TOPIX

Tokyo Stock Price Index (東証株価指数), commonly known as TOPIX, along with the Nikkei 225, is an important stock market index for the Tokyo Stock Exchange (TSE) in Japan, tracking all domestic companies of the exchange's First Section. It is calculated and published by the TSE. As of 1 February 2011, there are 1,669 companies listed on the First Section of the TSE, and the market value for the index was ¥197.4 trillion.

The index transitioned from a system where a company's weighting is based on the total number of shares outstanding to a weighting based on the number of shares available for trading (called the free float). This transition took place in three phases starting in October 2005 and was completed in June 2006. Although the change is a technicality, it had a significant effect on the weighting of many companies in the index, because many companies in Japan have significant holdings of shares of their business partners as a part of intricate business alliances, and such shares are no longer included in calculating the weight of companies in the index.

Topix (website)

Topix is an American internet news media company. Topix LLC, the controlling company, has its headquarters in Palo Alto, California.

Topix began as a news aggregator which categorizes news stories by topic and geography. "Topix.net" as it was originally known as, was created by Bryn Dole, Rich Skrenta, Bob Truel, Tom Markson, Mike Markson and Chris Tolles, many of whom founded the Open Directory Project. In March 2005, the Knight Ridder (later taken over by The McClatchy Company), Tribune Company and Gannett media companies purchased a 75% share of the company. On April 1, 2007, it acquired the topix.com domain name and invited volunteers to edit the topics of their choice, on top of over 100 journalists and editors from various newspapers already signed up. Sometime in 2012 they took that volunteer edit option away without any communication to the thousands of volunteers.

Topix went on to create a community news editing platform, and popular forum system, allowing users to comment on news articles and the goings on of local communities. Topix also created forums, organized by locality as well as by subject matter, which allow visitors to post comments whether or not they are relevant to a particular news story.