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The Anatomy of an Index Thumbnail

The Anatomy of an Index


About the author: Lamar Watson, CFP®, is a Fee-Only Financial Advisor in the Washington, D.C. area that works with clients virtually across the country. Lamar's work with his clients starts with a focus on budgeting, insurance, optimizing employee benefits, investing, and retirement planning. Dream Financial Planning is a Fiduciary Financial Planning firm specifically designed to help individuals in their 30s and 40s take control of their finances and fulfill their dreams. Feel free to schedule a complimentary consultation to learn how we use the DREAM Financial Planning Process ™ to help our clients achieve their goals. 


Did you know that an estimated $13.5 trillion in assets are indexed or benchmarked to the Standard & Poor’s 500 Composite Index, including $5.4 trillion in index assets?1

The S&P 500 is ubiquitous – we see it on the news, read about it in the newspapers, and very likely, see some of our own investments’ performance compared to it. For an index that represents approximately 80% of the value of the U.S. equity market, it may be worthwhile to gain a better understanding of how it works.1

Cap & Criteria

The index, as we know it today, was introduced in 1957 and is maintained by the Standard & Poor’s Index Committee. Contrary to popular belief, it is not comprised of the 500 largest companies in America but is a collection of large-cap stocks representing a broad range of market sectors, including technology, energy, health care, and consumer staples among others.2

There are a number of criteria a company must meet to be considered for inclusion in the index. Some of these criteria include the following: it must be a U.S. company, have an unadjusted market capitalization of $14.6 billion or more, have 50% of its stock available to the public and have four consecutive quarters of positive earnings.2

Changes Over Time

Another common misconception is that the index is a static one. In fact, companies will be removed, from time to time, for reasons that include violation of one or more of the criteria used for adding companies or because of a merger, acquisition or significant restructuring, including bankruptcy.

The turnover in the index’s constituent companies was 3.6% in 2020 (per the most recent data available). According to one projection, the average tenure of companies in the index is expected to fall to 15-20 years this decade, as compared to the 30-35 year average tenure in the late 1970s.3

Add and Subtract

When changes are made to the index, many mutual funds and exchange-traded funds that seek to replicate the index may have to sell stocks that are being removed and buy the stocks that are being added in order to track the index. Keep in mind that amounts in mutual funds and ETFs are subject to fluctuation in value and market risk. Shares, when redeemed, may be worth more or less than their original cost.

Mutual funds and exchange-traded funds are sold only by prospectus. Please consider the charges, risks, expenses and investment objectives carefully before investing. A prospectus containing this and other information about the investment company can be obtained from your financial professional. Read it carefully before you invest or send money. 

Investors cannot invest in an index. Also, index performance is not indicative of the past performance of a particular investment, and past performance does not guarantee future results. Investment choices designed to replicate any index may not perfectly track it, and their returns will be reduced by fees and expenses.

Dream Financial Planning Process ™

Whether you're managing student loan debt, starting a family, or considering buying your first home, the DREAM Financial Planning Process™ is tailored to the unique needs of busy professionals in their 30s and 40s. This process focuses more on short-term goals while you grow and evolve in your personal and professional life. So if you're looking for guidance on Financial Planning, optimizing employee benefits, budgeting, student loans, and managing your 401k or investments, we can help.

Complimentary Consultation

With uncertainty surrounding the economic stability of our country, it's okay to have fears and anxieties surrounding your savings and investments. The most productive course of action from here is to reach out to Dream Financial Planning (or whoever your trusted advisor might be) and discuss your options. It's easy to have knee-jerk reactions when it feels like the bottom is falling out, but it is imperative to make decisions using research-backed data and a level head. If you'd like a Complimentary Review and risk assessment of your investment portfolio, feel free to send me an e-mail.

Monthly Newsletter

In the June Newsletter, I provide a market update and a PDF guide with tips to help you handle inflation. I also shared a CNN article where I shared my thoughts on Crypto and NFTs, 5 savings mistakes people make when building their financial life. If you find any of this information helpful, feel free to sign up to receive future e-mail updates. If you find any of this information helpful, feel free to sign up to receive future newsletters via e-mail.

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  1. https://www.spglobal.com/spdji/en/documents/index-news-and-announcements/spdji-indexed-asset-survey-2020.pdf
  2. https://www.investopedia.com/articles/investing/090414/sp-500-index-you-need-know.asp
  3. https://www.innosight.com/insight/creative-destruction/

Disclaimer: Dream Financial Planning, LLC does not warrant that this information will be free from error. None of the information provided on this website is intended as investment, tax, accounting, or legal advice, as an offer or solicitation of an offer to buy or sell, or as an endorsement of any company, security, fund, or other securities or non-securities offering. The information should not be relied upon for purposes of transacting securities or other investments. Your use of the information is at your sole risk. Under no circumstances shall Dream Financial Planning, LLC be liable for any direct, indirect, special, or consequential damages that result from the use of, or the inability to use, the materials in this site, even if Dream Financial Planning, LLC or a Dream Financial Planning, LLC authorized representative has been advised of the possibility of such damages. Please consult with your own advisor before making any changes to your Financial Plan, Investments, or Insurance coverage.