 670 points to 667.5 points, i.e. the market is down by 2.5 points
Percentage Decrease = 2.5/670*100 = 0.37%
So, that’s how you get the news: The Market Today is at 667.5 points, down by 2.5 points or 0.37%.
Please do give me your feedback about the article and if you have any more doubts you want to be clear on. Thankyou.
DVP
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