General MDAX Development
The MDAX, the German index for medium-sized companies, showed volatile development in May 2025. Since the beginning of the year, the index has risen significantly – according to current information, by around 19 percent to about 30,967 points. However, the monthly performance of individual stocks varied greatly.
Top and Flop Stocks in May 2025
The following overview is based on the Xetra price values between April 30, 2025, and May 30, 2025:
| Rank | Company | Performance (May) |
|---|---|---|
| 51 (Flops start from this rank) | – | – |
| 50 | TeamViewer | -23.83 % |
| 49 | freenet | -20.63 % |
| 48 | thyssenkrupp | -14.35 % |
| 47 | Redcare Pharmacy | -12.74 % |
| 46 (Example of another flop) | RTL | -6.25 % |
Note: The complete list of all ranks is not fully represented in the source; here, only the biggest losers are mentioned as examples.
Interpretation of Results
TeamViewer: With a decline of almost 24 percent, TeamViewer was one of the biggest losers of the month.
freenet: freenet also recorded a significant decline of over 20 percent.
thyssenkrupp: Despite a strong performance during the year, thyssenkrupp fell by more than 14 percent in May.
Redcare Pharmacy: Also a significant decline of just under 13 percent.
Other stocks like RTL also showed negative developments.
For private investors, this means: While some stocks may perform strongly in the long term (e.g., thyssenkrupp with an increase of over 120 percent since the beginning of the year according to another ranking), short-term fluctuations can be significant.
Importance for Small Investors
- Risk Management: Identifying particularly volatile or declining stocks helps with risk diversification.
- Stock Selection: Knowledge of strong winners or losers can serve as a decision-making aid for future investments.
- Market Sentiment: Significant price declines like those of TeamViewer or freenet indicate industry problems or specific company news.
Conclusion
Although the MDAX developed positively in May – especially since the beginning of the year – individual stocks suffered from significant losses. Therefore, it is advisable for private investors to consider both long-term trends and short-term fluctuations and to diversify their portfolio accordingly.