Best of the Week
Most Popular
1. US Housing Market Real Estate Crash The Next Shoe To Drop – Part II - Chris_Vermeulen
2.The Coronavirus Greatest Economic Depression in History? - Nadeem_Walayat
3.US Real Estate Housing Market Crash Is The Next Shoe To Drop - Chris_Vermeulen
4.Coronavirus Stock Market Trend Implications and AI Mega-trend Stocks Buying Levels - Nadeem_Walayat
5. Are Coronavirus Death Statistics Exaggerated? Worse than Seasonal Flu or Not?- Nadeem_Walayat
6.Coronavirus Stock Market Trend Implications, Global Recession and AI Stocks Buying Levels - Nadeem_Walayat
7.US Fourth Turning Accelerating Towards Debt Climax - James_Quinn
8.Dow Stock Market Trend Analysis and Forecast - Nadeem_Walayat
9.Britain's FAKE Coronavirus Death Statistics Exposed - Nadeem_Walayat
10.Commodity Markets Crash Catastrophe Charts - Rambus_Chartology
Last 7 days
Fasten Your Seatbelts Stock Market Make Or Break – Big Trends Ahead - 17th Sep 20
Peak Financialism And Post-Capitalist Economics - 17th Sep 20
Challenges of Working from Home - 17th Sep 20
Sheffield Heading for Coronavirus Lockdown as Covid Deaths Pass 432 - 17th Sep 20
What Does this Valuable Gold Miners Indicator Say Now? - 16th Sep 20
President Trump and Crimes Against Humanity - 16th Sep 20
Slow Economic Recovery from CoronaVirus Unlikely to Impede Strong Demand for Metals - 16th Sep 20
Why the Knives Are Out for Trump’s Fed Critic Judy Shelton - 16th Sep 20
Operation Moonshot: Get Ready for Millions of New COVAIDS Positives in the UK! - 16th Sep 20
Stock Market Approaching Correction Objective - 15th Sep 20
Look at This Big Reminder of Dot.com Stock Market Mania - 15th Sep 20
Three Key Principles for Successful Disruption Investors - 15th Sep 20
Billionaire Hedge Fund Manager Warns of 10% Inflation - 15th Sep 20
Gold Price Reaches $2,000 Amid Dollar Depreciation - 15th Sep 20
GLD, IAU Big Gold ETF Buying MIA - 14th Sep 20
Why Bill Gates Is Betting Millions on Synthetic Biology - 14th Sep 20
Stock Market SPY Expectations For The Rest Of September - 14th Sep 20
Gold Price Gann Angle Update - 14th Sep 20
Stock Market Recovery from the Sharp Correction Goes On - 14th Sep 20
Is this the End of Capitalism? - 13th Sep 20
The Silver Big Prize - 13th Sep 20
U.S. Shares Plunged. Is Gold Next? - 13th Sep 20
Why Are 7,500 Oil Barrels Floating on this London Lake? - 13th Sep 20
Sheffield 432 Covid-19 Deaths, Last City Centre Shop Before Next Lockdown - 13th Sep 20
Biden or Trump Will Keep The Money Spigots Open - 13th Sep 20
Gold And Silver Up, Down, Sideways, Up - 13th Sep 20
Does the Stock Market Really "See" the Future? - 12th Sept 20
Basel III and Gold, Silver and Platinum - 12th Sept 20
Tech Stocks FANG Index Nearing Critical Support – Could Breakout At Any Moment - 12th Sept 20
The Tech Stocks Quantum AI EXPLOSION is Coming! - 12th Sept 20
AMD Zen 3 Ryzen 4000 Questions Answered on Cores, Prices, Benchmarks and Threadripper Launch - 12th Sept 20
The Inflation Mega-trend is Going Hyper! - 11th Sep 20
Gold / Silver Ratio: Slowly I Toined… - 11th Sep 20
Stock Market Correction or Reversal? The Jury Isn't Out! - 11th Sep 20
Crude Oil – The Bearish Outlook Remains - 11th Sep 20
Crude Oil Breaks Lower – Sparking Fears Of Another Sub $30 Price Collapse - 11th Sep 20
Inflation by Fiat - 10th Sep 20
Unemployment Rate Drops. Will It Drag Gold Down? - 10th Sep 20
How Does The Global Economy Recover After This Global Pandemic? - 10th Sep 20
The Best Mobile Casino - 10th Sep 20
QE4EVER! - 9th Sep 20
AMD Ryzen Zen 3 4800x 10 Core 5ghz CPU, Cinebench Benchmark Scores (Est.) - 9th Sep 20
Stock Traders’ Dreams Come True – Big Technical Price Swings Pending on SP500 - 9th Sep 20
Should You Be Concerned About The Stock Market Big Downside Rotation? - 9th Sep 20
Options Traders Keep "Opting" for Even Higher Stock Market Prices - 8th Sep 20
Gold Stocks in Correction Mode - 8th Sep 20
The law of long-term time preference and Gold ownership - 8th Sep 20
Gold Bull Markets: History and Prospects Ahead - 8th Sep 20
Sheffield City Centre Coronavirus Shopping Opera Ahead of Second Covid-19 Peak - 8th Sep 20
Gold Price Trend Forecast Analysis - Part1 - 7th Sep 20
Bitcoin Price Crash - You Will be Suprised What Happens Next - 7th Sep 20
From Trump’s TikTok Mess to US Tech Cold War against China - 7th Sep 20
The Federal Reserve vs. Judy Shelton And Gold - 7th Sep 20
Fed Dials Up Inflation Target…Own Gold - 7th Sep 20
Does Gold Still Have Plenty of Potential? - 7th Sep 20
CDC Shock Admission - THERE IS NO PANDEMIC! Over 90% of Deaths NOT From COVID19 - 7th Sep 20
Stock Market SPX to Gold/Silver Ratios Explored – What To Expect Next - 7th Sep 20
Is the Precious Metals Market really Overwhelmed and Chaotic - 7th Sep 20

