Companies added to Germany’s DAX index have historically underperformed the broader market after inclusion, according to a Deutsche Bank analysis covering two decades of index changes.
The review, based on 41 new entrants since 2000, found that stocks typically rallied ahead of joining the blue-chip index but reversed course afterward. Median performance showed new members underperforming the DAX by 8% in their first year as constituents, with only 39% beating the index during that period. On rebalance day itself, new additions trailed the index by 2% on average, while stocks exiting the index outperformed by the same margin.
Deutsche Bank analysts noted that the pre-inclusion rally often sets unrealistic expectations. "DAX inclusion is not as beneficial for stock price performance as one might expect," the report stated. "As companies tend to rally ahead of index inclusion, their shares tend to underperform once index inclusion is achieved."
Liquidity effects were more favorable for entrants, with trading volumes rising by a median 15% for new members. Conversely, companies dropped from the DAX saw their trading volumes decline by 15% on average. The analysis also highlighted that excluded firms had already underperformed by 33% in the year prior to removal and continued to lag by 14% in the year following their exit.
The findings come ahead of STOXX’s scheduled review of the DAX on September 3, with changes to take effect on September 21. The review follows the August 31 cut-off date for share price movements determining inclusion outcomes. Deutsche Bank’s Carolin Raab, who contributed to the analysis, emphasized that index membership alone does not guarantee sustained outperformance.
While liquidity improvements may benefit some constituents, the data suggests that DAX inclusion is not a reliable driver of long-term stock gains.
