The OMX Stockholm 30 (OMXS30) is a stock market index for the Stockholm Stock Exchange. It is a market value-weighted index that consists of the 30 most-traded stock classes.

As of the semi-annual reshuffle of 1 July 2009 the index is composed of the following listings (its composition was left unchanged in both semi-annual reviews in 2010 and 2011):

Stockholm (Swedish pronunciation: [ˈstɔkːˈhɔlm, ˈstɔkːˈɔlm, ˈstɔkːɔlm]( listen to the second one)) is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 864,324 in the municipality (2010), 1.4 million in the urban area (2010), and around 2.1 million in the 6,519 km² (2,517.00 sq mi) metropolitan area (2010). As of 2010, the Stockholm metropolitan area is home to approximately 22% of Sweden's population.

Founded no later than c. 1250, possibly as early as 1187, Stockholm has long been one of Sweden's cultural, media, political, and economic centres. Its strategic location on 14 islands on the south-central east coast of Sweden at the mouth of Lake Mälaren, by the Stockholm archipelago, has been historically important. Stockholm has been nominated by GaWC as a global city, with a ranking of Alpha-. In The 2008 Global Cities Index, Stockholm ranked 24th in the world, 10th in Europe, and first in Scandinavia. Stockholm is known for its beauty, its buildings and architecture, its abundant clean and open water, and its many parks. It is sometimes referred to as Venice of the North.