Market Oracle FREE Newsletter

How to Get Rich Investing in Stocks by Riding the Electron Wave

What is a Stock Market Index?

Stock-Markets / Stock Markets 2015 Apr 24, 2015 - 11:59 AM GMT

By: Boris_Dzhingarov

Stock-Markets For many people – entering the stock market and truly understanding the investment options available can be confusing.  Today we will speak about stock market indexes and why these are important and how they work.

The most simple explanation is this: an index is literally made up of several stock prices into a single number.  An Index can be made up based on markets or industries – and as the Options Industry Council (OIC) says, “Some are broad-based and measure moves in broad, diverse markets. Others are narrow-based and measure more specific industry sectors of the marketplace.”


The OIC also councils that is not always the number of stocks that comprise “…the average that determine if an index is broad-based or narrow-based, but rather the diversity of the underlying securities and their market coverage.”

There are a few types of Indexes ranging from Capitalization-Weighted which is term applying to that the stock prices making up the index is weighted toward larger companies.  The OIC will help with the math here”  “In calculating the index value, the market price of each component security is multiplied by the number of shares outstanding.”

Another type of index is called the Equal Dollar Weighted which is comprised of an equal number of shares from each stock.  The OIC says that the Equal Dollar …” is calculated by establishing an aggregate market value for every component security of the index and then determining the number of shares of each security by dividing this aggregate market value by the current market price of the security.”

The OIC notes there are many types of indexes that can be pulled based only one industry to more broad-based companies.  That said, there is flexibility.  In today’s world of mergers and acquisitions the OIC reports that securities can be dropped if necessary.

“After the recent recovery from the stock market meltdown, index products provide many investors with diversified exposure and reduced risk from a concentration in one particular security,” explains Oleg Rud, President of Imperial Advance, a financial services firm in New York that offers working capital and business loans to small and mid-size businesses.

Other Types

An index can also be a simple average: calculated by simply adding up the prices of the securities in the index and dividing by the number of securities, disregarding numbers of shares outstanding. Another type measures daily percentage movements of prices by averaging the percentage price changes of all securities included in the index.

Adjustments & Accuracy

Securities may be dropped from an index because of events such as mergers and liquidations or because a particular security is no longer thought to be representative of the types of stocks constituting the index. Securities may also be added to an index from time to time. Adjustments to indexes might be made because of such substitutions or due to the issuance of new stock by a component security. Such adjustments and other similar changes are within the discretion of the publisher of the index and will not ordinarily cause any adjustment in the terms of outstanding index options. However, an adjustment panel has authority to make adjustments if the publisher of the underlying index makes a change in the index's composition or method of calculation that, in the panel's determination, may cause significant discontinuity in the index level.

Finally, an equity index will be accurate only to the extent that:

the component securities in the index are being traded

the prices of these securities are being promptly reported

the market prices of these securities, as measured by the index, reflect price movements in the relevant markets

By Boris Dzhingarov

© 2015 Copyright Boris Dzhingarov - All Rights Reserved
Disclaimer: The above is a matter of opinion provided for general information purposes only and is not intended as investment advice. Information and analysis above are derived from sources and utilising methods believed to be reliable, but we cannot accept responsibility for any losses you may incur as a result of this analysis. Individuals should consult with their personal financial advisors.


© 2005-2019 http://www.MarketOracle.co.uk - The Market Oracle is a FREE Daily Financial Markets Analysis & Forecasting online publication.


Post Comment

Only logged in users are allowed to post comments. Register/ Log in

6 Critical Money Making Rules