Changes to the Index Rules of SIX Swiss Exchange into force as of 1 July 2011

Zürich, (PresseBox) - The Management Committee of SIX Swiss Exchange has, at the recommendation of the Index Commission, decided to revise the rules governing the SMI and SPI Index Families as well as those for the SLI Swiss Leader Index. The amendments take into account the changed market environment and ensure the acceptance and quality of the Swiss blue chip and benchmark indices. The revised Index Rules will enter into force on 1 July 2011.

With this revision of the Index Rules it can be ensured that large-cap companies, whose shares have a primary listing on several exchanges and less than 50% of their total turnover is generated on SIX Swiss Exchange, have sufficient liquidity to qualify for acceptance into the blue chip indices SMI, SMI Mid and SLI Swiss Leader Index.

At the same time, the size allocation (Small, Mid, Large) for the sub-indices of the SPI Family will now be determined exclusively on the basis of market capitalization. This prevents large-cap companies, which otherwise do not fulfill the liquidity criteria for acceptance in the SMI, from being allocated to the Mid Cap Segment and hence included in the SPI EXTRA®.

The revised Index Rules will enter into force on 1 July 2011 and form the basis for any index adjustments made in connection with the ordinary index review in September 2011.

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SIX Swiss Exchange is one of the world's leading and most technologically advanced securities exchanges. It provides customers with first-rate securities exchange services and brings together participants, issuers and investors in an efficient and transparent marketplace. In addition to the broad palette of products it offers, the SIX Swiss Exchange's integrated, fully automatic trading, clearing and settlement system is indeed convincing.

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SIX Swiss Exchange is a subsidiary of SIX Group. On a worldwide scale, SIX Group offers first-rate services in the areas of securities trading, clearing and settlement, as well as financial market information and payment transactions.

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