The table below lists the historical components of S&P 500 index for the past eight years. If a company was part of the index during the last day of a year, it is marked as X. Export the list to Excel to examine how the index constituents have been changing.
Note: Unfortunately, we are not allowed to puclicly publish the list of historical index components anymore. However, the datasets provided by Siblis Research are still available and updated quarterly.
Purchase a dataset that lists all the changes to the index constituents since 1970/1990/2000, including a summary sheet that allows you to quickly check the components for any date. The dataset includes exact change dates, ISIN codes, ticker symbols and GICS Sector & Industry classifications of all the companies. Full refund guaranteed if you are not fully satisfied with the data for any reason. Check a sample dataset from here.
For key historical data of the index companies, purchase the S&P 500 Researcher Dataset by Siblis Research which includes quarterly earnings, share prices, outstanding shares, market caps, enterprise values, P/B & P/E ratios, EV/EBITDA multiples and adjusted prices (total returns) & component weights of all current and past S&P 500 companies since 3/31/1979, including component changes since 1963. Examine what the dataset looks like.
S&P 500 Change History
The component changes datasets provided here are created based on the index research conducted by Siblis Research. If you are planning to collect the data by yourself, one place to start is the announcement archive of S&P Dow Jones. Tracking the historical changes can be challenging because the names and tickers of corporations keep constantly changing. Extra attention is needed especially with mergers and acquisitions.
For example the original BankAmerica (BAC) was added to S&P 500 in July 1976. But the current Bank of America (BAC) has its roots in NationsBank that acquired the original BAC in 1998. In the component changes dataset, the original bank is marked as “BAC (Old)” to separate it from the new corporation.
Financial industry has been especially prune for mergers and adopting new company names. When First Union acquired Wachovia National Bank in September 2001, First Union was the nominal survivor but the bank decided to still to select Wachovia Corporation as their name.
One of the trickiest cases is probably the intervening history of Citigroup and The Travelers Companies. The original Travelers went through a series of mergers in the 1990s and finally merged with Citicorp to become Citigroup in 1998. Travelers Group was the nominal survivor and Citicorp Inc. (CCI) was deleted from the index in October 7th 1998. The merger was a disappointment for all the parties and Travelers was spun off as a separate entity a few years later. The new Travelers become part of S&P 500 under the name of Travelers Property Casualty (TAP.B) on August 20th 2002.
The company was then bought by St. Paul Insurance in 2004 to form St. Paul Travelers but soon the Saint Paul was dropped from the name and the corporation become just Travelers Companies (TRV). TAP.B was removed from S&P 500 on April 1st 2014. The company now operating under Citigroup name was trading under TRV ticker (the current symbol of Travelers) between 1994 and 1998 so it is easy to mix up the stock histories of the companies.
Changes to S&P 500 composition during 2015
During 2015, S&P Dow Jones Indices replaced 24 companies. In addition to component changes, also additional shares classed from Comcast, 21st Century Fox and News Corp were added, making the total number of components to be 505 during September. The CMCSK share class of Comcast was removed in December when Comcast merged this share line with CMCSA class and the number of constituents was decreased to 504. On the list below, the added company is bolded and removed firm is in italics.
- January: Endo International (ENDP), HCA Holdings (HCA). Covidien (COV). Safeway (SWY).
- March: Skyworks Solutions (SWKS), Henry Schein (HSIC), Equinix (EQIX), SL Green Realty (SLG), Hanesbrands (HBI), American Airlines Group (AAL). PetSmart (PETM), CareFusion (CFN), Denbury Resources (DNR), Nabors Industries (NBR), Avon Products (AVP), Allergan (AGN).
- April: Realty Income (O). Windstream Holdings (WIM)
- June: Qorvo (QRVO). Lorillard (LO).
- July: Baxalta (BXLT), J. B. Hunt Transport Services (JBHT), Columbia Pipeline Group (CPGX), Advance Auto Parts (AAP), PayPal (PYPL), Signet Jewelers (SIG). QEP Resources (QEP), Integrys Energy Group (TEG), Allegheny Technologies (ATI), Family Dollar Stores (FDO), Noble Corp (NE), DirecTV (DTV).
- August: Activision Blizzard (ATVI). Pall Corp (PLL).
- September: United Continental Holdings (UAL). Hospira Inc (HSP)
- October: Verisk Analytics (VRSK). Joy Global (JOY)
- November: Hewlett Packard Enterprise (HPE), Synchrony Financial (SYF), Illumina Inc (ILMN). Hudson City Bancorp Inc (HCBK), Genworth Financial Inc. (GNW), Sigma-Aldrich Corp. (SIAL).
- December: CSRA Inc (CSRA), Church & Dwight Co (CHD). Computer Sciences Corp. (CSC), Altera Corp. (ALTR).
