A shake-up in the MDax: the small cap index will have three new members in just under three weeks.

The travel group TUI, the commercial kitchen equipment supplier Rational and the truck manufacturer Traton will join the index of the 50 most important stocks below the Dax on June 24, as announced by Deutsche Börse on Wednesday evening. The solar supplier SMA Solar, the biotech group Morphosys and the car rental company Sixt will be relegated to the small-cap index SDax.

The only real climber from the SDax is MAN and Scania parent company Traton. TUI only returned to the Frankfurt market from the London Stock Exchange in the spring, while Rational was excluded from the Dax indices in March due to a breach of the principles of good corporate governance. The Chairman of the Audit Committee on the Supervisory Board was not considered independent as required, but Rational has since changed the composition of the committee. Morphosys is about to be taken over by the Swiss pharmaceutical giant Novartis, which is why the free float is only sufficient for a place in the SDax.

There, the three relegated companies displace the insurance and building society group W&W, the plant engineering company Heidelberger Druck and the ThyssenKrupp hydrogen subsidiary Nucera, which went public last year and was immediately promoted to the index. After Renk, the second newcomer to the stock market this year is also moving into the SDax: the perfumery chain Douglas is the only real newcomer there. The defense supplier Renk had already moved up into the index in May.

(Report by Alexander Hübner, edited by Ralf Bode. If you have any questions, please contact our editorial team at berlin.newsroom@thomsonreuters.com (for politics and the economy) or frankfurt.newsroom@thomsonreuters.com (for companies and markets).