More recent changes to the index include the following:. In addition to these basic interpretations, three signal pairings have evolved over the years decades.
These include buywrite indices, volatility indices, and put-call ratios. There are also some continuous contract commodity prices with long price histories. Dow Jones Global Indices An index series that features world stock indices, geographic regions, country indices, global sectors and more. Dow Jones Select Indices An index series that limits the weightings of its components to ensure diversity.
Dow Jones Titans Indices An index series that measures the performance of the largest components within a group. Dow Jones US Indices An index series that breaks the market down into broad stock indices, style indices, industry indices and sector indices. Economic Indicators A selection of economic indicators with weekly or monthly data. The new methodology allowed NASDAQ to reduce the influence of the largest companies and to allow for more diversification.
However, the weights of the stocks were not changed after that, which led to more problems. In addition to its lack of financial companies, the Nasdaq includes 12 stocks of 11 companies incorporated outside the United States. As of November , the Nasdaq has companies incorporated in the following foreign countries:. With some exceptions, most stocks that are added to the index come up through the Q The latter index includes noted E-commerce companies Amazon. This table is current as of the close of trading on December 24, An up-to-date list is available in the External links section.
As of December , companies have been components of the index. Of these, only four, Apple, Costco through its merger in with Price Club , with Costco, as a separate entity, not becoming a component until at least , Intel and PACCAR, have been components, continuously, since the first dissemination of the index in Two other current components, KLA-Tencor and Micron Technology, were also components when the index started, but were removed from the index over time for various reasons.
A number of companies were replaced in , with all the replacements taking place before the market opened that day. Hunt Transport Services , and Warner Chilcott.
On January 20, , News Corporation was added to the index, replacing Focus Media Holding , which did not meet the minimum monthly weight requirements.
On October 29, , Priceline. Hunt , Logitech and Patterson Companies. These were the only changes made to the index that year and the fewest since On April 4, , Alexion Pharmaceuticals replaced Genzyme before the market open. Perrigo had been a member of the index in the s, being dropped in They were Avago Technologies , Fossil, Inc.
On May 30, , Viacom became a component of the index prior to the market open. On July 23, , Kraft Foods, Inc. On Wednesday December 12, , Facebook Inc. Prior to the market open on Monday, December 24, , 20 changes to the index took place.
On January 15, , Starz Inc. This meant the index had components. Later in , additional classes of stock from other index companies were added to the index, bringing the number of constituent securities in the index to A number of changes took place in On July 1, Liberty Interactive created two new tracking stocks, tracking the company's interests in Latin America.
Both tracking stocks were added to the index the same day. Catamaran Corporation was removed from the index after the close of trading on July 23, after going private. Skyworks Solutions took Sigma-Aldrich's place at the start of trading August 3. Altera was removed on October 7 as a result of its merger with Intel. Incyte replaced Altera's on that date. With the current inclusion of only 30 stocks, critics such as Ric Edelman argue that the DJIA is not a very accurate representation of overall market performance.
Still, it is the most cited and most widely recognized of the stock market indices. As of July , Boeing and Goldman Sachs are among the highest priced stocks in the average and therefore have the greatest influence on it.
Alternately, Pfizer and Cisco Systems are among the lowest priced stocks in the average and have the least amount of sway in the price movement. A study between the correlation of components of the Dow Jones Industrial Average compared with the movement of the index finds that the correlation is higher in a time period where the average recedes and goes down. The correlation is lowest in a time when the average is flat or rises a modest amount.
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