Changes to the index components during 2014
During 2014, there were 15 changes to the index. These companies were added to the index: Royal Caribbean Cruises Ltd (RCL), Level 3 Communications (LVLT), United Rentals (URI), Universal Health Services (UHS), Mallinckrodt (MNK), Discovery Communications (DISCK, additional stock class), Martin Marietta Materials (MLM), Affiliated Managers Group (AMG), Cimarex Energy (XEC), Avago Technologies (AVGO), Under Armour (UA), Navient (NAVI), Google (GOOGL, additional stock class), Essex Property Trust (ESS), Keurig Green Mountain (GMCR) and Tractor Supply Company (TSCO). These companies were removed from the index: Bemis Company (BMS), Jabil Circuit (JBL), Peabody Energy (BTU), Graham Holdings (GHC), Rowan Companies (RDC), United States Steel Corporation (X), Forest Laboratories (FRX), International Game Technology (IGT), LSI Corporation (LSI), Beam Inc. (BEAM), SLM Corporation (SLM), Cliffs Natural Resources (CLF), WPX Energy (WPX) and Life Technologies (LIFE).
Standard & Poor’s 500 stock index includes 500 large companies (not the largest, there are also other criteria than market cap) that are listed on the NYSE or NASDAQ. The index has currently 504 constituents: Alphabet (GOOG & GOOGL), Discovery Communications (DISCA & DISCK), Twenty-First Century Fox (FOXA & FOX) and News Corp. (NWSA & NWS) each have two different share classes part of the index.
On February 2014, S&P Dow Jones announced that Google’s new share Class C will replace the old Class A. However, one month later S&P cancelled their previous announcement and said that both Classes shall be included to SP’s US indexes. Soon another stock line from Discovery Communications was also included and the total number of constituents at the end of 2014 was 502.
Under the new guidelines, all eligible stock classes for a company that meet certain liquidity and materiality thresholds will be included in the index. Before S&P Dow Jones changed their rules for additional stock classes, the weight of a component was calculated using the total shares outstanding (float-adjusted) as the share count and the price of the most liquid share class as stock price. Under the current system, each share class line is assigned a weight that is proportional to its float-adjusted market capitalization.
On September 2015, additional stock classes from Comcast, Twenty-First Century Fox and News Corp. were added. There are still ten companies currently part of S&P 500 with additional stock classes that have only one share line part in the index. These stock classes have not fulfilled the addition criteria. S&P Dow Jones has particularly stated that Berkshire Hathaway (BRK.B) will have only its Class B share included to its indexes.
S&P has justified the change by stating that “Multiple share classes are becoming more common among US corporations, especially in the technology sector. Were the trend ignored, some indices would have difficulty properly representing major market segments while providing sufficient liquidity to accommodate trading and necessary index adjustments.”
How often has the S&P 500 index composition changed?
Between 1/1/1963 and 12/31/2014, 1,186 components have been replaced with another stocks. For the past 51 years, the average number of component changes has been 23 per year. During 1976, Standard & Poor’s made major changes to the rules of S&P 500 and 60 companies were replaced. Before this year, there were no financial companies included. A lot of component shuffling was happening during the dot-com boom at the end of 1990s. The bubble started to burst in 2000 and 56 companies were swapped this year. The slowest year was 1992 when only 7 corporations were replaced. The most common reason why components are replaced is mergers and acquisitions. Companies can also be deleted if they are violating the addition criteria of the index, the most important being sufficient market value.
How are the components selected and the index value calculated?
S&P 500 index includes 500 large companies listed on the NYSE or NASDAQ stock exchanges. Together with Dow Jones Industrial Average Index, the index is the most followed gauge for measuring the performance of US stock market and US economy as a whole. The index is maintained by S&P Dow Jones Indices that decides the constituents and manages their weights. In order to be included, a company must have a market value over US$5.3 billion and monthly trading volume of the company’s shares must be at least 250,000.
The value of the index is calculated by dividing the sum of the adjusted (free-float) market cap of all the components by the index divisor. The value of the divisor does not stay the same but is altered when components are changing or some corporate actions are affecting the market value of the current constituents. On August 2015, the total market cap of the index was $18,521,637,24 million. Download the latest official fact sheet for S&P 500 from here.
Does addition to S&P 500 index increase the stock value of a company?
Many studies have concluded that an addition to the S&P 500 index has a positive impact for a company’s share price. For example, Anthony W. Lynch from New York University and Richard R. Mendenha from University of Notre Dame have proved a positive abnormal return for shares added to the index of about 3.8% over the period starting the day after the announcement and ending the day before the effective date of the change. Their data also shows that deletion from the index causes significant post-announcement decrease in stock prices. Several explanations for this positive price effect have been suggested. Petya Platikanova from Ramon Llull University has suggested that discretionary accruals (non-obligatory expense, e.g. future bonus for management, that is yet to be realized but is already recorded in the account books) significantly decrease after companies are added to the index, which greatly improves earnings quality.